Chroma Key Node processing bogus #45793

New Issue

Michael Soegtrop · 2015-08-13T22:22:13+02:00

Michael Soegtrop commented

2015-08-13 22:22:13 +02:00

System Information
Debian 8, nVidia GTX970

Blender Version
2.74

Short description of error
The matte created by the chroma key node is far away from expectations. As a test case I used a HSV color wheel. The expectation is that the chroma key filters out a sector of this color circle. Instead the result is all sorts of strange curves (depending on key color) through the color circle. E.g. for green it is a line through the center also including the inverse color of green. For other colors it is some U shape in the color space.

Exact steps for others to reproduce the error
Create am image node with a HSV color wheel, feed this into a chroma key node and look at the result.

Sample blender file:
http://www.pasteall.org/blend/37548

Screenshot
http://www.pasteall.org/pic/91895

Best regards,

Michael

**System Information** Debian 8, nVidia GTX970 **Blender Version** 2.74 **Short description of error** The matte created by the chroma key node is far away from expectations. As a test case I used a HSV color wheel. The expectation is that the chroma key filters out a sector of this color circle. Instead the result is all sorts of strange curves (depending on key color) through the color circle. E.g. for green it is a line through the center also including the inverse color of green. For other colors it is some U shape in the color space. **Exact steps for others to reproduce the error** Create am image node with a HSV color wheel, feed this into a chroma key node and look at the result. Sample blender file: http://www.pasteall.org/blend/37548 Screenshot http://www.pasteall.org/pic/91895 Best regards, Michael

Michael Soegtrop commented

2015-08-13 22:22:13 +02:00

Changed status to: 'Open'

Michael Soegtrop commented

2015-08-13 22:22:13 +02:00

Added subscriber: @msoegtrop-3

Bastien Montagne commented

2015-08-14 13:01:07 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2015-08-14 13:01:07 +02:00

Please always attach files here, and do not use volatile storage like pasteall.org!

ChromaKey.blend

Indeed, chromakey seems to only behave as expected in the cyan and yellow areas… Unless I miss some important point about that node!

Please always attach files here, and do not use volatile storage like pasteall.org! ![ChromaKey_Screenshot.png](https://archive.blender.org/developer/F224315/ChromaKey_Screenshot.png) [ChromaKey.blend](https://archive.blender.org/developer/F224317/ChromaKey.blend) Indeed, chromakey seems to only behave as expected in the cyan and yellow areas… Unless I miss some important point about that node!

Michael Soegtrop commented

2015-08-15 00:05:18 +02:00

Dear Bastien,

sorry, this tiny upload file button is way to fancy to find ... But next time I know.

Best regards,

Michael

Dear Bastien, sorry, this tiny upload file button is way to fancy to find ... But next time I know. Best regards, Michael

blender-admin commented

2015-08-26 08:49:34 +02:00

This issue was referenced by 207c360900

This issue was referenced by 207c360900ca2346fd01f32a8ded88fcdd5ec39f

Campbell Barton commented