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add a simple pixelation filter
remove ifilter.c and update mkfile
rename ifilter to cfilter
add blur(1) a simple blurring filter
avoid a call to loadmemimage/writememimage
use a single image format
handle image with CMAP8 chan properly
add shade and tint filters
fix factors applied to the wrong color components in grayscale filter
add color inversion filter
initial import