I was requested to put in some drawings onto a website in such a way that the background image of the website showed through. At first I thought I needed to make jpgs with similar region of background, but this led to seams being visible at the edges of the jpg since the background was complex and not a single colour. Finally settled on png files with transparency.
For getting the line drawings to that state, first I thought about converting to vector format. Explored vectormagic.com but found that the free online version was too low res for my needs. Then came across this post - I needn't go the vector way, since the images I had were higher resolution than what I needed for the website. So, just used Select -> Color Range in Gimp, was able to select the line art alone without the white background, was able to paste it into a new transparent layer in Gimp, and could proceed from there.
For getting the line drawings to that state, first I thought about converting to vector format. Explored vectormagic.com but found that the free online version was too low res for my needs. Then came across this post - I needn't go the vector way, since the images I had were higher resolution than what I needed for the website. So, just used Select -> Color Range in Gimp, was able to select the line art alone without the white background, was able to paste it into a new transparent layer in Gimp, and could proceed from there.
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