optiPNG recursively

optiPNG is a command line convecting software, therefore optiPNG can be used to convert image files recursively by walking into the directory from the current directory.

The following is the batch file for recursively optipnging:

echo recursing
set pardir="%~dp0"
echo %pardir%
call %pardir%optipng.exe *.png
REM set /D+(*.*) for directory; set /R for walking from current directory
FOR /D /R %%a in (*.*) DO CALL :suboptipng "%%a"
echo optipng complete
pause
GOTO:EOF

:suboptipng e
cd /D "%1"
echo optipnging %1
call %pardir%optipng.exe *.png

By copying both the batchfile optiPNG.bat and the executefile optiPNG.exe to the same parent directory, and then double click the optiPNG.bat file to optiPNG all images file with extension .png. Other file extension of the supported format can also be added to the batch by adding corresponding lines.