Luminous Landscape Forum

Raw & Post Processing, Printing => Digital Image Processing => Topic started by: oversky on November 22, 2006, 11:08:28 pm

Title: Some color space questions
Post by: oversky on November 22, 2006, 11:08:28 pm

One of my camera saves files in sRGB JPEG format. However, the icc
profile generated by the iCorrect has a color space that is greater
than Adobe RGB. Does it really helpful to set photoshop working space
to ProPhoto RGB, since the original file is in sRGB.

After applying the camera profile, the gradient color is not as smooth
as the original. What's wrong?
I use the following image to generate profile. I think the explosure
of the color checker board is pretty good.
http://www.imaging-resource.com/PRODS/A80/...ES/A80DBAWB.HTM (http://www.imaging-resource.com/PRODS/A80/FULLRES/A80DBAWB.HTM)

Title: Some color space questions
Post by: Jonathan Wienke on November 23, 2006, 02:12:48 pm

What is iCorrect? Some kind of camera profiling tool?

Any time you assign a larger-gamut color space to an image, the color variation between one RGB value and the next is increased, so any unevenness in color gradients will become more pronounced. With color spaces equivalent to Adobe RGB or larger, it is difficult to avoid some posterization/banding because the color intervals between one RGB value and the next are sometimes greater than the eye's ability to distinguish one color from another.