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diff --git a/doc/dispread.html b/doc/dispread.html new file mode 100644 index 0000000..e1ce861 --- /dev/null +++ b/doc/dispread.html @@ -0,0 +1,926 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html> + <head> + <title>dispread</title> + <meta http-equiv="content-type" content="text/html; + charset=ISO-8859-1"> + <meta name="author" content="Graeme Gill"> + </head> + <body> + <h2><b>spectro/dispread</b> </h2> + <h3>Summary</h3> + Display test patches on a monitor, read the colorimetric value + result with the colorimeter, and create the chart readings file. The + type of instrument is determined by the communication port selected. + Emission and display measurement instruments are supported.<br> + <br> + If you want to read a display manually rather than automatically, + see <a href="chartread.html">chartread</a> and the <a + href="chartread.html#d">-d</a> option.<br> + <h3>Usage</h3> + <small style="font-family: monospace;">dispread [-options]<i> + inoutfile</i><br> + <a href="#v">-v</a> + + + + + + + + + + + + + + Verbose mode<br> + </small><font size="-1"><a style="font-family: monospace;" + href="#display">-display displayname</a><span + style="font-family: monospace;"> [X11 only] Choose X11 display + name<br> + </span></font><font size="-1"><span style="font-family: + monospace;"> <a href="#dnm">-d n[,m]</a> + + [X11 only]Choose the display from the following list (default + 1),<br> + +and +optionally +choose +a +different +display +m + + + + + + + + + + + + + + for VideoLUT access.</span></font><br> + <font size="-1"><span style="font-family: monospace;"> <a + href="#d">-d n</a> +Choose +the +display +from +the +following +list + + + + + + + + + + + + + + (default 1)</span></font><small style="font-family: monospace;"><br> + </small><span style="font-family: monospace;"> <a href="#dweb">-dweb[:port]</a> + + + + + + + + + + + + + + + + Display via a web server at port (default 8080)</span><br> + <small style="font-family: monospace;"> <span style="font-family: + monospace;"> </span><a style="font-family: monospace;" + href="#c">-c listno</a><span style="font-family: monospace;"> + Set + communication port from the following list (default 1)<br> + </span></small><font size="-1"><span style="font-family: + monospace;"> <a href="#p">-p</a> + + + + + + + + + + + + + + Use telephoto mode (ie. for a projector) (if available)</span></font><br> + <font size="-1"><span style="font-family: monospace;"><a + href="#y">-y X</a> + +Display + + + + + + + + + + + + + + + type - instrument specific list to choose from.</span></font><br> + <small style="font-family: monospace;"> <span + style="text-decoration: underline;">-</span><a href="#k">k + file.cal</a> + + + + + + + + + + + + + + Load calibration file into display while reading<br> + </small><small style="font-family: monospace;"> <span + style="text-decoration: underline;">-</span><a href="#K">K + file.cal</a> +Apply + + + + + + + + + + + + + + calibration file to test values while reading</small><br> + <small style="font-family: monospace;"> <a href="#s">-s</a> + + + + + + + + + + + + + + Save spectral information (default don't + save)<br> + </small><font style="font-family: monospace;" size="-1"> <a + href="#P">-P ho,vo,ss[,vs]</a> Position + test window and scale it<br> + +ho,vi: +0.0 += +left/top, +0.5 += +center, + + + + + + + + + + + + + + 1.0 = right/bottom etc.<br> + +ss: +0.5 += +half, +1.0 += +normal, + + + + + + + + + + + + + + 2.0 = double etc.<br> + </font><font size="-1"><span style="font-family: monospace;"> + + + + + + + ss,vs: = optional horizontal, vertical scale.</span></font><br> + <font style="font-family: monospace;" size="-1"> </font><font + size="-1"><span style="font-family: monospace;"><a href="#F">-F</a> + + + + + + + + + + + + + + + Fill whole screen with black background</span></font><br + style="font-family: monospace;"> + <small style="font-family: monospace;"> <span + style="text-decoration: underline;"></span><a href="#n">-n</a> + +[X11 +only] +Don't +set +override +redirect + + + + + + + + + + + + + + on test window<br> + </small><small style="font-family: monospace;"> <a href="#J">-J</a> + + + + + + + + + + + + + + + Run calibration first</small><br> + <font size="-1"><span style="font-family: