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GrayPictureFormatsEnum enumeration constants define the image formats or compression algorithms to be used when saving gray images. 
typedef enum {
 GPF_Jpeg = 0x00000001,
 GPF_Zip  = 0x00000002,
 GPF_LZW  = 0x00000004,
 GPF_J2K  = 0x00000008,
 GPF_Png  = 0x00000010,
 GPF_Auto = 0x00000020
} GrayPictureFormatsEnum;

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Elements

NameDescription
GPF\_AutoThe format is determined automatically depending on the output file format and settings.
GPF\_J2KGray JPEG 2000 format.

Note: The value is not available for PDF/A-1, RTF, DOCX, ODT, HTML, PPTX, FB2 and EPUB formats.
GPF\_JpegGray JPEG format.
GPF\_LZWLZW compression algorithm for gray images.

Note: The value is not available for PDF/A, RTF, DOCX, ODT, HTML, PPTX, FB2 and EPUB formats.
GPF\_PngGray PNG format.

Note: The value is not available for PDF, PDF/A formats.
GPF\_ZipZIP compression algorithm for gray images.

Note: The value is not available for RTF, DOCX, ODT, HTML, PPTX, FB2 and EPUB formats.

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Used in

IPDFPictureCompressionParams::GrayPictureFormats IPictureExportParams::GrayPictureFormats