Grease pencil: effect mask color and alpha mode causing problems #72500

New Issue

Ilari Männistö · 2019-12-17T08:00:23+01:00

Ilari Männistö commented

2019-12-17 08:00:23 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.30

Blender Version
Broken: version: 2.82 (sub 5), branch: master, commit date: 2019-12-13 20:35, hash: c6ba941339
Worked: (optional)

Short description of error
Using effects like Rim or Glow with a grease pencil object cause weird artifacts. The mask color in the Rim effect will not recognize a color-picked color and "Use Alpha Mode" in the Glow effect causes weird rims inside a fully opaque part of the picture.

Exact steps for others to reproduce the error

I have attached a file containing this picture.

In the screenshot w,e can see the effects that are having problems (at least these ones). The Mask Color in Rim effect will not leave the red text uncolored even if it is selected/colorpicked as the mask color. The same thing applies to the "Select Color" in the Glow effect. I haven't shown it in the screenshot since I wanted to show what kind of weird rim artifacts are produced by the effect when "Use Alpha Mode" is turned on. Intuitively at least it should just prevent the glow from bleeding to fully transparent areas. That's what the name sounds like but that isn't what's happening.

If you set the Glow mode from Luminance to Color and use the color picker to select the gray color of the tree, no glow is applied. Only after a minor tweaking of the value we, get the glow to work. The blender file is in Standard Color management mode, so I don't really know why the color picker values don't work like they should.
[Based on the default startup or an attached .blend file (as simple as possible)]
greasepencil-anomalies.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.30 **Blender Version** Broken: version: 2.82 (sub 5), branch: master, commit date: 2019-12-13 20:35, hash: `c6ba941339` Worked: (optional) **Short description of error** Using effects like Rim or Glow with a grease pencil object cause weird artifacts. The mask color in the Rim effect will not recognize a color-picked color and "Use Alpha Mode" in the Glow effect causes weird rims inside a fully opaque part of the picture. **Exact steps for others to reproduce the error** ![image.png](https://archive.blender.org/developer/F8228253/image.png) I have attached a file containing this picture. In the screenshot w,e can see the effects that are having problems (at least these ones). The Mask Color in Rim effect will not leave the red text uncolored even if it is selected/colorpicked as the mask color. The same thing applies to the "Select Color" in the Glow effect. I haven't shown it in the screenshot since I wanted to show what kind of weird rim artifacts are produced by the effect when "Use Alpha Mode" is turned on. Intuitively at least it should just prevent the glow from bleeding to fully transparent areas. That's what the name sounds like but that isn't what's happening. If you set the Glow mode from Luminance to Color and use the color picker to select the gray color of the tree, no glow is applied. Only after a minor tweaking of the value we, get the glow to work. The blender file is in Standard Color management mode, so I don't really know why the color picker values don't work like they should. [Based on the default startup or an attached .blend file (as simple as possible)] [greasepencil-anomalies.blend](https://archive.blender.org/developer/F8228270/greasepencil-anomalies.blend)

Ilari Männistö commented

2019-12-17 08:00:23 +01:00

Added subscriber: @Lattapotta

Antonio Vazquez commented

2019-12-17 16:25:55 +01:00

Added subscriber: @antoniov

Antonio Vazquez commented

2019-12-17 16:25:55 +01:00

There is a refactor task in progress for the Drawing Engine to solve all these issues.

Philipp Oeser commented

2019-12-19 21:42:45 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-12-19 21:42:45 +01:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2019-12-19 21:42:45 +01:00

Philipp Oeser self-assigned this 2019-12-19 21:42:45 +01:00

Philipp Oeser commented

2019-12-19 21:42:45 +01:00

@Lattapotta : thx for the report, this is being solved in https://developer.blender.org/diffusion/B/history/greasepencil-refactor/.
So these things are all known issues atm but devs are aware and are working actively on them.

@antoniov : I think we can archive this report for the time being [will do that if you dont have objections]?
We can always reopen once the greasepencil-refactor branch has been merged and issues remain...

@Lattapotta : thx for the report, this is being solved in https://developer.blender.org/diffusion/B/history/greasepencil-refactor/. So these things are all known issues atm but devs are aware and are working actively on them. @antoniov : I think we can archive this report for the time being [will do that if you dont have objections]? We can always reopen once the greasepencil-refactor branch has been merged and issues remain...

Ilari Männistö commented

2019-12-20 02:03:57 +01:00

Yes, I don't think this is a very important bug in itself and there are manual workarounds for those circumstances. ;)

Antonio Vazquez commented

2019-12-20 08:49:14 +01:00

All these bugs are being fixed in the Draw Engine refactor.

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Grease pencil: effect mask color and alpha mode causing problems #72500