Perceptual Rendering Intent -- ProPhoto to sRGB

[Tim Lookingbill]

I see what you're doing.

Try these test swatches and gradients I came up with that noticeably shift when converting directly from ProPhotoRGB to sRGB.

Create a new document in ProPhotoRGB in Photoshop and make these RGB color swatches:

Yellow: R240,G230,B30
Cyan:   R10,G100,B245
Navy Blue: R35,G10,B120
Cobalt Blue: R30,G20,B235...

From these create a white to color gradient for each and afterward convert normally to sRGB the entire document and see if you get a shift. If you do see a shift, try it using your JcSPACE or jc1RGB method described in this thread in order to reduce shifting of these colors.

[Steve Rolls]

Sorry for necro.

http://rghost.net/59423022 - this is the file which I am converting.
http://rghost.net/59423929 - this is the result of two step conversion.

http://www.color.org/profiles/srgb_appearance.xalter - beta v4 sRGB profile.

http://rghost.net/59424083 - perceptual conversion to "appearance" profile.
http://rghost.net/59424089 - relative conversion to "apperance" profile.

As you may see none of conversions results in smooth image, every one of those three has artifacts.

Is there really no way to convert saturated rainbow to sRGB without artifacts?