monospace;"> <a + href="#N">-N</a> + + + + + + + + + + + + + + Disable initial calibration of instrument if possible<br> + </span></font><font size="-1"><span style="font-family: + monospace;"> </span><a style="font-family: monospace;" + href="#H">-H</a><span style="font-family: monospace;"> + + Use high resolution spectrum mode (if + available)</span></font><font size="-1"><span + style="font-family: monospace;"></span><span style="font-family: + monospace;"><br> + <a href="#w">-w</a> + +Disable +normalisation +of +white +to +Y += + + + + + + + + + + + + + + 100</span></font><small><span style="font-family: monospace;"></span></small><br> + <font size="-1"><span style="font-family: monospace;"><a + href="#X1">-X file.ccmx</a> + + + + + + + + + + + + + + Apply Colorimeter Correction Matrix</span></font><br> + <span style="font-family: monospace;"> <a href="#X2">-X + file.ccss</a> +Use +Colorimeter +Calibration + + + + + + + + + + + + + + Spectral Samples for calibration</span><font size="-1"><span + style="font-family: monospace;"><br> + </span></font><small><span style="font-family: monospace;"> </span><a + style="font-family: monospace;" href="#Q">-Q <i>observ</i></a><span + style="font-family: monospace;"> + Choose CIE Observer for spectrometer or CCSS + colorimeter data:</span><br style="font-family: monospace;"> + <span style="font-family: monospace;"> + + + + + + + + + + + + + + 1931_2 </span></small><small><span + style="font-family: monospace;">(def.)</span></small><small><span + style="font-family: monospace;">, 1964_10, S&B 1955_2, shaw, + J&V 1978_2, 1964_10c</span></small><br> + <small><span style="font-family: monospace;"> <a + href="dispread.html#I">-I b|w</a> +Drift +compensation, +Black: +-Ib, +White: +-Iw, +Both: + + + + + + + + + + + + + + -Ibw<br> + </span></small><font size="-1"><span style="font-family: + monospace;"> </span><a style=" font-family: monospace;" + href="#YA">-<font size="-1">Y</font> A</a><span + style="font-family: monospace;"> + + + + + + Use non-adaptive integration time mode (if available).</span></font><br> + <font size="-1"><span style="font-family: monospace;"> </span><a + style="font-family: monospace;" href="#C">-C "command"</a><span + style="font-family: monospace;"> + Invoke shell + "command" each time a color is set<br> + </span></font><font size="-1"><span style="font-family: + monospace;"> </span><a style="font-family: monospace;" + href="#M">-M "command"</a><span style="font-family: monospace;"> + Invoke shell + "command" each time a color is measured</span></font><br> + <font size="-1"><span style="font-family: monospace;"> <a + href="#W">-W n|h|x</a> +Override +serial +port +flow +control: +n += + + + + + + + + + + + + + + none, h = HW, x = Xon/Xoff</span></font><br> + <small style="font-family: monospace;"> <a href="#D">-D [level]</a> + Print debug + diagnostics to stderr</small><br> + <small style="font-family: monospace;"> <a href="#p1"><i>inoutfile</i></a> + + + + + + + + + + + + + + Base name for input[<a href="File_Formats.html#.ti1">.ti1</a>]/output[<a + href="File_Formats.html#.ti3">.ti3</a>] file.<br> + </small> <br> + <b>Examples</b><br> + <br> + dispread -c1 -i92 mycrt<br> + <h3>Comments<br> + </h3> + This is the tool for exercising a display, in order to measure its + color characteristics. The device test colors are defined by the + outfile.ti1 file, while the resulting device+colorimetric and + optional spectral readings are stored in the outfile.ti3 file. + Display calibration curves can be applied during the measurements, + and the curves included in the resulting .ti3 data file using the <span + style="font-weight: bold;">-k</span>flag. See <a + href="dispcal.html">dispcal</a> for information on how to + calibrate the display before profiling it. For best results, you + should run this against a neutral grey desktop background, and avoid + having any bright images or windows on the screen at the time you + run it.<br> + <br> + <a name="v"></a> The <b>-v</b> flag reports progress information.