Jeff Lait

This is for old cops, correct?

You can switch to the Old UI temporarily in Edit Preferences::UI::Old UI. Restart and then you'll have the old preference menu, which contains the Old COP preferences. You can set them there.

That said, the HOUDINI_COP_MAXRES should also have that effect.

We haven't knowingly changed anything in old cops for 22, so it is disappointing to hear that it is now crashing with that set :<

Please submit a bug with a the reproducible setup and we can see what oversight occurred.

Yes, having to use a ROP Image rather defeats the purpose of a having slapcomp.

If you can assemble this into a .hip and submit as a bug to support we can look into it, there could be several different things going wrong at this point.

RGBA with PNG is a bit weird - PNG has non-associated alpha, IIRC, but how people actually write or read it is pretty random.

First pass would be to do a RGBA -> RGB before saving as png to verify your colour space is right. On ROP Image, usually Color Space Conversion: "Bake to Display/View" will get you the WYSIWYG as it will handle any tone-mapping your display may have. If the RGB looks right, then it is an associated alpha issue. On ROP IMage, the Optimization tab has PNG/TGA Pre Multiplication. Try changing to raw and see if your viewer is happier.

Glow I think is building an emissive RGBA which can't be represented as an unassociated alpha, so you'll have to pick a non-zero alpha and bake it down.