How to extract color mask from texture?

[egorodet]

How would I extract a mask of some color range from input RGB texture?

[otto-link]

I think the node TextureSplitChannels should do the trick:

[otto-link]

I got it wrong, that's indeed a different need and there is no built-in node for that. I could add a kind of TextureSelectColor node to extract a color mask using a color picker with some tolerance. What do you think?

If you need to work on this right now, it's tedious but you can select the texture color in Gimp and paint it red, green or blue... but it's not optimal in terms of workflow

[egorodet]

I'm trying to automate the workflow as much as possible and since "World Cover" map contains some custom/predefined colors for surface types, I need to extract these colors to masks automatically. The need to change colors in Editor would break the automation workflow and limit the number of surface types to 3 or 4. It would be great to have such node as TextureSelectColor, which would allow to extract mask of particular color with some tolerance! Thank you for your attention to my requests!

[otto-link]

I'll look into it, it should not be too complicated -> #577

[otto-link]

I added the node, the patch version is available on sourceforge: https://sourceforge.net/projects/hesiod/files/v0.5.2/hesiod.v0.5.2_20260430_git1d7b27.zip/download

[egorodet]

Thank you very much!

[egorodet]

@otto-link By the way, is it possible to convert mask to texture and pass it to Export node?

[otto-link]

Yes, you got two options:

• the mask can directly be exported to a png file for instance using the ExportHeightmap node. The node is going to convert it to an image file
• or, you can use the HeightampToRGBA node. Connect your mask to the R, G and B inputs (leave A disconnected) and the output will be a (gray) texture corresponding to the mask