<br> + <br> + <a name="display"></a><span style="font-weight: bold;">-display</span>: + When running on a UNIX based system that used the X11 Windowing + System, <b>dispread</b> will by default use the $DISPLAY + environment variable to determine which display and screen to read + from. This can be overridden by supplying an X11 display name to the + <span style="font-weight: bold;">-display</span> option. Note that + if Xinerama is active, you can't select the screen using $DISPLAY or + -display, you have to select it using the <span style="font-weight: + bold;">-d</span> parameter.<br> + <br> + <a name="d"></a> <span style="font-weight: bold;">-d</span>: By + default the main display will be the location of the test window. If + the system has more than one display or screen, an alternate + display/screen can be selected with the <span style="font-weight: + bold;">-d</span> parameter. If you invoke <span + style="font-weight: bold;">dispread</span> so as to display the + usage information (i.e. "dispread -?" or "dispread --"), then the + discovered displays/screens will be listed. Multiple displays may + not be listed, if they appear as a single display to the operating + system (ie. the multi-display support is hidden in the video card + driver). On UNIX based system that used the X11 Windowing System, + the <span style="font-weight: bold;">-d</span> parameter will + override the screen specified by the $DISPLAY or <span + style="font-weight: bold;">-display</span> parameter.<br> + <br> + On X11 the inability to access VideoLUTs could be because you are + trying to access a remote display, and the remote display doesn't + support the XF86VidMode extension, or perhaps you are running + multiple monitors using NVidia TwinView, or MergedFB, and trying to + access anything other than the primary monitor. TwinView and + MergedFB don't properly support the XF86VidMode extension for + multiple displays. You can use <a href="dispwin.html#r">dispwin -r</a> + to test whether the VideoLUTs are accessible for a particular + display. See also below, on how to select a different display for + VideoLUT access. Also note that dispcal will fail if the Visual + depth doesn't match the VideoLUT depth. Typically the VideoLUTs have + 256 entries per color component, so the Visual generally needs to be + 24 bits, 8 bits per color component.<br> + <br> + <a name="dnm"></a>Because of the difficulty cause by TwinView and + MergedFB in X11 based systems, you can optionally specify a separate + display number after the display that is going to be used to present + test patches, for accessing the VideoLUT hardware. This must be + specified as a single string, e.g. <span style="font-weight: bold;">-d + + + + + + + + + + + + + + 1,2</span> . Some experimentation may be needed using <a + href="dispwin.html">dispwin</a> on such systems, to discover what + screen has access to the VideoLUT hardware, and which screens the + test patches appear on. You may be able to calibrate one screen, and + then share the calibration with another screen. Profiling can be + done independently to calibration.<br> + <br> + <a name="dweb"></a><span style="font-weight: bold;">-dweb</span> or + <span style="font-weight: bold;">-dweb:port</span> starts a + standalone web server on your machine, which then allows a local or + remote web browser to display the the color test patches. By default + port <span style="font-weight: bold;">8080</span> is used, but this + can be overridden by appending a <span style="font-weight: bold;">:</span> + and the port number i.e. <span style="font-weight: bold;">-dweb:8001</span>. + The URL will be <span style="font-weight: bold;">http://</span> + then name of the machine or its I.P. address followed by a colon and + the port number - e.g something like <span style="font-weight: + bold;">http://192.168.0.1:8080</span>. If you use the verbose + option (<span style="font-weight: bold;">-v</span>) then a likely + URL will be printed once the server is started, or you could run <span + style="font-weight: bold;">ipconfig</span> (MSWin) or <span + style="font-weight: bold;">/sbin/ifconfig</span> (Linux or OS X) + and identify an internet address for your machine that way. + <b> JavaScript</b> needs to be enabled in your web browser for this + to work.<br> + <br> + Note that if you use this method of displaying test patches, that + there is no access to the display VideoLUTs and that the colors will + be displayed with 8 bit per component precision, and any + screen-saver or power-saver will not be disabled. You will also be + at the mercy of any color management applied by the web browser, and + may have to carefully review and configure such color management. + See the <a href="dispcal.html#o">-o</a> flag for an explanation of + the implications of having no access to the VideoLUTs.