Blend Layer Displacement Map
blend-displace
Supplies a displacement map image, stretched over the picture, that moves the blend layer’s pixels. The map’s red channel moves the layer horizontally and its green channel moves it vertically, with 127 as the neutral value.
The distance a code of 0 moves the layer is set by blend-displace-x and blend-displace-y.
?fm=mp4&blend=logo.png&blend-displace=map.png&blend-displace-x=40A JPEG, PNG, WebP or TIFF map is used as stored. A HEIC or AVIF map is turned upright the same way a HEIC or AVIF layer image is.
Use blend-displace[N] to target a specific blend layer, where N is 0–3. Layer 0 is either the bare blend-displace or blend-displace[0]; if both are supplied, the bare name wins.