ImageEn, unit iexBitmaps

TIOParams.TIFF_Compression

TIOParams.TIFF_Compression


Declaration

property TIFF_Compression: TIOTIFFCompression;


Description

Specifies the compression type for TIFF images.

Note:
 If you are using a TIEMultiBitmap or TImageEnMView, you can use DuplicateCompressionInfo to propogate the parameter to all frames
 If you are saving an image with an alpha channel, the compression must be set to ioTIFF_UNCOMPRESSED to preserve the alpha channel
 With ioTIFF_JPEG compression, specify the quality with TIFF_JPEGQuality

Default: ioTIFF_UNCOMPRESSED


Examples

// Save monochrome TIFF in G4 Fax format
ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_G4FAX;
ImageEnView1.IO.Params.BitsPerSample := 1;
ImageEnView1.IO.Params.SamplesPerPixel := 1;
ImageEnView1.IO.SaveToFile('D:\output.tif');


// Save TIFF as 32bit gray-scale (ie32f)
// Note: Compression must be: ioTIFF_UNCOMPRESSED, ioTIFF_LZW, ioTIFF_PACKBITS or ioTIFF_ZIP
ImageEnView1.LegacyBitmap := false;
ImageEnView1.IEBitmap.PixelFormat := ie32f;
ImageEnView1.IO.Params.BitsPerSample := 32;
ImageEnView1.IO.Params.SamplesPerPixel := 1;
ImageEnView1.IO.Params.TIFF_PhotometInterpret := ioTIFF_BLACKISZERO;
ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_UNCOMPRESSED;
ImageEnView1.IO.SaveToFileTIFF('D:\GrayTiff32.tiff');


// Save a PNG with alpha to TIFF
ImageEnView1.IO.LoadFromFile( 'D:\Alpha.png' );
ImageEnView1.IEBitmap.PixelFormat             := ie24RGB;
ImageEnView1.IO.Params.TIFF_PhotometInterpret := ioTIFF_RGB;
ImageEnView1.IO.Params.SamplesPerPixel        := 4;
ImageEnView1.IO.Params.BitsPerSample          := 8;
ImageEnView1.IO.Params.TIFF_Compression       := ioTIFF_UNCOMPRESSED;
ImageEnView1.IO.SaveToFile( 'D:\Alpha.TIFF' );


// Save with JPEG compression
ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_JPEG;
ImageEnView1.IO.Params.TIFF_JPEGQuality := 85;