[BUG] Filter: Deband/Flash3kdb = defective

[tailland]

hey there.

version 21.8.2026
the above mentioned filter has become(?) defective, producing wildly erroneous output, see image.

loading input file (type irrelevant)
choose whatever settings
= output in the image
   

gradfun3mod still works as intended, with or without gpu support

[Selur]

clip = core.vszip.Deband(clip, thr=(64,64,64), grain=(64,64), sample_mode=5, dynamic_grain=True, keep_tv_range=True)

Ahh,... I forgot to adjust the defaults.
see: https://github.com/dnjulek/vapoursynth-z...b-to-vszip

=> I'll look at it.

Cu Selur

[tailland]

from personal interest: how does that happen?
were you doing doing some casual, crossbrowsing code maintenance when you changed those values to something faulty and forgot to return them to normal? or were those values leftovers from an earlier version of the filter implementation and you forgot to correct them?

[Selur]

flash3kdb: https://github.com/SAPikachu/flash3kyuu_deband is basically abandoned,
neo_flash3kdb: https://github.com/HomeOfAviSynthPlusEvo.../neo_f3kdb is API3 and not available via pip.
vszip.Deband: https://github.com/dnjulek/vapoursynth-zip/wiki/Deband is a faster version of neo_f3kdb with float support.
I switched to it a few weeks ago, but forgot to adjust the scaling.

Cu Selur

Ps.: got it fixed locally, but will first look at "Line/Darken (GLSL-A4K) = defective" before packaging a new dev.