<br> + <br> + <a name="c"></a> <span style="font-weight: bold;">-c</span>: The + instrument is assumed to communicate through a USB or serial + communication port, and the port can be selected with the <b>-c</b> + option, if the instrument is not connected to the first port. If you + invoke <span style="font-weight: bold;">dispread</span> so as to + display the usage information (i.e. "dispread -?" or "dispread --"), + then the discovered USB and serial ports will be listed. On + UNIX/Linux, a list of all possible serial ports are shown, but not + all of them may actually be present on your system.<br> + <br> + <a name="p"></a>The <span style="font-weight: bold;">-p</span> flag + allows measuring in telephoto mode, using instruments that support + this mode, e.g. the ColorMunki. Telephoto mode is one for taking + emissive measurements from a distance (ie. telespectometer, + tele-colorimeter) mode, and typically would be used for measuring + projector type displays. If a device does not support a specific + telephoto mode, then the normal emissive mode may be suitable for + measuring projectors.<br> + <br> + <a name="y"></a>The <span style="font-weight: bold;">-y</span> flag + allows setting the Display Type. The selection typically determines + two aspects of of the instrument operation: <span + style="font-weight: bold;">1)</span> It may set the measuring mode + to suite <a + href="http://en.wikipedia.org/wiki/Comparison_of_display_technology"><span + style="font-weight: bold;">refresh</span> or <span + style="font-weight: bold;">non-refresh</span> displays</a>. + Typically only LCD (Liquid Crystal) displays have a non-refresh + nature. <span style="font-weight: bold;">2)</span> It may select an + instrument calibration matrix suitable for a particular display + type. The selections available depends on the type and model of + instrument, and a list of the options for the discovered instruments + will be shown in the <a href="ArgyllDoc.html#CmdLine">usage</a> + information. For more details on what particular instruments support + and how this works, see <a href="instruments.html">Operation of + particular instruments</a>. <b>3)</b> Any installed CCSS files + (if applicable), or CCMX files. These files are typically created + using <a href="file:///D:/src/argyll/doc/ccxxmake.html">ccxxmake</a>, + and installed using <a + href="file:///D:/src/argyll/doc/oeminst.html">oeminst</a>. The + default and Base Calibration types will be indicated in the usage.<br> + <br> + <a name="s"></a><span style="font-weight: bold;">-s</span>: By + default only the colorimetric information (XYZ value) will be saved, + but for instruments that support spectral readings (such as the + Gretag Spectrolino), the <b>-s</b> option will save the spectral + readings to the .ti3 file as well.<br> + <br> + <a name="k"></a> <span style="font-weight: bold;">-k: </span>If a + display video lookup table calibration <a + href="File_Formats.html#.cal">.cal</a> file is provided, it will + be loaded into the display <span style="font-weight: bold;">ViedoLUTs</span> + while the measurements are being taken, thereby being applied to the + measurement values, and the calibration will also included in the + resulting .ti3 data file, so that <a href="colprof.html">colprof</a> + can include it as a <span style="font-weight: bold;">vcgt</span> + tag in the resulting profile. This is the <span style="font-weight: + bold;">normal</span> way to profile a calibrated display. The + calibration file has usually been created using <a + href="dispcal.html">dispcal</a>. If a calibration file is not + created, then the display will be read in whatever calibration state + it is in. If the calibration file indicates that the displays + VideoLUTs are not accessible, or if they prove not to be accessible, + then dispread will switch to <span style="font-weight: bold;">-K</span> + mode (see below). <span style="font-weight: bold;">NOTE</span> that + the calibration is loaded into the display hardware just before the + instrument starts measurement, after the test window first appears.