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Diffstat (limited to 'doc/fakeread.html')
| -rw-r--r-- | doc/fakeread.html | 186 |
1 files changed, 104 insertions, 82 deletions
diff --git a/doc/fakeread.html b/doc/fakeread.html index 2a7b5c0..376e971 100644 --- a/doc/fakeread.html +++ b/doc/fakeread.html @@ -3,7 +3,7 @@ <head> <title>fakeread</title> <meta http-equiv="content-type" content="text/html; - charset=ISO-8859-1"> + charset=windows-1252"> <meta name="author" content="Graeme Gill"> </head> <body> @@ -34,6 +34,9 @@ style="font-family: monospace;"></span><i style="font-family: monospace;">profile.</i><span style="font-family: monospace;">[icm|mpp|ti3] + + + </span><i style="font-family: monospace;">inoutfile</i></small><small><span style="font-family: monospace;"><br> -v @@ -44,24 +47,45 @@ Video encode device input to sepration as:<br> n + + + normal 0..1 full range RGB levels (default)<br> t + + + (16-235)/255 "TV" RGB levels<br> 6 + + + Rec601 YCbCr SD (16-235,240)/255 "TV" levels<br> 7 + + + Rec709 1125/60Hz YCbCr HD (16-235,240)/255 "TV" levels<br> 5 + + + Rec709 1250/50Hz YCbCr HD (16-235,240)/255 "TV" levels<br> 2 + + + Rec2020 YCbCr UHD (16-235,240)/255 "TV" levels<br> C + + + Rec2020 Constant Luminance YCbCr UHD (16-235,240)/255 "TV" levels<br> -p <i>separation.icm</i> Use device link separation @@ -69,7 +93,13 @@ -E flag Video decode separation device output. See -e above<br> - -k <i>file.cal</i> + -Z nbits </span></small><small><span + style="font-family: monospace;"><small><span style="font-family: + monospace;">Quantize test values to fit in nbits<br> + </span></small> -k <i>file.cal</i> + + + Apply calibration (include in .ti3 output)<br> -i <i>file.cal</i> Include calibration in .ti3 output, but don't apply it<br> @@ -82,32 +112,42 @@ -0 pow Apply power to device chanel 0-9<br> - -b <i>output.icm</i> Apply - BT.1886-like mapping with effective gamma 2.2<br> - -b g.g:<i>output.icm</i> Apply BT.1886-like mapping with - effective gamma g.g<br> - -B <i>output.icm</i> Apply - BT.1886 mapping with technical gamma 2.4<br> - -B g.g:<i>output.icm</i> Apply BT.1886 mapping with - technical gamma g.g<br> + -B + display.icm + Use BT.1886 source EOTF with technical gamma 2.4<br> + -b g.g:display.icm Use + BT.1886-like source EOTF with effective gamma g.g<br> + -b p.p:g.g:display.icm Use effective gamma g.g + source EOTF with p.p prop. output black point offset<br> + -g g.g:display.icm Use + effective gamma g.g source EOTF with all output black point + offset<br> -I intent r = relative colorimetric, a = absolute (default)<br> -A L,a,b Scale black point to target Lab value<br> -l + + + Output Lab rather than XYZ<br> -s + + + Lookup </span></small><small><span style="font-family: monospace;"><small><a style="font-family: monospace;" - href="File_Formats.html#MPP">MPP</a></small> - spectral values</span></small><br> + href="File_Formats.html#MPP">MPP</a></small> spectral values</span></small><br> <small><span style="font-family: monospace;"><small><span style="font-family: monospace;"> -R level Add average random deviation of <level>% to output PCS values<br> </span></small> -u + + + Make random deviations have uniform distributions rather than normal<br> -S @@ -130,6 +170,9 @@ + + + Base name for input[</span><a style="font-family: monospace;" href="File_Formats.html#.ti1">.ti1</a><span style="font-family: monospace;">]/output[</span><a @@ -179,12 +222,34 @@ <br> <a name="E"></a>The <b>-E</b> <i>flag</i> applies a Video decoding to the output of the separation.<small><small> </small></small>See - <a href="#e"><b>-e</b></a> for the list of decodings.<br> + + + + <a href="#e"><b>-e</b></a> for the list of decodings. Setting a + video encoding for output will also set quantization of 8 bits (see + -Z flag below). If your video connection is better than 8 bits (ie. + 10 or 12 bits), then you may wish to raise this default.<br> + <br> + <a name="Z"></a> <b>-Z nbits </b>Normally the target device values + are floating point numbers that may get rounded and quantized in the + process of printing them or reproducing them on the display device. + If some of this quantization can be accounted for, it may improve + the accuracy of the resulting profile, and the <span + style="font-weight: bold;">Q</span> parameter allows this + quantization to be specified. The parameter is the number of binary + digits (bits) that the device values should be quantized to. An idea + of the number of bits of precision that makes its way to your + display can be obtained by using <a + href="file:///D:/src/argyll/doc/dispcal.html#R">dispcal -R</a> If + Video encoding is selected (see -E flag above), then 8 bits is + selected by default. On systems using an VGA connection or Display + Port with a graphics card with VideoLUT entries with greater than 8 + bits depth, or if using the MadVR rendered with dithering, then a + higher bit depth is typically possible.<br> <br> <a name="k"></a>The <b>-k file.cal</b> parameter specifies a - calibration file created by <a - href="printcal.html">printcal</a> or <a - href="dispcal.html">dispcal</a>, and the supplied calibration + calibration file created by <a href="printcal.html">printcal</a> or + <a href="dispcal.html">dispcal</a>, and the supplied calibration curves will be applied to the chart device values after any separation and before the device profile. This allows emulating a system that uses per device channel calibration. The calibration @@ -193,26 +258,24 @@ computation of ink limits.