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diff --git a/doc/monitorcontrols.html b/doc/monitorcontrols.html new file mode 100644 index 0000000..83ab695 --- /dev/null +++ b/doc/monitorcontrols.html @@ -0,0 +1,90 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html> +<head> + <title>About display monitor settings and targets</title> + <meta http-equiv="content-type" + content="text/html; charset=ISO-8859-1"> +</head> +<body> +<h2 style="text-decoration: underline; font-weight: bold;">About +display monitor settings and +targets</h2> +Setting monitor controls and target behaviour for monitor calibration +boils down to two things:<br> +<br> + What is the equipment capable of without introducing side +effects ?<br> +<br> + What are you trying to do ?<br> +<br> +There are three reasons you may want to adjust display settings and set +calibration targets:<br> +<br> +1) You want to change how non-color managed applications appear.<br> +2) You want to change basic behaviour of the display that the profile +based<br> + color management doesn't usually change, such as white +point and brightness.<br> +3) You want to improve the behaviour of the device so that the normal +profile based<br> + color management does a better job of controlling the +display.<br> +<br> +<br> +You can make adjustments to a display using it's controls and/or the +video +card LUTs. Generally the former are more powerful and have less side +effects. There can be exceptions though, for instance LCD's have no +native contrast control capability, only brightness, so contrast is +usually faked by manipulating the lookup curves, which can introduce +side effects. The same applies to white point control on an LCD (unless +it has +R/G/B LED back lighting). So generally LCD displays are much less +flexible than CRT displays in targeting some non-native colorspace +without introducing side effects, so it is generally best to set all +the LCD controls except back lighting brightness to their default +settings.<br> +<br> +Brightness depends on what you are trying to do. If you are trying to +do soft proofing for instance, you will have some brightness level in +mind dictated by the hard proofing booth you are comparing to, or the +ambient brightens level. For good color judgement and low fatigue it's +desirable that the display brightness roughly match that of the ambient +lighting.<br> +<br> +In terms of what you are trying to do, it comes down to what colorspace +you want the display to be, and how far from native for that display it +is. A CRT can be reasonably flexible in the behaviour it can be given +without side effects, an LCD less so. If you want to minimize artefacts +on an LCD you want to set the contrast and white points to their native +values (ie. where the monitor is not manipulating the digital signal +levels). It may not be easy to figure out what this is. In this +scenario you would probably only want calibration to set the transfer +characteristic and neutral axis, and leave the white point native.<br> +<br> +For typical MSWindows/Linux this would probably be the typical CRT +transfer +("gamma") curve, or a gamma of about 2.4. For OS X it would probably <br> +be a gamma of 1.8 for versions 10.5 or earlier, or 2.4 for 10.6 or +latter ("Snow Leopard").<br> +<br> +The nominal white point of a display is D65 (set by Television +standards), and an LCD's native white point is somewhere near there, +but this is dictated by their backlight color. The CRT's will give +maximum brightness with a much higher white point (9000K or so), but +this can be reduced with fewer side effects (just reduced brightness) +using typical CRT controls. <br> +<br> +If you have specific requirements (trying to do soft proofing) then you +may want to target a specific white point and brightness, and be +prepared to compromise other aspects of the display to achieve this. By +all means use the controls to move the display in the direction you +want to go, and then use the calibration curves to get there. If you +are moving far from native (especially on an LCD) you may find the side +effects unacceptable though.<br> +<br> +<br> +<br> +<br> +</body> +</html> |