/// Supported image types
///
/// - `x-partial-jpeg`: JPEG file without Tables/Misc chunk. It has to be defined in a
/// `DefineJpegTables` tag and injected in the first Start Of Frame (SOF) JPEG chunk.
/// - `x-ajpeg`: JPEG with alpha mask (see DefineJPEG3):
/// `x-ajpeg` :: `jpeg_size(uint16be)` `jpeg` `alpha`