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Gimp exports TIFFs with strange limitations - ESH - 12-08-2025

Gimp 3.2 on Win 11

1. The following image of a castle (with a pole with no flag) was developed from a raw file in Darktable, description and keywords were edited, and it was exported as a TIF.

2. That TIF was imported into Gimp - and another TIF, only showing the associated flag, was imported too.

3. The flag was non-destructively put on the pole in Gimp.

4. A stamp-layer was added from visibles (the castle and the flag layers) - so 3 layers now.

[attachment=14088]

5. Then an export as a TIFF was attempted - with all layers, and all exif data including the description. .... But that brings up the error shown - can't export the description, which apparently has a wrong format.

But worse...! when the exported TIFF is opened in Darktable (without any text at all) - also the flag is missing from the pole, i.e. nothing but the background layer (the castle) has been exported - at least not in a readable format.

[attachment=14089]

How can I make TIFFs from Gimp work normally in my usual workflow with Darktable, i.e. show discription and the collective image?