check the integrity of PNG files
pngcheck basically checks png files for corruption
png-fix-IDAT-windowsize repairs minor zlib header breakage
	from an older libpng
pngsplit breaks a png into constituent

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: https://www.libpng.org/pub/png/apps/pngcheck.html
