Hello veryPDF,
[Question]
Our FAX cannot recognize TIFF image with Group 3 Fax (CCIT FAX3)
compression converted by easyPDF SDK.
As for Group 3 Fax (CCIT FAX3) compression, "Compression" tag should be
"3" and "Group3Options" tag has to be written in the TIFF data.
However the created TIFF image does not have Group3Options tag.
I assume that is why our FAX cannot recognize the TIFF image
as correct format of Group 3 Fax (CCIT FAX3) compression.
Is CCITT FAX GROUP3 supposed to output Class F compatible format?
=========================
PDF to Image SDK does support following compression methods,
#define COMPRESSION_NONE 1 /* dump mode */
#define COMPRESSION_CCITTRLE 2 /* CCITT modified Huffman RLE */
#define COMPRESSION_CCITTFAX3 3 /* CCITT Group 3 fax encoding */
#define COMPRESSION_CCITTFAX4 4 /* CCITT Group 4 fax encoding */
#define COMPRESSION_LZW 5 /* Lempel-Ziv & Welch */
#define COMPRESSION_JPEG 7 /* %JPEG DCT compression */
#define COMPRESSION_PACKBITS 32773 /* Macintosh RLE */
#define COMPRESSION_CLASSF 88888888
#define COMPRESSION_CLASSF196 88888889
#define COMPRESSION_CLASSF204X98_G3 88888886
#define COMPRESSION_CLASSF204X196_G3 88888887
#define COMPRESSION_CLASSF204X98_G4 88888888
#define COMPRESSION_CLASSF204X196_G4 88888889
COMPRESSION_CCITTFAX3 is can only compress TIFF file with CCITT Group 3 fax encoding, however, it can’t general ClassF compatible TIFF files, if you wish create ClassF compatible TIFF files, you need use following compression types,
COMPRESSION_CLASSF
COMPRESSION_CLASSF196
COMPRESSION_CLASSF204X98_G3
COMPRESSION_CLASSF204X196_G3
COMPRESSION_CLASSF204X98_G4
COMPRESSION_CLASSF204X196_G4
these compression types will able convert PDF file to ClassF compatible TIFF files, please refer to following example source code,
nResult = PDFToImageConverter(szPDFFileName,"C:\\204x98_g3.tif",NULL,NULL,200,200,1, COMPRESSION_CLASSF204X98_G3,100,FALSE,TRUE,-1,-1);
nResult = PDFToImageConverter(szPDFFileName,"C:\\204x196_g3.tif",NULL,NULL,200,200,1, COMPRESSION_CLASSF204X196_G3,100,FALSE,TRUE,-1,-1);
nResult = PDFToImageConverter(szPDFFileName,"C:\\204x98_g4.tif",NULL,NULL,200,200,1, COMPRESSION_CLASSF204X98_G4,100,FALSE,TRUE,-1,-1);
nResult = PDFToImageConverter(szPDFFileName,"C:\\204x196_g4.tif",NULL,NULL,200,200,1, COMPRESSION_CLASSF204X196_G4,100,FALSE,TRUE,-1,-1);
VeryPDF