1. Download and unzip file. 2 icc files were enclosed in the zip file.
a) 0_jc1RGB (beta1).icc
b) 0_sRGB_D50_jc1 (beta1).icm
2. Drag or copy the files into the system icc file folder or
in PC, left click on the icc file and select install.
3. Start Photoshop CS and confirm that the 2 icc files are available for selection.Perceptual Rendering Intent -- conversion from ProPhoto to sRGB color space
Load your ProPhoto (wide gamut rgb, best rgb or beta rgb ) image file into Photoshop CS.
1. In CS, convert with 0_jc1RGB (beta1).icc
Rendering intent is always absolute regardless of intent selected.
You may observe insignificant changes on your display screen if color gamut for your image is well within the color gamut for 0_jc1RGB. Make sure you click OK to complete the conversion.
Both the downloaded icc files use standard D50 illuminant and Gamma 2.2 and they are of V2 icc specification.
2. Next, convert with 0_sRGB_D50_jc1 (beta1).icm
This icc profile resemblances closely the standard sRGB, but has added saturation and perceptual rendering intents.
Choose Perceptual rendering for best image reproduction.
Toggle PREVIEW to detect the differences before and after conversion.
Depending on the image color gamut, the other rendering intents may work for you as well.
Now, your image has been converted to sRGB color space from ProPhoto color space, perceptually (provided it works!). You can do a profile assign to sRGB or convert to sRGB. The file size for 0_sRGB_D50_jc1 (beta1).icm is about 1.4 Mbytes and hence may increase the storage file size significantly if you choose not to re-assign or convert to standard sRGB.
Examine your converted image and compare it with the original image.
Problem encountered so far:
1) Blue channel for Wide Gamut rgb has knee effect (higher red), but only limited to range 240< B <255. Unsure if this phenomenon is due to highly saturated color being displayed on a standard sRGB monitor. < Solved >
2) My testings are limited to using simulated color patches. I am unsure how well it works for actual high gamut images.
3) I am using a standard sRGB monitor and hence cannot see the true reproduction color for highly saturated colors. I can only peek and poke the color values ( rgb and Lab).
Feedback your observation and post your converted image here. You can help me in fine tuning these icc profiles for better color reproduction.
You may send your image file to [email protected]
, tiff file preferred and limited to total 10 files for now.
... Update download link
(pm me if you can't download)