$file->grayscale()
Alias for File::bw()
$file->grayscale(): Kirby\Cms\FileVersion|Kirby\Cms\File|Kirby\Filesystem\Asset
Return types
Kirby\Cms\FileVersion
orKirby\Cms\File
orKirby\Filesystem\Asset
This method modifies the existing $file
object it is applied to and returns it again.