GIMP 3.0.2 bug (?) - TIFF image

[dziadekles]

(04-13-2025, 09:12 AM)rich2005 Wrote: You might be lucky, there is a Gimp dev who does visit and is involved in color management.
I would give details of the actual color profile used that gives that odd version for the tiff image.
Edit: Just had another compare with RGB tiff images and I can not repeat your result between Gimp and other file viewers.  
Maybe post that tiff image (or similar) and perhaps a cause determined.

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Differences in the way the same image shows in different programs has been noted in the past, especially CMYK jpegs, but I believe improved now.

I would be careful using MS Photo (this is MS Photo ?) it will automatically brighten images.

If I do a comparison  kubuntu linux / Gimp 3.0.2 / Krita 5.2.6 A very bright image that will never print as RGB - too much out-of-gamut. There is no real difference betweem Gimp soft-proofing / CMYK export (SWOP) and the exported image opened in Krita. As a comparison the CMYK file open in a non-color-managed file viewer.



Typo - that should be CMYK - I once read a short story where everything was typed one key to the left
...but then I have a run-of-the-mill Brother inkjet, know the limitations of computer display / printer and print very much as intended from RGB images. If I send off to a commercial printer, then it depends on the printing company as to color profile used.

Edit: Just had another compare with RGB tiff images and I can not repeat your result between Gimp and other file viewers.

OK, part of the puzzle found its explanation:
It appears that after opening RAW file in GIMP and converting to the default color profile - all exports WITH THE EXCEPTION of TIFF are saved with the default color profile. TIFF exported by GIMP needs to be saved WITH color profile.
Both files, however, show in GIMP as identical images...

But both files still CAN'T be opened in DPP4 or PW8.

One more thing: TIFFs from DPP4 and PW8 have the same size: 48,483 KB.
The TIFF from GIMP is 96,361 KB (without profile) and 96,362 KB (with profile).

EDIT: this makes sense for TIFFs from PW8 and DPP4: Image size is 3514x2340 pixels, so TIFF file size is 3514x2340x16/1024 = 48,181 KB (plus some embedded TIFF data).
So - why is TIFF from GIMP TWICE THE SIZE?

There is definitely something strange with the TIFFs created in GIMP.