<div>Kai-Uwe:</div><div><br></div>I find myself mostly agreeing with Michael Sweet here. <div>Override controls at printing are useful in certain cases (eg. printing with a paper similar but not identical to a known type) but in practice they cause a lot of problems and should be secured with a big red button which says "HURT ME!".</div>
<div><br><div>Edmund</div><div><br><div><div><div class="gmail_quote">On Tue, Jan 24, 2012 at 8:20 PM, Michael Sweet <span dir="ltr"><<a href="mailto:msweet@apple.com">msweet@apple.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On Jan 24, 2012, at 9:18 AM, Kai-Uwe Behrmann wrote:<br></div><div class="im">
> How does the CMS select the right calibration gamma?<br>
<br>
</div>The CMS doesn't. The DEVICE PROFILE contains any calibration data needed to go from the PCS to the device color space. The document contains the profile (or a reference) so that the CMS can convert document color to the PCS, and from there to device color using the device profile.<br>
<br>
Gamma (as a user setting) is a crutch that CUPS provided (along with "brightness") to deal with the limitations of color management before ICC. It isn't supported on the Mac and has been deprecated in CUPS for a while now - I think only the CUPS imagetoxxx filters support it these days...<br>
<br>
There are far better ways to manipulate the apparent brightness, shadow detail, etc. of a photo in order to produce the best artistic rendition of that photo on paper. Gamma, by itself, is a poor substitute and only encourages bad color management to proliferate.<br>
<div class="im HOEnZb"><br>
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Michael Sweet, Senior Printing System Engineer, PWG Chair<br>
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