[Qgis-user] Hue and Brightness

[Andreas Janz]

Hi Grant,

with colour band, I guess you mean a single band mapped to a color ramp 
(Singleband pseudocolor)? If you scale your brightness band to 0-255 
range, you could use this as a transparency band.

Maybe this is what you want?

If you want more control over how exactly RGB values are rendered based 
on your inputs, you could implement a custom raster renderer.
In our EnMAP-Box plugin, we have several examples, e.g. a Bivariate 
Color Raster Renderer:
https://enmap-box.readthedocs.io/en/latest/usr_section/usr_manual/tools.html#bivariate-color-raster-renderer
https://github.com/EnMAP-Box/enmap-box/blob/main/enmapbox/coreapps/bivariatecolorrasterrendererapp/bivariatecolorrasterrenderer.py

Regards
Andreas


Am 02.02.2026 um 13:21 schrieb Grant Boxer via QGIS-User:
>
> How would I create a colour image with a hue and a brightness value? I 
> have a raster image with a colour band and  brightness band and 
> wondered how to blend these two bands?
>
> Cheers Grant
>
> Perth WA
>
>
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