Conversion from U.S WebCoated (SWOP) to IsoCoated V2

[SuperMario]

I have a pdf with an U.S. Webcoated(Swop) output intent.
This has a yellow square wich is 4% c, 0% m, 94% y, 0 black.
When i convert this to the IsoCoated profile, i get different colorvalue's: 8% c, 0% m, 86% y, 0 black
I did this conversion with GMG Colorserver.

Is it correct this way? Because the yellow become's much greener this way.

 

[Correct Color]

You're probably using perceptual rendering intent. Try relative colorimetric.

Mike Adams
Correct Color

 

[Stephen Marsh]

I tested the L*a*b* values quickly in Photoshop using AbsCol rendering intent:

Original colour values = L83 a-8 b76
New colour values = L87 a-8 b75

They are both as green as each other and almost as yellow as each other, the major difference being the L value... Despite/independently of Lab values, I don't think that cyan is good when you want yellow, a little magenta would be better (this being an artistic viewpoint and not a scientific one).

Relative intent gives different numbers in the above test, with the green being the same with more variation in the yellow.


Stephen Marsh

 

[lyzan]

Did you create your own MX4 in GMG?