Comments (1)
jcupitt
commented on June 1, 2024
Hi @DDoS,
I think enlarging the output would mean that a pixel could be written more than once at overlaps, which wouldn't work.
You need a dither algorithm with limited context, ie. each output pixel can be computed from a bounded set of input pixels, ie. you have some term that stops errors being diffused too far. Now you can just enlarge the input by the appropriate amount and compute the output area.
libvips has a built-in dither, I guess you saw? If you save a GIF or an 8-bit PNG it'll be dithered for you:
vips copy nina.jpg x.png[palette,bitdepth=4]
To make a 16-colour dithered PNG:
from libvips.
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from libvips.