APNG_DISPOSE_OP_PREVIOUS

<p>Before a new frame is rendered, the region is restored to what it was before the previous frame.</p>

Convert several png files into an animated png file.
This package exports only a single function `apng'. Call the
apng function with a vector of file names (which should be
png files) to convert them to a single animated png file.

Quinten Stokkink

APNG_DISPOSE_OP_PREVIOUS: Keep previous frame in rendering region

Description

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