<br> + <br> + <a name="K"></a> <span style="font-weight: bold;">-K: </span>If a + display video lookup table calibration <a + href="File_Formats.html#.cal">.cal</a> file is provided, it will + be applied to the test values for each measurement, and also + included in the resulting .ti3 data file, so that <a + href="colprof.html">colprof</a> can include it as a <span + style="font-weight: bold;">vcgt</span> tag in the resulting + profile. This is <span style="font-weight: bold;">NOT</span> + normally the best way to profile a calibrated display, since the + frame buffer may have lower precision than the VideoLUTs output + values.<br> + <br> + <a name="P"></a> The <span style="font-weight: bold;">-P</span> + parameter allows you to position and size the test patch window. By + default it is places in the center of the screen, and sized + appropriately for the type of instrument. The <span + style="font-weight: bold;">ho</span> and <span + style="font-weight: bold;">vo</span> values govern the horizontal + and vertical offset respectively. A value of 0.0 positions the + window to the far left or top of the screen, a value of 0.5 + positions it in the center of the screen (the default), and 1.0 + positions it to the far right or bottom of the screen. If three + parameters are provided, then the <span style="font-weight: bold;">ss</span> + parameter is a scale factor for the test window size. A value of 0.5 + for instance, would produce a half sized window. A value of 2.0 will + produce a double size window. If four parameters are provided, then + the last two set independent horizontal and vertical scaling + factors. Note that the ho,vo,ss or ho,vo,hs,vs numbers must be + specified as a single string (no space between the numbers and the + comma). For example, to create a double sized test window at the top + right of the screen, use <span style="font-weight: bold;">-P 1,0,2</span> + . To create a window twice as wide as high: <span + style="font-weight: bold;">-P 1,0,2,1</span>.<br> + <br> + <a name="F"></a> The <span style="font-weight: bold;">-F</span> + flag causes the while screen behind the test window to be masked + with black. This can aid black accuracy when measuring CRT displays + or projectors.<br> + <br> + <a name="n"></a><span style="font-weight: bold;">-n</span>: When + running on a UNIX based system that used the X11 Windowing System, <b>dispread</b> + normally selects the override redirect so that the test window will + appear above any other windows on the display. On some systems this + can interfere with window manager operation, and the <b>-n</b> + option turns this behaviour off.<br> + <br> + <a name="J"></a> The -<span style="font-weight: bold;">J</span> + option runs through the black and sensor relative calibration + routines for the Xrite DTP92 and DTP94 instrument, the black level + calibration for the Eye-One Display 1, and a CRT frequency + calibration for the Eye-One Display 2. For the black calibration the + instrument should be placed on an opaque, black surface, and any + stray light should be avoided by placing something opaque over the + instrument. If a Spectrolino is being used, then a white and black + calibration will always be performed before the instrument can be + placed on the display, unless the <a href="#N">-N</a> flag is used. + Generally it is not necessary to do a calibration every time an + instrument is used, just now and again. There is no point in + doing a CRT frequency calibration, as this will be done + automatically at the commencement of patch reading.<br> + <br> + <a name="N"></a> <span style="font-weight: bold;">-N</span> Any + instrument that requires regular calibration will ask for + calibration on initial start-up. Sometimes this can be awkward if + the instrument is being mounted in some sort of measuring jig, or + annoying if several sets of readings are being taken in quick + succession. The -<span style="font-weight: bold;">N</span> + suppresses this initial calibration if a valid and not timed out + previous calibration is recorded in the instrument or on the host + computer. It is advisable to only use this option on the second and + subsequent measurements in a single session.