<br> <br> <a name="i"></a> The <b>-i file.cal</b> parameter specifies a - printer calibration file created by <a - href="printcal.html">printcal</a> or <a - href="dispcal.html">dispcal</a>, and the - calibration curves will be included in the included in the resulting - .ti3 file, so that they can be passed through to the ICC profile, to - allow accurate computation of ink limits. The calibration <span + printer calibration file created by <a href="printcal.html">printcal</a> + or <a href="dispcal.html">dispcal</a>, and the calibration curves + will be included in the included in the resulting .ti3 file, so that + they can be passed through to the ICC profile, to allow accurate + computation of ink limits. The calibration <span style="font-weight: bold;">is not applied</span> to tchart values. <span style="font-weight: bold;">Note</span> that if the supplied ICC profile contains VCGT calibration curves, that these will be included in the resulting .ti3 by default.<br> <br> <a name="K"></a>The <b>-K</b> <b>file.cal</b> parameter specifies - a calibration file created by <a - href="printcal.html">printcal</a> or <a - href="dispcal.html">dispcal</a>, and the - inverse of the supplied calibration curves will be applied to the - chart device values after any separation and before the device - profile. This allows for undoing calibration curves that may be part - of a video calibration device link, so that the (calibrated device - value) device profile will work as expected.<br> + a calibration file created by <a href="printcal.html">printcal</a> + or <a href="dispcal.html">dispcal</a>, and the inverse of the + supplied calibration curves will be applied to the chart device + values after any separation and before the device profile. This + allows for undoing calibration curves that may be part of a video + calibration device link, so that the (calibrated device value) + device profile will work as expected.<br> <br> <a name="r"></a>The <span style="font-weight: bold;">-r</span> parameter is a way of simulating instability in the behaviour of the @@ -230,59 +293,18 @@ them to the power of the parameter. This applies a transfer curve to the simulated device response.<br> <br> - <a name="b"></a>The <b>-b output.icm</b> flag applies extra input - processing, applying <a - href="http://www.itu.int/rec/R-REC-BT.1886-0-201103-I">BT.1886</a>-like - - - - - - - - - - - - video gamma mapping using an effective gamma of 2.2 by default, and - overridable using <b>-b g.g:output.icm</b> where <b>g.g</b> is the - gamma. <b>output.icm</b> is the display ICC profile that provides - the black point that the BT.1886 curves will target. The gamma is an - effective gamma, meaning that its effect on 50% input is the same as - that of a pure power curve, in spite of any black offset added by - BT.1886. This has the benefit of making the overall effect of - brightness independent of the black level of the display. Setting an - effective gamma other than 2.2 is one way of making the viewing - condition adjustment for the different conditions of video encoding - and decoding, or for modelling the source colorspace as a rendering - on a video display. BT.1886 will only work with matrix type input - profiles. Typically this will be used to create a verification test + <b><a name="b"></a></b>The <b>-[b|B|g|G] [p.p:][g.g:]</b><b>display.icm</b> + series of options, substitutes an alternative EOTF (Electro-Optical + Transfer Function) for the one specified by the matrix input + profile. <b>display.icm</b> is the display ICC profile that + provides the black point that the gamma curve curves will target. + Typically these options will be used to create a verification test set for checking the operation of a device link or 3dLut created - using <a href="collink.html">collink</a>, using the same BT.1886 - parameters.<br> - <br> - <b><a name="B"></a></b>The <b>-B output.icm</b> flag applies extra - input processing, applying <a - href="http://www.itu.int/rec/R-REC-BT.1886-0-201103-I">BT.1886</a>-like - - - - - - - - - - - - video gamma mapping using a gamma of 2.4 by default, and overridable - using <b>-B g.g:output.icm</b> where <b>g.g</b> is the gamma. <b>output.icm</b> - is the display ICC profile that provides the black point that the - BT.1886 curves will target. The gamma is the technical gamma, or - power applied to the input image, and this means that its effect on - 50% input will depend on the black level of the display, making the - overall brightness somewhat unpredictable. For a more predictable - effect, use <b>-b</b>.<br> + using <a href="collink.html">collink</a>, using the same gamma + curve parameters. See <a href="collink.html#Ib">collink -I b</a> + for a full explanation of these parameters, and <a + href="Scenarios.html#TV2">Verifying Video Calibration</a> for more + detail.<br> <br> <a name="I"></a>The <span style="font-weight: bold;">-I</span> parameter allows changing the intent used in looking up the ICC |