$asset->bw()
Converts the image to black and white
$asset->bw(): Kirby\Cms\FileVersion|Kirby\Cms\FileReturn type
Kirby\Cms\FileVersion|Kirby\Cms\File
Converts the image to black and white
$asset->bw(): Kirby\Cms\FileVersion|Kirby\Cms\FileKirby\Cms\FileVersion|Kirby\Cms\File