ImageMagick-BatchResizeRecursive.bat

echo off

if [%1]==[] (
	echo No path given as parameter
	exit /b
) else (
	set basePath=%1
)

REM Optional second parameter to point to ImageMagick executable
if [%2]==[] (
	set imPath="C:\Program Files\ImageMagick\7.0.10-Q16-HDRI\magick.exe"
) else (
	set imPath=%2
)

set folders=(*.tif, *.tiff, *.png, *.jpg, *.jpeg)


REM for %%f in (%folderPathTif%, %folderPathPng%, %folderPathJpg%) do (
for /R %basePath% %%f in %folders% do (
	setlocal enabledelayedexpansion
	set ext=%%~xf
	set name=%%~nf
	
	REM ! indicated delayed expansion which causes the variable to contain the correct extension value
	if "!ext!"==".png" (
		echo PNG	!name!	
		%imPath% "%%f" -resize 50%% "%%f"
	)
	if "!ext!"==".jpg" (
		echo JPG	!name!	
		%imPath% "%%f" -resize 50%% "%%f"
	)
	if "!ext!"==".jpeg" (
		echo JPG	!name!	
		%imPath% "%%f" -resize 50%% "%%f"
	)
	if "!ext!"==".tif" (
		echo TIFF	!name!	
		%imPath% "%%f" -channel RGBA -separate -resize 50%% -resize 1024x1024^> -combine -compress lzw "%%f"
	)
	if "!ext!"==".tiff" (
		echo TIFF	!name!	
		%imPath% "%%f" -channel RGBA -separate -resize 50%% -resize 1024x1024^> -combine -compress lzw "%%f"
	)
	endlocal
)