Ugly Artifacts on Laptop with Alder Lake-P Graphics

I just switched to a new laptop and youch are these ugly! Any ideas at all?

I am running:

  • Ubuntu 22.04
  • ThinkPad T16 Gen 1 Intel
  • Intel Corporation Alder Lake-P Integrated Graphics Controller (rev 0c)
  • Intel I7-1260P

These things don’t change the behavior:

  • RawTherapee 5.8.whatever (recent dev builds) or 5.9 RC1
  • X11 or Wayland
  • Power cycling
  • Enabling/disabling Gnome Desktop color profiles for the screen

It seems to show up when I add the Local Adjustments Sharpening tool to a spot but this is clearly not a problem with RawTherapee because I never saw this on my old laptop (which had an Nvidia card)

I can confirm the bad behavior with both a JPEG and RAW file. This seems an unwanted interplay between the Contrast by Detail Levels and the Sharpening module for Local Adjustments. The effect gets progressively worse by increasing the contrast in CbDL.

@jdc Are you able to take a look at what is going on?

Edit: it only happens in “Before Black-and-White” mode.

I will have a look.

This is probably a very old bug.

I think I can work around the problem quite easily, but not solve the basic problem which must be an incompatibility…

I think it can wait until 5.9 is released. I can do a PR for 6.0
@Thanatomanic : What do you think ?

jacques

Thanks for looking into it Jacques. It might be something as easy as a 0-value somewhere after CBDL that does not work well with the sharpening module.

I think now would be the ideal time to fix a bug so that we can ship 5.9 with one bug less :slight_smile:

I have create a PR

to avoid bad behavior…

We can push this PR for 5.9 or wait for after 5.9.1… 6.0

Jacques

Thanks folks. I’m glad that a) I can keep editing photos on this spiffy new laptop and b) I’m not imagining things.

– Art Z.

Hello

I have push the change to “dev”, yesterday

Jacques

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