New answers tagged rgb
Try this: Hide the second layer Make the first layer grayscale Use edge detection filters to highlight edges of the background landscape Adjust levels and invert if necessary to get thin black lines on white background Show the second layer and switch it to MULTIPLY mode
GIMP 2.9 or higher Image > Precision > Linear Light GIMP 2.8 or lower Image > Mode > Convert to Color Profile... > Select color profile from disk... > sRGB-elle-V4-g10.icc You can obtain sRGB-elle-V4-g10.icc e.g. from here. Source I summarized what is discussed here as "radiometrically correct editing". Additional notes I tested ...
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