ImageMagick-BatchResize.bat

echo off

if [%1]==[] (
	echo No path given as parameter
	exit /b
) else (
	set basePath=%1
	set imPath="C:\Program Files\ImageMagick\7.0.10-Q16-HDRI\magick.exe"
)

set folderPathTif=%basePath%*.tif
set folderPathPng=%basePath%*.png
REM set folderPathJpg=%basePath%"*.jpg"
REM set folderPathJpeg=%basePath%"*.jpeg"

set folders=(%folderPathTif%, %folderPathPng%)


REM for %%f in (%folderPathTif%, %folderPathPng%, %folderPathJpg%) do (
for %%f in %folders% do (
	setlocal enabledelayedexpansion
	set ext=%%~xf
	
	REM ! indicated delayed expansion which causes the variable to contain the correct extension value
	if "!ext!"==".png" (
		echo PNG	%%~nf	
		REM do not use specific compression
		%imPath% "%%f" -channel RGBA -separate -resize 50%% -combine "%%f"
	)
	if "!ext!"==".tif" (
		echo TIFF	%%~nf	
		%imPath% "%%f" -channel RGBA -separate -resize 50%% -combine -compress lzw "%%f"
	)
	
	endlocal
)