pt		CompressInfo (TFPWriterJPEG)
		CompressionQuality (TFPWriterJPEG)
	ro	FramesInfo (TFPCustomImageWriter)
	ro	FramesWritten (TFPCustomImageWriter)
		GrayScale (TFPWriterJPEG)
		ProgressiveEncoding (TFPWriterJPEG)
pt	ro	TheImage (TFPCustomImageHandler)
pt	ro	TheStream (TFPCustomImageHandler)