<br> + <br> + <a name="H"></a> The -<span style="font-weight: bold;">H</span> + option turns on high resolution spectral mode, if the instrument + supports it. See <a href="instruments.html">Operation of particular + instruments</a> for more details. This may give better accuracy + for display measurements.<br> + <br> + <a name="w"></a>The <b>-w</b> flag disables the normalisation of + the white patch value to 100.0, resulting in values that are in + cd/m^2. This is mainly for diagnostic purposes.<br> + <br> + <a name="X1"></a> The -<span style="font-weight: bold;">X <span + style="font-style: italic;">file.ccmx</span></span> option reads + a <a href="File_Formats.html#.ccmx">Colorimeter Correction Matrix</a> + from the given file, and applies it to the colorimeter instruments + readings. This can improve a colorimeters accuracy for a particular + type of display. A list of contributed <span style="font-weight: + bold;">ccmx</span> files is <a href="ccmxs.html">here</a>.<br> + <br> + <a name="X2"></a> The -<span style="font-weight: bold;">X <span + style="font-style: italic;">file.ccss</span></span> option reads + a <a href="File_Formats.html#.ccss">Colorimeter Calibration + Spectral Sample</a> from the given file, and uses it to set the + colorimeter instruments calibration. This will only work with + colorimeters that rely on sensor spectral sensitivity calibration + information (ie. the X-Rite <span style="font-weight: bold;">i1d3</span>, + or the DataColor <span style="font-weight: bold;">Spyder4</span>).This +can +improve +a + + + + + + + + + + + + + + colorimeters accuracy for a particular type of display.<br> + <br> + <a name="Q"></a> The <b>-Q</b> flag allows specifying a tristimulus + observer, and is used to compute PCS (Profile Connection Space) + tristimulus values from spectral readings or using a colorimeter + that has CCSS capability. The following choices are available:<br> + <b> 1931_2</b> selects the standard CIE 1931 2 degree + observer. The default.<br> + <b>1964_10</b> selects the standard CIE 1964 10 degree + observer.<br> + <b>1955_2</b> selects the Stiles and Birch 1955 2 degree + observer<br> + <b>1978_2 </b>selects the Judd and Voss 1978 2 degree + observer<br> + <b>shaw</b> selects the Shaw and Fairchild 1997 2 degree + observer<br> + <b>1964_10c</b> selects a version of the CIE 1964 10 degree + observer that has been adjusted using a 3x3 matrix to better agree + with the 1931 2 degree observer.<br> + <br> + <span style="font-weight: bold;">NOTE</span> that if you select + anything other than the default 1931 2 degree observer, that the Y + values will not be cd/m^2, due to the Y curve not being the CIE 1924 + photopic V(λ) luminosity function.<br> + <br> + <a name="I"></a> The -<span style="font-weight: bold;">I <span + style="font-style: italic;">b|w</span></span> options invoke + instrument black level, and display white level compensation + (respectively). Instrument black level drift compensation attempts + to combat instrument black calibration drift by using a display + black test patch as a reference. If an instrument is not + acclimatised sufficiently to the measurement conditions, changes in + temperature can affect the black readings. Display white level drift + compensation attempts to combat changes in display brightness as it + warms up by measuring a white patch every so often, and using it to + normalise all the other readings. If just instrument black drift + compensation is needed, use <span style="font-weight: bold;">-Ib</span>. + If just display white level compensation is needed, use <span + style="font-weight: bold;">-Iw</span>. If both are needed, use <span + style="font-weight: bold;">-Ibw</span> or <span + style="font-weight: bold;">-Iwb</span>.<span style="font-weight: + bold;"> <br> + <br> + </span><a name="YA"></a> The -<span style="font-weight: bold;">Y A</span> + option uses a non-adaptive integration time emission measurement + mode, if the instrument supports it, such as the Eye-One Pro or + ColorMunki. By default an adaptive integration time measurement mode + will be used for emission measurements, but some instruments support + a fixed integration time mode that can be used with display devices. + This may give increased consistency and faster measurement times, + but may also give less accurate low level readings.