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Re: colors darker on win32 than on mac

To: REALbasic NUG <realbasic-nug at lists dot realsoftware dot com>
Subject: Re: colors darker on win32 than on mac
From: Frank Condello <developer at chaoticbox dot com>
Date: Sun, 31 Oct 2004 00:40:25 -0400
Delivered-to: realbasic-nug at lists dot realsoftware dot com
References: <5FBAB87C-2AE9-11D9-87F0-000D932AEE70 at juun dot com> <0C4550E9-2AEA-11D9-9E96-000A95A9544A at shaw dot ca> <77F3ADC2-2AEA-11D9-87F0-000D932AEE70 at juun dot com> <1A765149-2AEC-11D9-9941-003065D606C2 at teachesme dot com> <CFDD5B7A-2AEC-11D9-87F0-000D932AEE70 at juun dot com>
you  could look at http://www.cgsd.com/papers/gamma.web.html

great article.  thanks.

it mentions that the PNG format may support gamma correction internally.

anyone know how i could use that to use only one pic file for all platforms?

My PNG Utilities plugin can read/write embedded gamma (available here: <http://developer.chaoticbox.com>) but I would highly recommend leaving such settings up to the user. Gamma "correction" is rarely correct system to system or eyeball to eyeball for that matter. You can start with some generally accepted values but the user should have the final say as to what is correct for his system and/or eyeballs.

Also note that gamma correction != colour correction, so the colour can (and will) be way off even if you ramp the gamma perfectly. I'd simply suggest not worrying about this stuff unless it's essential to your app - your users probably won't care or notice. If it is essential, provide some sort of visual calibration preference.

Frank.
------------
Open Source RB Plugins and Classes
<http://developer.chaoticbox.com>

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