Mike Russell wrote:
I would recommend against using a monitor profile as your working color space because very convenient to have a neutral gray when red,
green, and blue are equal.
"Paul Mitchum" wrote in message
The point of profiles and color management is that you’ll *see* gray at equal RGB values *regardless of the response curve of the output device.*
Yes, you will see gray at equal RGB values. The opposite is not true. Because of visual effects such as visual accomodation, you will also see gray at approximately equal RGB values, and this will result in a subtle color cast that will affect colors throughout the image. For this reason is is poor practice to rely on visual appearance alone when correcting a color cast. A numeric comparison of RGB values is a much better way to determine a neutral.
For those who are inclined to experiment, fill a large image with RGB(118,128,128), which is a medium blue color. Stare at the center of it for 5 seconds, and close the window so that you are looking at Photoshop’s gray background. It will look pink for several seconds. This is why you cannot trust your eyes alone for determining a gray color.
Numeric RGB values for gray are not guaranteed to be equal when you use a monitor profile as your working space. For this reason using a standard working space, such as sRGB or Adobe RGB is preferred.
If the working profile and the output profile are color
managed, then (ideally) you won’t be able to tell that there’s any difference.–
There will be no visual difference in any case, provided you convert between profiles, even if those profiles are incorrect.
Mike Russell
www.curvemeister.com/forum/