Also, if you're in 32-bit Linear, what constitutes highlight detail will differ from 16-bit Nonlinear, so you may not find all the stars are successfully selected. You can also use Select>Tonal Range>Highlights to make the initial selection, but you get less flexibility as there's no Tolerance option. The only time I've needed to use 16-bit is when creating a synthetic flat frame to combat gradients/skyglow etc. This might take a couple of minutes to complete if you're working in 32-bit-which you should be! Not sure if you're aware but Affinity Photo can use practically all of its tools, filters, adjustments etc in 32-bit, so there's no need to tone stretch then flatten and convert to 16-bit. Grow the selection by what is appropriate (I ended up with 16px for my image) and check the Circular option for nice round selection marquees around the stars.įinally, go to Edit>Inpaint and the stars will be removed. Once you've made the selection by clicking Apply, go to Select>Grow/Shrink. Also, you may want to try switching the colour model from RGB to Intensity, as stars will typically be the brightest parts of the image. I believe you can approximate the Photoshop workflow by using Select>Select Sampled Colour. Click on the middle of a star, then adjust Tolerance to select the rest (you might have to go up to 100%). Good old Astrobackyard, been following Trevor since the start of this year as I've gotten into astrophotography!
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