ppmtosixel(1) on Linux
The text d04b14a365e6, as Debian 12 (Bookworm) shipped it.
convert a PPM image to DEC sixel format
Flags it lists
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The text d04b14a365e6, as Debian 12 (Bookworm) shipped it.
convert a PPM image to DEC sixel format
-margin
-raw