A Powershell script that transforms a set of 128x96px tiles by converting black and magenta to transparent, then adding extra spacing between each tile

transform_tilesets.ps1

# I'm an ImageMagick newbie and don't know/care enough to make this performant
# I made this for working with this isometric walls pack: https://screamingbrainstudios.itch.io/isowallpack

foreach ($name in Get-ChildItem -Recurse -Filter *.png | ForEach-Object FullName) {
    # convert magenta and black to transparent
    mogrify -transparent "rgb(255,0,255)" $name;
    mogrify -transparent "rgb(0,0,0)" $name;
    
    # add 64px of spacing along the X-axis, and 32px along the Y-axis
    convert $name  -background None `
        -crop 128x0 +repage -splice 64x0 +append `
        -crop 0x96 +repage -splice 0x32 -append `
        $name;

    # add some extra padding around the edge of the image
    convert $name -gravity east -background None -splice 64x0 $name;
    convert $name -gravity south -background None -splice 0x64 $name;
}