Summary: | Image much darker after icc_work merge - part deux | ||
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Product: | Ghostscript | Reporter: | Marcos H. Woehrmann <marcos.woehrmann> |
Component: | Color | Assignee: | Michael Vrhel <michael.vrhel> |
Status: | RESOLVED FIXED | ||
Severity: | normal | CC: | christinedelight.top85 |
Priority: | P4 | ||
Version: | master | ||
Hardware: | PC | ||
OS: | All | ||
Customer: | Word Size: | --- | |
Attachments: |
screenshot.png
screenshot2.png |
Description
Marcos H. Woehrmann
2010-07-15 15:59:02 UTC
Created attachment 6489 [details]
screenshot.png
Created attachment 6490 [details]
screenshot2.png
As a further test that the r11305 pkmraw image is closer to the ppmraw image than the head pkmraw image I generated 600 DPI pkmraw images for both versions and then scaled them down to 200 x 200 pixels by using linear interpolation, see attached.
A look at going to tiff32nc and it also occurs there. Apparently I must not be using the transfer function when we are going to CMYK. This should be easy to track down. OK. So the transfer curves ARE getting applied. This is what is creating the negative of the image. The issue is that we are doing a different color conversion from the gray image to a cmyk output color space due to our default ICC profiles. Prior to the ICC merge the code used the default BG/UCR curves and a 1-X type model for this mapping. Running with -dUseCIEColor in 8.71 you will see something even darker than what is created with the ICC code. What I probably need to do is to create a set of ICC profiles that give similar mappings to what the old PS rendering gave without -dUseCIEColor. If someone desired this type of mapping they could swap in those profiles. |