Declaration
type TIOTIFFCompression = (ioTIFF_UNCOMPRESSED, ioTIFF_CCITT1D, ioTIFF_G3FAX1D, ioTIFF_G3FAX2D, ioTIFF_G4FAX, ioTIFF_LZW, ioTIFF_OLDJPEG, ioTIFF_JPEG, ioTIFF_PACKBITS, ioTIFF_ZIP, ioTIFF_DEFLATE, ioTIFF_UNKNOWN);Description
| Value | Description | Supported Pixel Formats | Supports Alpha Channel? |
|---|---|---|---|
| ioTIFF_UNCOMPRESSED | Uncompressed TIFF | All | Yes |
| ioTIFF_CCITT1D | Bilevel Huffman compression | Black/White Only | No |
| ioTIFF_G3FAX1D | Bilevel Group 3 CCITT compression, mono-dimensional | Black/White Only | No |
| ioTIFF_G3FAX2D | Bilevel Group 3 CCITT compression, bi-dimensional | Black/White Only | No |
| ioTIFF_G4FAX | Bilevel Group 4 CCITT compression, bi-dimensional | Black/White Only | No |
| ioTIFF_LZW | LZW compression | All | Yes |
| ioTIFF_OLDJPEG | Ver 6.0 JPEG compression (unsupported) | True Color Images Only | No |
| ioTIFF_JPEG | JPEG compression | True Color Images Only | No |
| ioTIFF_PACKBITS | RLE compression | All | Yes |
| ioTIFF_ZIP | ZIP compression (non-TIFF standard) | All | No |
| ioTIFF_DEFLATE | Adobe ZIP compression (non-TIFF standard) | All | No |
| ioTIFF_UNKNOWN | Unknown compression |
For black/white compressions (ioTIFF_CCITT1D, ioTIFF_G3FAX1D, ioTIFF_G3FAX2D and ioTIFF_G4FAX) ensure that BitsPerSample = 1 and SamplesPerPixel = 1.
Examples
ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_G4FAX;ImageEnView1.IO.Params.BitsPerSample := 1;
ImageEnView1.IO.Params.SamplesPerPixel := 1;
ImageEnView1.IO.SaveToFile('D:\output.tif');
ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_JPEG;
ImageEnView1.IO.Params.TIFF_JPEGQuality := 85;
