Maniphest T69946

GP layer multiply blending mode gives unpredictable results.
Closed, Duplicate
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Assigned To
None
Authored By
Ivan Cappiello (icappiello)
Sep 16 2019, 2:56 PM
Tags
  • BF Blender
Subscribers
Antonio Vazquez (antoniov)
Ivan Cappiello (icappiello)
Philipp Oeser (lichtwerk)

Description

System Information
Operating system: Darwin-18.7.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 570 OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.11.20

Blender Version
Broken: version: 2.81
Worked: (optional)

Short description of error
GP layer multiply blending mode gives unpredictable results. The blending mode seems to work differently when overlaying the canvas rather than the underlaying layer. Using the layer opacity slider will work correctly only on areas that are not overlapping other layer fills. When an underlaying fill layer is present moving the opacity slider toward ero will have mostly no-effect until it pops out to 0 when closest values are approaching.

multiply + opacity 1.0

multiply + opacity 0.5

multiply + opacity 0.15

multiply + opacity 0.01

Exact steps for others to reproduce the error
open attached blend file and use the layer opacity slider

GP_multiply_opacity.blend852 KBDownload

Related Objects

Event Timeline

Ivan Cappiello (icappiello) created this task.Sep 16 2019, 2:56 PM
Antonio Vazquez (antoniov) added subscribers: Philipp Oeser (lichtwerk), Antonio Vazquez (antoniov).Sep 16 2019, 3:22 PM

We have a task for these issues already: https://developer.blender.org/T66293

@Philipp Oeser (lichtwerk) I think you can merge both.

Germano Cavalcante (mano-wii) closed this task as a duplicate of T66293: GPencil: Redesign Blend modes and cleanup Drawing Engine.Sep 30 2019, 4:01 PM