Re: Erroneous color transformations with Apple CMM
Re: Erroneous color transformations with Apple CMM
- Subject: Re: Erroneous color transformations with Apple CMM
- From: Steve Upton <email@hidden>
- Date: Tue, 26 Jan 2010 12:56:36 -0800
At 3:40 PM -0500 1/26/10, Marco Ugolini wrote:
>Klaus Karcher wrote:
>
>>I know that the embedded profile in the source image is fairly off-key
>>and the image is over-exposed, but that's not the point.
>
>Maybe it IS the point.
>
>If you assign AdobeRGB to the image, for example, none of that misbehavior occurs upon using the Apple CMM.
>
>Maybe the "CMP Canon EOS 400D as" profile that is embedded in the image file is non-ICC-compliant or somehow defective, and therefore misbehaving, and for that reason it does become the issue here.
>
>By the way, the image looks badly overexposed only when the Canon profile is assigned to it. When AdobeRGB, or sRGB, or ProPhoto RGB, or one of the other standard working spaces is assigned to it, the detail in the clouds becomes visible again (as it should be, since RGB numbers in the low 200 range should not be represented as featureless white), and no color drift occurs when switching to other CMMs.
>
>Which, to me, seems to point to a malfunctioning PROFILE, not CMM.
Good point Marco,
Also, the Adobe CMM is known to 'fix' certain things in profiles without any notification to the user. So that could also account for the differences you see.
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
________________________________________________________________________
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