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<p>Hi Grant,</p>
<p>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. </p>
<p>Maybe this is what you want?</p>
<p>If you want more control over how exactly RGB values are rendered
based on your inputs, you could implement a custom raster
renderer.<br>
In our EnMAP-Box plugin, we have several examples, e.g. a
Bivariate Color Raster Renderer:<br>
<a class="moz-txt-link-freetext" href="https://enmap-box.readthedocs.io/en/latest/usr_section/usr_manual/tools.html#bivariate-color-raster-renderer">https://enmap-box.readthedocs.io/en/latest/usr_section/usr_manual/tools.html#bivariate-color-raster-renderer</a><br>
<a class="moz-txt-link-freetext" href="https://github.com/EnMAP-Box/enmap-box/blob/main/enmapbox/coreapps/bivariatecolorrasterrendererapp/bivariatecolorrasterrenderer.py">https://github.com/EnMAP-Box/enmap-box/blob/main/enmapbox/coreapps/bivariatecolorrasterrendererapp/bivariatecolorrasterrenderer.py</a></p>
<p>Regards<br>
Andreas<br>
<br>
</p>
<p><img src="cid:part1.CeQVWOsC.zehfySfe@geo.hu-berlin.de" alt=""></p>
<p><br>
</p>
<div class="moz-cite-prefix">Am 02.02.2026 um 13:21 schrieb Grant
Boxer via QGIS-User:<br>
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<p class="MsoNormal">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?<o:p></o:p></p>
<p class="MsoNormal">Cheers Grant<o:p></o:p></p>
<p class="MsoNormal">Perth WA<o:p></o:p></p>
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