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select all blacks in blue channel?


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hi I'm doing some texture work and I need to select all blacks in my blue channel but I can't find a good way for it without changing other channels.

in Photoshop it was supper easy (go to blue channel and select color range) but I can't wrap my head around it in affinity photo. I select all blacks in blue but when I change them all other channels get affected somehow?!

Here is a sample:

 

image.png.2a897d107a387b59d3139dc518251cf0.png

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