Bug 404133 - Artifacts when painting in RGB 32-bit float/channel
Summary: Artifacts when painting in RGB 32-bit float/channel
Status: RESOLVED FIXED
Alias: None
Product: krita
Classification: Applications
Component: Brush engines (show other bugs)
Version: nightly build (please specify the git hash!)
Platform: Manjaro Linux
: NOR normal
Target Milestone: ---
Assignee: Krita Bugs
URL:
Keywords: triaged
: 406400 (view as bug list)
Depends on:
Blocks:
 
Reported: 2019-02-09 10:44 UTC by M
Modified: 2021-01-13 13:11 UTC (History)
6 users (show)

See Also:
Latest Commit:
Version Fixed In:


Attachments
Exported image showing artifacts (2.18 MB, image/png)
2019-02-09 10:44 UTC, M
Details
Shows errors made in 32bit float image. (2.16 MB, application/x-krita)
2019-04-08 14:57 UTC, wolthera
Details
32bit float color artifacts appear on the stable branch (740.05 KB, application/x-zip-compressed)
2019-07-02 01:25 UTC, whoareyou7263
Details

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Description M 2019-02-09 10:44:36 UTC
Created attachment 117943 [details]
Exported image showing artifacts

I attached an image to illustrate. The .kra file is beyond the size limit. I only used paint and fill layers with normal blend mode.

Visual artifacts occur in the nightly appimage when painting in RGB 32-bit float - not however in 16f, 16i or 8i and also not in LAB, CYMK, XYZ or Grayscale in any combination. It is most obvious with a pixel engine brush using wide spacing, but also occurs with the particle brush and the tangent normal brush. The tangent normal brush seems to be an exception, here the artifacts seem to apply once per painted brush tip instead of aligning to the canvas. I didn't notice it with the shape, sketch or color smudge engines.

In 4.1.7 this problem didn't occur using the same file.

  Version: 4.2.0-pre-alpha (git b8d64d3)

Qt

  Version (compiled): 5.10.0
  Version (loaded): 5.10.0

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: linux
  Kernel Version: 4.20.7-1-MANJARO
  Pretty Productname: Manjaro Linux
  Product Type: manjaro
  Product Version: unknown

OpenGL Info
 
  Vendor:  NVIDIA Corporation 
  Renderer:  "GeForce GTX 860M/PCIe/SSE2" 
  Version:  "4.6.0 NVIDIA 415.27" 
  Shading language:  4.60 NVIDIA 
  Requested format:  QSurfaceFormat(version 3.0, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, colorSpace QSurfaceFormat::ColorSpace(DefaultColorSpace), profile  QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile)) 
  Current format:    QSurfaceFormat(version 4.6, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 0, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval 0, colorSpace QSurfaceFormat::ColorSpace(DefaultColorSpace), profile  QSurfaceFormat::OpenGLContextProfile(CompatibilityProfile)) 
     Version: 4.6
     Supports deprecated functions true 
     is OpenGL ES: false 

Hardware Information

  GPU Acceleration: auto
  Memory: 15951 Mb
  Number of Cores: 8
  Swap Location: /tmp
Comment 1 Halla Rempt 2019-02-09 10:46:37 UTC
As far as I know, nothing has changed in the normal blending mode or the 32 bits float rgb colorspace since 4.1... All the work for HDR hasn't even been merged yet. I haven't reproduced the issue yet, but I'll mark it as regression in any case.
Comment 2 wolthera 2019-04-08 14:57:36 UTC
Created attachment 119297 [details]
Shows errors made in 32bit float image.

I can reproduce this on

Krita

 Version: 4.2.0-pre-alpha (git c5838c0)
 Languages: en_US, en_GB, nl
 Hidpi: false

Qt

  Version (compiled): 5.12.0
  Version (loaded): 5.12.0

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: linux
  Kernel Version: 4.15.0-46-generic
  Pretty Productname: KDE neon User Edition 5.15
  Product Type: neon
  Product Version: 18.04
Comment 3 wolthera 2019-04-08 15:16:07 UTC
I thought I had set this to confirmed...
Comment 4 Tiar 2019-04-20 09:34:56 UTC
*** Bug 406400 has been marked as a duplicate of this bug. ***
Comment 5 Dmitry Kazakov 2019-05-24 13:33:09 UTC
Git commit d3e4c3aa299cf10a3ef167213f50799baba9c782 by Dmitry Kazakov.
Committed on 24/05/2019 at 13:32.
Pushed by dkazakov into branch 'krita/4.2'.

Disable AVX optimizations for 32-bit composite ops in Krita 4.2

They cause artifacts and we don't have a fix yet :(

M  +13   -3    libs/pigment/compositeops/KoCompositeOps.h

https://invent.kde.org/kde/krita/commit/d3e4c3aa299cf10a3ef167213f50799baba9c782
Comment 6 whoareyou7263 2019-07-02 01:25:30 UTC
Created attachment 121275 [details]
32bit float color artifacts appear on the stable branch

I've added the kritarc file, but I am not sure if this is the right configuration file Mr./Mrs. -tiar- was talking about. 

I have also added a Krita file with the problem in the title.
Here is the conversation: 
https://www.reddit.com/r/krita/comments/c6x7wr/these_lines_how_do_i_get_rid_of_them/

For the brushes that make this happen, I noticed that I could reproduce this with almost every default pixel brush, even custom made. I've also noticed that when I press hard on my pen to get the maximum opacity, the artifacts don't appear. In simple terms, the lighter the opacity the clearer the artifact gets. If I tap lightly to paint, it gets even clearer for the brushes with pen sensitivity. The Hard round brush w/o pen sensitivity settings have only light to no artifacts around its perimeter
Comment 7 whoareyou7263 2019-07-02 01:31:55 UTC
I forgot to mention in the "32bit float color artifacts appear on the stable branch" report. 

