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+--- Thread: GIMP 3 printing problem (?) (/Thread-GIMP-3-printing-problem)
GIMP 3 printing problem (?) - dziadekles - 04-30-2025
I just tried to produce custom paper profiles for Canon G660 (that will be G620 in the US if I am not mistaken). Calibrite ColorChecker Studio was used.
The monitor profile was created OK, so was the custom paper profile.
From GIMP - I printed the test image with ADOBE RGB color space. The print was OK, very close to the screen image, but one of the pictures in the test image displayed severe banding in a blue graduated sky. The test image was then converted to GIMP sRGB - same result. Finally - the test image was converted to the custom paper profile which was created.
This time - all was OK, no banding, nice colors as close to the screen as one could wish (with proper lighting, that is
So - my question is:
Do I need to always convert any picture to the custom paper profile - before printing from GIMP? (BTW - the printer is using Relative Colorimetric setting, not perceptual).
Or - another question: is there something funny in GIMP color conversions? Or with blue colors? Or - is Canon striking again? (banding was evident even if original Canon printer profiles were used).
I am a little bit confused here (but at least I have a workaround).
This is a screenshot of the banding (colors are funny as the scanner is...well...you know). On the left - image w/o banding, on the right - an example of banding.
![[Image: ccStudiovsCanon.jpg.753598cb3c94472a43fb...0751e9.jpg]](https://media.invisioncic.com/l323473/monthly_2025_04/ccStudiovsCanon.jpg.753598cb3c94472a43fb0feb5a0751e9.jpg)
...and the whole test image.
![[Image: MatrixLarge.jpg.464517772622535ceebc037a8fe34dec.jpg]](https://media.invisioncic.com/l323473/monthly_2025_04/MatrixLarge.jpg.464517772622535ceebc037a8fe34dec.jpg)
RE: GIMP 3 printing problem (?) - Ofnuts - 04-30-2025
URL of the test image?
RE: GIMP 3 printing problem (?) - dziadekles - 05-02-2025
You can find it here:
https://www.northlight-images.co.uk/printer-test-images/
RE: GIMP 3 printing problem (?) - Ofnuts - 05-02-2025
The native image has bands... perhaps not as visible as in your example but there are horizontal lines of JPEG artifacts in the sky.
RE: GIMP 3 printing problem (?) - dziadekles - 05-02-2025
(05-02-2025, 10:56 AM)Ofnuts Wrote: The native image has bands... perhaps not as visible as in your example but there are horizontal lines of JPEG artifacts in the sky.
This may be so - but it does not answer the question: why is the banding so much more pronounced when the test image has color space Adobe RGB, or sRGB, or GIMP sRGB - and practically no banding when converted to the custom printer color space?