...

• null: means cancel transform execution (do not return any image)

• json object or json array: a command set to apply

• empty json object or empty json array: continue process

JSON object properties

• filter: the file selector

• if: action to do file matches the selector

• else: action to do file doesn’t match the selector

simplified syntax parameters

Not supported.

array type parameters

[filter]: if matches the filter, continue, else cancel

[filter, action]: if matches the filter, do the action, else cancel

[filter,actionIf,actionElse]: if matches the filter, do the actionIf, else do actionElse

string type parameter

Not supported.