Krita 4.0 (both beta, nightly) seem to hardly handle applying some filters to a large image on my computer. Color to alpha, Gradient maps etc. If the image is larger than around 3k, 4.0 freezes or crashes.

The weird part is that krita 3.3.3 does a fine job.
I wonder if anyone experiences performance difference of filter between krita 3.n and 4.0.

Thanks.

No, I haven't seen any difference. Could you make a crash log? See https://docs.krita.org/Dr._Mingw_debugger

boudewijn wrote:No, I haven't seen any difference. Could you make a crash log? See https://docs.krita.org/Dr._Mingw_debugger

No, I couldn't find the backtrace. (Apparently it wasn't a crash, sorry.) But It has overall slowness of filters compared to 3.n and freezes especially with gradient map and color to alpha.

I just tried again and waited for around 2 minutes to apply color to alpha filter to a 3k x 4k image and it eventually completed. 3.3.3 took 2 seconds.

I really don't know what's the source of it.
Any newly added settings that might affect the filter performance? :q

Hm... the only change in color to alpha is this really computer sciency one: https://phabricator.kde.org/R37:f352cc1 ... 0c56e92b7d

(Basically, the way how we tell Krita to check each pixel is written differently, but it is rare a change like this can cause a crash)

TheraHedwig wrote:Hm... the only change in color to alpha is this really computer sciency one: https://phabricator.kde.org/R37:f352cc1 ... 0c56e92b7d

(Basically, the way how we tell Krita to check each pixel is written differently, but it is rare a change like this can cause a crash)

Ok, Maybe I can check again when the 4.0 is released.

Until then apparently I have to sitck with 3.3.3. It's impossible to use as it is...

https://www.youtube.com/watch?v=yB94VMhjszU

Basic filters like HSV adjustment still work, but they're much slower than 3.n versions as well.

I'm not sure if it's relevant, but turning on instant preview speedup the filter quite a bit. Although it's still extremely slow compared to 3.n.
(* But even with instant preview, same freeze occurs when you 'undo' applying filters like gradient maps and color to alpha (which I guess probably require huge calculations...))

Can I tempt you to make an official bugreport for this at bugs.kde.org, with a link to this thread? Then we can track it, and you will be notified when we've found/solved the culprit

Yes, we'd need a bug report. If you find that Undo is slow, then that's really "interesting" because that just puts back the old pixels, it doesn't filter...

I've done a bugreport. Thanks.

(3.4)
It is fixed now. Can't say how thankful I am.

Keep up the good work!!