<br> + <span style="font-weight: bold;"> <br> + </span><a name="C"></a> The -<span style="font-weight: bold;">C</span> + <span style="font-weight: bold;">"command" </span>option allows a + method of relaying each test value to some other display than that + on the system running dispread (for instance, a photo frame, PDA + screen etc.), by causing the given command to be invoked to the + shell, with six arguments. The first three arguments are the RGB + test color as integers in the range 0 to 255, the second three + parameters are the RGB test color as floating point numbers in the + range 0.0 to 1.0. The script or tool should relay the given color to + the screen in some manner (e.g. by generating a raster file of the + given color and sending it to the display being profiled), before + returning. Note that a test window will also be created on the + system running dispread.<br> + <br> + <a name="M"></a> The -<span style="font-weight: bold;">M</span> <span + style="font-weight: bold;">"command" </span>option allows a + method of gathering each test value from some external source, such + as an instrument that is not directly supported by Argyll. The given + command is involked to the shell, with six arguments. The first + three arguments are the RGB test color as integers in the range 0 to + 255, the second three parameters are the RGB test color as floating + point numbers in the range 0.0 to 1.0. The script or tool should + create a file called <span style="font-weight: bold;">"command.meas</span>" + that contains the XYZ values for the given RGB (or measured from the + test window) in cd/m^2 as three numbers separated by spaces, before + returning. If the command returns a non-zero return value, dispread + will abort. Note that a test window will also be created on the + system running dispread.<br> + <br> + <a name="W"></a>The <b>-W</b> <span style="font-weight: bold;">n|h|x</span> + parameter overrides the default serial communications flow control + setting. The value <span style="font-weight: bold;">n</span> turns + all flow control off, <span style="font-weight: bold;">h</span> + sets hardware handshaking, and <span style="font-weight: bold;">x</span> + sets Xon/Xoff handshaking. This commend may be useful in workaround + serial communications issues with some systems and cables. <br> + <br> + <a name="D"></a>The <b>-D</b> flag causes communications and other + instrument diagnostics to be printed to stdout. A level can be set + between 1 .. 9, that may give progressively more verbose + information, depending on the instrument. This can be useful in + tracking down why an instrument can't connect.<br> + <br> + <a name="p1"></a> The final parameter on the command line is the + base filename for the <a href="File_Formats.html#.ti1">.ti1</a> + input file, and the <a href="File_Formats.html#.ti3">.ti3</a> + output file. <b>dispread</b> will add the .ti1 and .ti3 extensions + automatically.<br> + <br> + <span style="font-weight: bold;">NOTE</span> that on an X11 system, + if the environment variable <span style="font-weight: bold;">ARGYLL_IGNORE_XRANDR1_2</span> + is set (ie. set it to "yes"), then the presence of the XRandR 1.2 + extension will be ignored, and other extensions such as Xinerama and + XF86VidMode extension will be used. This may be a way to work around + buggy XRandR 1.2 implementations.<br> + <br> + <hr style="width: 100%; height: 2px;"><br> + If a large number of patches is being read, the screensaver on many + systems can interfere with the operation of dispread. It is + therefore advisable in these cases to manually turn off the + screensaver before commencing the measurements.<br> + <br> + If communications break down with a USB connected instrument, you + may have to unplug it, and plug it in again to recover.<br> + <br> + Some systems (Apple OSX in particular) have a special set of user + interface controls ("Universal Access") that allows altering the + display in ways designed to assist visually impaired users, by + increasing contrast etc. This will interfere badly with any attempts + to calibrate or profile such a system, and must be turned off in + order to do so. Note that certain magic keyboard sequences can turn + this on by accident.<br> + <br> + <br> + <br> + </body> +</html> |