I run on MS windows 10 Pro 64-bit with 8 GB of ram.
Krita version: 4.2.2
My GPUs: Intel HD 530 and GTX950m
CPU: i5 6300HQ
Comment 8 whoareyou7263 2019-07-05 18:49:45 UTC
4.2.1 did not have any artifacts.
Comment 9 Tiar 2019-07-06 17:06:22 UTC
Git commit cd5450a851ed2183fbb7ea479365efc114e94c26 by Agata Cacko, on behalf of Dmitry Kazakov.
Committed on 06/07/2019 at 17:03.
Pushed by tymond into branch 'master'.

Disable AVX optimizations for 32-bit composite ops

They cause artifacts and we don't have a fix yet :(

Note from the committer:
This commit was initially made on krita/4.2 branch.
However between 4.2.1 and 4.2.2 the stable branch was
reconstructed, which caused all commits that were exclusively
on the previous krita/4.2 (and not on master) to be missing.

The previous commit hash: d3e4c3aa299cf10a3ef167213f50799baba9c782

Also regarding the artifacts: it never worked, optimization were
enabled during the creamy flow implementation, but they never should
be enabled until someone fix them properly.

M  +14   -3    libs/pigment/compositeops/KoCompositeOps.h

https://invent.kde.org/kde/krita/commit/cd5450a851ed2183fbb7ea479365efc114e94c26
Comment 10 Tiar 2019-07-06 17:10:26 UTC
The optimization never worked. They are disabled on master will be disabled on the stable branch as well, so users won't see it/won't have a problem.

I unassign myself from this bug report since I couldn't find a cause and I won't be working on it for now.
Comment 11 whoareyou7263 2019-07-07 16:02:18 UTC
(In reply to Tymond from comment #10)
> The optimization never worked. They are disabled on master will be disabled
> on the stable branch as well, so users won't see it/won't have a problem.
> 
> I unassign myself from this bug report since I couldn't find a cause and I
> won't be working on it for now.

Thank you for trying (^-^)
Your replies encouraged me to report bugs on Krita(#^^#)
Comment 12 Halla Rempt 2019-07-08 14:59:29 UTC
Git commit c4428e2a635a8c15385db882f1ffb1d29c102640 by Boudewijn Rempt, on behalf of Dmitry Kazakov.
Committed on 08/07/2019 at 14:59.
Pushed by rempt into branch 'krita/4.2'.

Disable AVX optimizations for 32-bit composite ops

They cause artifacts and we don't have a fix yet :(

Note from the committer:
This commit was initially made on krita/4.2 branch.
However between 4.2.1 and 4.2.2 the stable branch was
reconstructed, which caused all commits that were exclusively
on the previous krita/4.2 (and not on master) to be missing.

The previous commit hash: d3e4c3aa299cf10a3ef167213f50799baba9c782

Also regarding the artifacts: it never worked, optimization were
enabled during the creamy flow implementation, but they never should
be enabled until someone fix them properly.

M  +14   -3    libs/pigment/compositeops/KoCompositeOps.h

https://invent.kde.org/kde/krita/commit/c4428e2a635a8c15385db882f1ffb1d29c102640
Comment 13 Stig (Rakurri) 2020-03-14 22:45:21 UTC
Can confirm, this also happens on Windows 10 with both the 16-bit float/channel and 32-bit float/channel, using the 4.2.9-beta.
one of the brushes this happens with is j)_Waterpaint_Soft_Edges
Comment 14 Dmitry Kazakov 2021-01-13 13:10:41 UTC
Git commit 999cd22e73339a5f4747be45d68ca7f7d9850e34 by Dmitry Kazakov.
Committed on 13/01/2021 at 13:10.
Pushed by dkazakov into branch 'master'.

Recover AVX optimization for Float32 color spaces

The problem was in the fast-path branch which used wrong pixel type

Many thanks to Mathias Wein for tracking down this problem:
https://invent.kde.org/graphics/krita/-/commit/76c28d6a29f1b5d5d7df76d40deb9f9e97d9f21c

M  +3    -13   libs/pigment/compositeops/KoCompositeOps.h
M  +6    -5    libs/pigment/compositeops/KoOptimizedCompositeOpAlphaDarken128.h
M  +5    -5    libs/pigment/compositeops/KoOptimizedCompositeOpOver128.h

https://invent.kde.org/graphics/krita/commit/999cd22e73339a5f4747be45d68ca7f7d9850e34
Comment 15 Dmitry Kazakov 2021-01-13 13:11:21 UTC
Git commit a0494656a98d81ac269364dc2b45fb2841ecff3c by Dmitry Kazakov.
Committed on 13/01/2021 at 13:11.
Pushed by dkazakov into branch 'krita/4.3'.

Recover AVX optimization for Float32 color spaces

The problem was in the fast-path branch which used wrong pixel type

Many thanks to Mathias Wein for tracking down this problem:
https://invent.kde.org/graphics/krita/-/commit/76c28d6a29f1b5d5d7df76d40deb9f9e97d9f21c

M  +3    -13   libs/pigment/compositeops/KoCompositeOps.h
M  +6    -5    libs/pigment/compositeops/KoOptimizedCompositeOpAlphaDarken128.h
M  +5    -5    libs/pigment/compositeops/KoOptimizedCompositeOpOver128.h

https://invent.kde.org/graphics/krita/commit/a0494656a98d81ac269364dc2b45fb2841ecff3c