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Color display in Node Editor is not corresponding to its RGB values in Cycles
Closed, InvalidPublic

Description

System Information
Operating system: Windows 7 64-bit
Graphics card: Intel(R) HD Graphics

Blender Version
Broken: Blender 2.78c

Short description of error
The title: Color display in Node Editor is not corresponding to its RGB values in Cycles.

Exact steps for others to reproduce the error

  1. File > New
  2. Change the Engine to Cycles Render
  3. Go to Node Editor
  4. Check Use Nodes
  5. Press Shift+A > Go to Input > Choose RGB; then place the new RGB node to a location you like
  6. Click the rectangular color that shows the RGB values
  7. Change the R to 0.750, the G to 0.500 and the B to 0.250
  8. Run Photoshop to take a screenshot of Blender (Print Screen) by pasting it in Photoshop
  9. In Photoshop, use the Eyedropper Tool (Or press the I Key) to pick the rectangular color in the RGB node
  10. In Photoshop, go to the color window then remark that you have: R 225, G 188, B 137
  11. Bug:
    • R: 0.750*255=191.25 which is not equal to R 225
    • G: 0.500*255=127.5 which is not equal to G 188
    • B: 0.250*255=63.75 which is not equal to B 137
    • Problem: The bug affects to a material color too, for example: Try to test the bug on an object's diffuse color, then the rendered of the object shows the bug that the color is lighter than it should be.

Details

Type
Bug

Event Timeline

Brecht Van Lommel (brecht) closed this task as Invalid.
Brecht Van Lommel (brecht) claimed this task.

Cycles works in a linear color space for physically based rendering, while Photoshop works in different color spaces like sRGB. See here for some info:
https://docs.blender.org/manual/en/dev/render/post_process/color_management.html#scene-linear-color-space