再網路上一直沒找到較完整的Image.RawFormat所讀出來的格式與圖片格式的對應碼，所以在這邊就試著將找到的資訊整理一下。
ImageFormatUndefined := "{B96B3CA9-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatMemoryBMP := "{B96B3CAA-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatBMP := "{B96B3CAB-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatEMF := "{B96B3CAC-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatWMF := "{B96B3CAD-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatJPEG := "{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatPNG := "{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatGIF := "{B96B3CB0-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatTIFF := "{B96B3CB1-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatEXIF := "{B96B3CB2-0728-11D3-9D7B-0000F81EF32E}"
ImageFormatIcon := "{B96B3CB5-0728-11D3-9D7B-0000F81EF32E}"
ImageCodecBMP := "{557CF400-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecJPG := "{557CF401-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecGIF := "{557CF402-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecEMF := "{557CF403-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecWMF := "{557CF404-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecTIF := "{557CF405-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecPNG := "{557CF406-1A04-11D3-9A73-0000F81EF32E}"
ImageCodecICO := "{557CF407-1A04-11D3-9A73-0000F81EF32E}"
; JPEG
EncoderTransformation := "{8D0EB2D1-A58E-4EA8-AA14-108074B7B6F9}"
EncoderQuality := "{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"
EncoderLuminanceTable := "{EDB33BCE-0266-4A77-B904-27216099E717}"
EncoderChrominanceTable := "{F2E455DC-09B3-4316-8260-676ADA32481C}"
; TIFF
EncoderCompression := "{E09D739D-CCD4-44EE-8EBA-3FBF8BE4FC58}"
EncoderColorDepth := "{66087055-AD66-4C7C-9A18-38A2310B8337}"
EncoderSaveFlag := "{292266FC-AC40-47BF-8CFC-A85B89A655DE}"