Has anyone tried to make a mask or rather a black and white image for the purpose of a mask for GIMP?
How to do it?
You can copy and paste it into the layer mask, I think.
Or here is a luminosity mask tutorial, you can jump straight to the section where the masks are added based on the the previously created black-and-white versions:
Or did you mean using darktable to create such a BW image, so it can be used as a mask? You’d have to describe what you want the mask to do.
Open the image.
Duplicate layer.
Apply Color>Threshold.
Main point being that the GIMP Threshold gives a pure black and white image.
Adjust threshold sliders as required.
Edit/Invert if necessary.
- In dt create bw image and export as e.g. jpg. Of course you should export the same image as normal looking image.
- Open these images in GIMP
- Use bw version and use channel tab and use command „channel to selection”
- Next create mask with option „from selection” as a source of the mask
Indeed my question was - how to create very contrastly bw image still keeping small details like not focused tree branches/leafes?
Here’s a mask per my posted method:
Inverting it would allow image adjustment independently of the highlights.
If you export to tiff you can select the option to save the masks…you will get a layer for each module that used a mask…so you can just use whatever image you want make the mask in say exposure and bump the contrast and you will have a layer with your bw mask…I think that is what the option if for…
In Gimp
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