sculpt vertex color painting wrong saturation and value #78201

New Issue

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-23 21:54, hash: 49234c15e2
Worked: (newest version of Blender that worked as expected)

Short description of error
[sculpt vertex color painting wrong saturation and value]

Exact steps for others to reproduce the error

create a subdivided sphere
Turn on shading mode to flat and color to vertex color
paint in sculpt mode with strengh 1, color of the brush set to hsv h-0.5 s-0.5 v-0.5
pick color from object, it will have different saturation and value ( color will be h- 0.5 s-0.271277 v-0.737255 )
[Based on the default startup or an attached .blend file (as simple as possible)]

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-23 21:54, hash: `49234c15e2` Worked: (newest version of Blender that worked as expected) **Short description of error** [sculpt vertex color painting wrong saturation and value] **Exact steps for others to reproduce the error** 1) create a subdivided sphere 2) Turn on shading mode to flat and color to vertex color 3) paint in sculpt mode with strengh 1, color of the brush set to hsv h-0.5 s-0.5 v-0.5 4) pick color from object, it will have different saturation and value ( color will be h- 0.5 s-0.271277 v-0.737255 ) [Based on the default startup or an attached .blend file (as simple as possible)]

Added subscriber: @Andruxa696

#78413 was marked as duplicate of this issue

Added subscribers: @PabloDobarro, @Jeroen-Bakker, @lichtwerk

Changed status from 'Needs Triage' to: 'Confirmed'

This is an issue when using the eyedropper from the color popover, I can confirm this.
The sample color operator works better {key S}.
I find it also confusing that when loading Vertex Colors into Sculpt Vertex Colors (loop_to_vertex_colors), Vertex Colors display differently from Sculpt Vertex Colors.

There are more general issues about the Color Picker, this is an ongoing discussion, see #41287, #69562, blender/blender-staging@6601a89650, 2b094be949#264914 and many others.
This is still not my playground though, so I will have to hand over to @PabloDobarro, @Jeroen-Bakker

Havent looked at code, not sure if Sculpt Vertex Colors are stored in the scene linear ref space? [think they should?]
And since the non-sculpt vertex painting does not suffer from this issue, I will confirm this.

This is an issue when using the eyedropper from the color popover, I can confirm this. The sample color operator works better {key S}. I find it also confusing that when loading Vertex Colors into Sculpt Vertex Colors (`loop_to_vertex_colors`), Vertex Colors display differently from Sculpt Vertex Colors. There are more general issues about the Color Picker, this is an ongoing discussion, see #41287, #69562, blender/blender-staging@6601a89650, 2b094be949#264914 and many others. This is still not my playground though, so I will have to hand over to @PabloDobarro, @Jeroen-Bakker Havent looked at code, not sure if Sculpt Vertex Colors are stored in the scene linear ref space? [think they should?] And since the non-sculpt vertex painting does not suffer from this issue, I will confirm this.

In #78201#964079, @lichtwerk wrote:
I find it also confusing that when loading Vertex Colors into Sculpt Vertex Colors (loop_to_vertex_colors), Vertex Colors display differently from Sculpt Vertex Colors.

Issue also came up in #78187

> In #78201#964079, @lichtwerk wrote: > I find it also confusing that when loading Vertex Colors into Sculpt Vertex Colors (`loop_to_vertex_colors`), Vertex Colors display differently from Sculpt Vertex Colors. Issue also came up in #78187

Added subscriber: @cheteron

This issue was referenced by db7d370657

This issue was referenced by db7d370657efa39a3bd69f057c8f405c17c41ac5

Changed status from 'Confirmed' to: 'Resolved'

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sculpt vertex color painting wrong saturation and value #78201