Blend Layer Crop Mode
blend-crop
Selects which side of the blend layer image is kept when blend-fit crops it.
Valid values are top, bottom, left, and right.
Aliases: blendcrop, bc.
Use blend-crop[N] to target a specific blend layer, where N is 0–3. Layer 0 is either the bare blend-crop or blend-crop[0]; if both are supplied, the bare name wins.
Imgix Video runs no detectors on a blend layer. blend-crop=faces, entropy, edges, auto, a detection class, and fp all fall back to the center of the image.