optpng

optpng.bat

@echo off

:mainloop
	if "%~1" == "" goto :eof
	call :optimize "%~1"
	shift
goto :mainloop

:optimize
	set a=%~a1
	if "%a:~0,1%" == "d" (
		for /r "%~1" %%i in ("*.png") do call :optimize "%%~i"
		goto :eof
	)

	set tmpfile="%temp%\optpngtmp-%random:~-1%%random:~-1%%random:~-1%%random:~-1%%random:~-1%.png"
	flaxc.exe "%~1" "%~1" -P256 -D4 -R1 > nul
	pngrewrite.exe "%~1" "%~1" 2> nul
	optipng.exe -o7 -quiet "%~1"
	pngout.exe "%~1" /y /q
	cpngc.exe "%~1" %tmpfile% > nul
	copy /y %tmpfile% "%~1"
	del %tmpfile%
goto :eof