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Last active June 7, 2017 21:03
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Subpixel image resizing using imagemagick convert
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resize.sh
#!/bin/sh
convert ResizeTestImage.png -gamma 0.5 -filter Mitchell -resize 800x200! -morphology Convolve "3x1: 0.33, 0.34, 0.33" -channel Red -morphology Convolve "3x1: 0.0, 0.0, 1.0" -channel Green -morphology Convolve "3x1: 0.0, 1.0, 0.0" -channel Blue -morphology Convolve "3x1: 1, 0, 0" +channel -filter Point -resize 267x200! -gamma 2.0 -depth 8 ResizeTestSubpixel.png
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pavel-perina commented Jun 7, 2017 •
edited

Resize with subpixel accuracy (cleartype)
Based on i believe this thread http://www.imagemagick.org/discourse-server/viewtopic.php?t=19120 and here is the result of image downscaled from 800x600 to 267x200 pixels. Bottom image is for comparison.

result

I believe it's more suitable for vector graphics (fonts, graphs, ...) and photos seem to be more blurred

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