Matt,
What output profile are you converting to? What RGB space are you converting
from? And on what kind of monitor are you seeing this?
> I am puzzled by a strange phenomenon in Photoshop.
>
> I take an RGB image, and convert to a CMYK output profile, using Rel Col
> intent *without* black point compensation.
>
> The image, on screen, appears to darken substantially. Most of the image is
> in-gamut for the destination profile.
Gamut warning shows no gray area?
> Checking the L* values of different
> areas of the image before and after the conversion using the eye dropper tool
> shows that the L* values are the same
The same 'relatively' but perhaps not the same 'absolutely' which is one
place where BPC does make a difference, AFAIK.
> - which is what I would expect provided
> the colour is in-gamut for the output device. But, on screen it looks darker
> than the RGB version.
Darker overall or just in the shadows decreasing in the midtones?
> Granted I am not using the current version of Photoshop, perhaps this is a bug
> since squashed. But has anyone else seen this? Is there a reason this should
> be so?
Are you on a Mac? And which version of Photoshop are you using?
> Matthew Larmour
Roger Breton
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