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I frequently use software to clean up hand drawn art. 
I use red(or blue) sketch lines and then ink over them, similar to standard practices in comic illustration. 

In photoshop there is a relatively simple process to remove the red lines and in recent years a script to handle the whole process. 
How can I do this in Affinity Photo(or designer)?

Sample sketch attached.


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Hi atarashiidesu,


Open your image and Duplicate the Background layer, highlight the duplicate and select the Channels tab. Now click the eye icon (Visible) on composite Green,Blue and Alpha, your image will now only show the black ink.


Another way would be to simply convert it to Black & White, you can adjust the sliders, which may give a better result.


Hope this helps.



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Another way is.


Works in Designer.

iMac 27" Late 2015 Fully Loaded, iMac 27" Mid 2011 both running High Sierra 10.13.6 - Affinity Designer/Photo & Publisher - Illustrator CC, Inkscape, Blender, Sketchup, Pepakura Designer, MTC, Pixelmator & Pixelmator Pro + more... XP-Pen Artist-22E, - iPad Pro 12.9 B|  

Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions

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