[Grease Pencil] Overlay, subtract, multiply and divide Layer Blend modes don't blend right #65187

New Issue

Mooly Segal · 2019-05-27T16:43:30+02:00

Mooly Segal commented

2019-05-27 16:43:30 +02:00

System Information
Operating system: Windows-8.1-6.3.9600 64 Bits
Graphics card: GeForce GTX 750/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13

Blender Version
Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-26 22:34, hash: d525c76003
Worked: (optional)

Short description of error
Overlay, subtract, multiply and divide Layer Blend modes in for the Grease Pencil don't blend right. When I draw a white line in Overlay Blend Mode over a 60% grey area, some areas of the white line become dark instead of losing opacity (see image attached). When adjusting the opacity, the problem becomes more visible and the stroke flickers when the opacity is close to 0.0.

overlay_bug.blend
Exact steps for others to reproduce the error

Start a new 2D Animation scene
In the material tab create a grey fill material with a color value of 0.6.
In the material tab create a white stroke material with a value of 1.
Draw a simple square shape in the Fills layer with the Grey Fill Material.
Draw a few lines withe the White Stroke Material, on top of the square in the Lines layer.
Change the Blend mode of the Lines layer to Overlay.
Change the Opacity of the Lines Layer to different values including 0.0, 0.01, 0.5, 1.
Observe the white line in the view port.

NOTE
This problem shows in render too.
Blender file attached.

Thank you!

**System Information** Operating system: Windows-8.1-6.3.9600 64 Bits Graphics card: GeForce GTX 750/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13 **Blender Version** Broken: version: 2.80 (sub 72), branch: blender2.7, commit date: 2019-05-26 22:34, hash: `d525c76003` Worked: (optional) **Short description of error** Overlay, subtract, multiply and divide Layer Blend modes in for the Grease Pencil don't blend right. When I draw a white line in ***Overlay Blend Mode*** over a 60% grey area, some areas of the white line become dark instead of losing opacity (see image attached). When adjusting the opacity, the problem becomes more visible and the stroke flickers when the opacity is close to 0.0. [overlay_bug.blend](https://archive.blender.org/developer/F7072212/overlay_bug.blend) **Exact steps for others to reproduce the error** - Start a new 2D Animation scene - In the material tab create a grey fill material with a color value of 0.6. - In the material tab create a white stroke material with a value of 1. - Draw a simple square shape in the **Fills** layer with the Grey Fill Material. - Draw a few lines withe the White Stroke Material, on top of the square in the Lines layer. - Change the Blend mode of the Lines layer to Overlay. - Change the Opacity of the Lines Layer to different values including 0.0, 0.01, 0.5, 1. - Observe the white line in the view port. **NOTE** This problem shows in render too. Blender file attached. Thank you! ![Capture.JPG](https://archive.blender.org/developer/F7072221/Capture.JPG)

Mooly Segal commented

2019-05-27 16:43:30 +02:00

Added subscriber: @Moolys

Mooly Segal commented

2019-05-27 16:45:36 +02:00

This is what a similar setup with an overlay layer looks like in Photoshop:

This is what a similar setup with an overlay layer looks like in Photoshop: ![overlay_photoshop.jpg](https://archive.blender.org/developer/F7072244/overlay_photoshop.jpg)

Antonio Vazquez commented

2019-05-27 16:54:16 +02:00

Added subscriber: @antoniov

Antonio Vazquez commented

2019-05-27 16:54:16 +02:00

@Moolys are you talking about the sections when the stroke intersect itself?

Mooly Segal commented

2019-05-27 17:00:23 +02:00

@antoniov actually the tips of the stroke is where it's mostly visible. The tips look black, and they should blend into the grey (i.e. get darker slightly but not turn black).
Kind of looks like an alpha channel issue, but that's just a guess.

@antoniov actually the tips of the stroke is where it's mostly visible. The tips look black, and they should blend into the grey (i.e. get darker slightly but not turn black). Kind of looks like an alpha channel issue, but that's just a guess.

Antonio Vazquez self-assigned this 2019-05-28 13:29:40 +02:00

blender-admin commented

2019-05-28 15:55:17 +02:00

This issue was referenced by f139caa632

This issue was referenced by f139caa6322fc71a16f9c22f4202d6dde42573a7

Antonio Vazquez commented

2019-05-28 15:55:42 +02:00

Changed status from 'Open' to: 'Resolved'

Antonio Vazquez closed this issue

2019-05-28 15:55:42 +02:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

[Grease Pencil] Overlay, subtract, multiply and divide Layer Blend modes don't blend right #65187