Alpha Handling Action
The alpha handling modification handles alpha channels (transparency) in images, so transparency in PNG is handled when converted into JPG (which has no transparency).
Property  | Value  | Details  | 
kind  | AlphaHandlingAction  | |
alphaHandling  | Enum: "DiscardAlpha" "ReplaceAlpha" "ReplaceInvertedAlpha"  | Discard Alpha – alpha channel is discarded from the output Replace Alpha – alpha channel is replaced with the defined color Replace Inverted Alpha – inverted alpha channel is replaced with the defined color  | 
replacementRgbColorHexCode  | 0xFF0000  | Define a color the alpha channel should be replaced with (0xFFFFFF for white). This option is only necessary for ReplaceAlpha and ReplaceInvertedAlpha.  |