Can I edit version 4 input ICC profiles?
Yes! Custom Color Tools will edit all ICC-compliant profiles. Some version 4 input profiles have more than that one rendering intent. Custom Color V3.1 only edits the perceptual rendering intent, but Photoshop will not use the perceptual rendering intent if the profile is only assigned (Image > Mode > Assign Profileā¦) to the image. It will appear that the edit did not work because Photoshop does not use the perceptual transform until the image is actually converted using profiles (Image > Mode > Convert to Profileā¦). To apply the perceptual intent in Photoshop you must convert to a working space using the perceptual rendering intent.