Specifies the format to save an ImageEn layer file.
If CompressionFormat is -1, a lossless zlib compression format is used (preserving pixel format and alpha channel).
If CompressionFormat is -2, a non-compressed format is used (preserving pixel format and alpha channel).
Otherwise any standard image format can be used, except ioTIFF.
If you offset a value by 10000, e.g. 10000 + ioPNG, then non-transparent layers (e.g. background/layer 0) will be JPEG format, and the remaining layers the specified format. This is useful if you want maximum compression but need to maintain transparency.
Note: ◼If your image layers use an alpha channel, ensure IEN_Compression is -1, -2 or ioPNG ◼Even if a standard compression format, such as ioJPEG is used, the file will only be readable by ImageEn ◼ioPNG should not be used if you need compatibility with ImageEn versions that use ieenWIC ◼If ioJPEG compression is used, JPEG Quality is specified by IOParamDefaults (80, by default)
// Use PNG as the compression format ImageEnView1.IO.Params.IEN_Compression := ioPNG; ImageEnView1.IO.SaveToFileIEN('D:\Layers.ien');
// Use JPEG as the compression format (transparency will be lost) ImageEnView1.IO.Params.IEN_Compression := ioJPEG; IEGlobalSettings().IOParamDefaults.JPEG_Quality := 95; ImageEnView1.IO.SaveToFileIEN('D:\Layers.ien');
// Use PNG as the compression format for layers with transparency, otherwise use JPEG ImageEnView1.IO.Params.IEN_Compression := 10000 + ioPNG; IEGlobalSettings().IOParamDefaults.JPEG_Quality := 95; ImageEnView1.IO.SaveToFileIEN('D:\Layers.ien');
// Use internal compression format (transparency will be maintained) ImageEnView1.IO.Params.IEN_Compression := -1; ImageEnView1.IO.SaveToFileIEN('D:\Layers.ien');
// Use internal compression format for layers with transparency, otherwise use JPEG ImageEnView1.IO.Params.IEN_Compression := 10000 + -1; IEGlobalSettings().IOParamDefaults.JPEG_Quality := 95; ImageEnView1.IO.SaveToFileIEN('D:\Layers.ien');