John Cupitt
I made https://github.com/libvips/libvips/pull/4577 for any follow-up work.
Hi @JohnAnon9771, could you upload your overlay and base images too?
I think your art image has been premultiplied -- ie. the alpha has already been blended into the RGB layer. If I run: ``` $ vips composite2 base_image.jpg art_image.png x.png...
Oh, maybe not, I tried unpremultiplying your art image and it looks bad. But I looked at the sources again and I can't see anything wrong with MULTIPLY :( Puzzling!
Ah great detective work. But how strange! That will change all 11 of the PDF blend modes, won't it? You'd think we'd have noticed this before.
I transferred this issue to libvips since I'm not certain this was resolved properly.
Hi @lesolorzanov, You have a strange TIFF image -- plane-separated tiled. This is a format that's theoretically possible within the TIFF spec, but which readers are not expected to implement....
Is this from an olympus scanner? You could perhaps save as DICOM. libvips (via openslide) now has quite good DICOM support.
Ah that's a shame. I don't need BTF support myself, so I think someone would need to pay for it to be added. Most of the libvips devs are also...
Ah I'm a struggling academic too, I know the feeling. Let's tag this as an enhancement. A sample image would be very helpful, if you have any available. Ideally a...