TIOParams.PDF_Compression

Declaration

property PDF_Compression: TIOPDFCompression;

Description

Specifies the compression filter for image saved in an Adobe PDF file.

Notes:
- This property is only used when saving PDF files natively, e.g. using TImageEnIO.SaveToFilePDF or TImageEnMIO.SaveToFilePDF (and the PdfViewer is disabled). It is NOT used when saving with PDFium
- If your image is monochrome (BitsPerSample and SamplesPerPixel = 1) and you specify compression as ioPDF_JPEG, it will be set to ioPDF_G3FAX2D
- If you are using a TIEMultiBitmap or TImageEnMView, you can use DuplicateCompressionInfo to propogate the parameter to all frames
- For ioPDF_JPEG compression, you can specify the JPEG quality and other properties using: JPEG_Quality, JPEG_Smooth, JPEG_ColorSpace, JPEG_DCTMethod, JPEG_OptimalHuffman

Default: ioPDF_G4FAX (if the image is color, it will default to ioPDF_UNCOMPRESSED)

Examples

// Convert monochrome TIFF to PDF
ImageEnView1.IO.LoadFromFile('D:\input.tif');
ImageEnView1.IO.Params.PDF_Compression := ioPDF_G4FAX;
ImageEnView1.IO.SaveToFile('D:\output.pdf');

// Convert full color PNG to PDF
ImageEnView1.IO.LoadFromFile('D:\input.png');
ImageEnView1.IO.Params.PDF_PaperSize := iepA4;
ImageEnView1.IO.Params.PDF_Compression := ioPDF_Jpeg;
ImageEnView1.IO.Params.JPEG_Quality := 90;
ImageEnView1.IO.Write('D:\out.pdf');

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