Re: Testing Perceptual Rendering in Output Profiles
Re: Testing Perceptual Rendering in Output Profiles
- Subject: Re: Testing Perceptual Rendering in Output Profiles
- From: Lorenzo Ridolfi <email@hidden>
- Date: Mon, 17 Feb 2003 16:40:49 -0300
Hi Tobie,
I do know this color is out of gamut. That's why I'm trying to use
perceptual rendering to map this color to the printer's gamut. I decided to
try perceptual rendering instead of Rel Col because the soft proof on the
screen of the first rendering appeared much more pleasant than the latter.
When I soft proof the test chart, the results on screen are ok, but in the
printer the reds became orange. I made this test because I was trying to
print a real photo, actually a beautiful Ferrari, and not a synthetic test
chart. In both cases (the Ferrari and the color ramp test image) the most
saturated reds turned in some flavor of orange and are ok in the soft proof.
As I said in the first post, It seems that the problem isn't in the gamut
mapping but in the printer characterization, as the hue in the image
converted to the printer color space (using perceptual rendering) appears
to be correct. I'm not expecting a colorimetric reading comparing the
original image in AdobeRGB with the final print on the paper, but I expect
to have a colometric reading in the colors in the image *after conversion
to the printer profile using perceptual intent* to the final print.
Am I asking too much ?
Best Regards,
Lorenzo
At 2/17/2003 11:26 AM -0500, email@hidden wrote:
In a message dated 2/17/03 8:40:41 AM, email@hidden writes:
>Original image in AdobeRGB: 63, 90, 78
>Image converted to print space: 56, 64, 53
>Actual values on the paper: 54.6, 61.2, 46.6
When I build this color in AdobeRGB, and convert it to a 1280 gloss paper
profile, the color is out of gamut (and shows gray with the gamut warning
tool). So I would assume your issue may be one of output gamut limits, along
with other issues, such as colorimetric reading in a Perceptual rendering
intent (thats what Rel Col if for), and possibly some actual deviations.
C. David Tobie
Design Cooperative
email@hidden
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