Hi, we are using your pdf2img command line utility and we have a problem when we specify grayscale when converting from pdf to tif. When we fax the tif it does not come out (we just get a black bar on top). I noticed when using tiffinfo against the file that the resolution is not correct.
This is our syntax to convert:
C:\>c:\pdf2image_cmd\pdf2img.exe -multipage -gray -compress 3 -xres 204 -yres 196 -w 1728 -h 2156 c:\temp\img-X24120122-0001.pdf c:\temp\graytest.tif
This is the information about the tif:
Subfile Type: multi-page document (2 = 0x2)
Image Width: 1728 Image Length: 2156
Resolution: 96, 96 pixels/inch ====WRONG!
Bits/Sample: 1
Compression Scheme: CCITT Group 4
Photometric Interpretation: min-is-white
FillOrder: msb-to-lsb
Orientation: row 0 top, col 0 lhs
Samples/Pixel: 1
Rows/Strip: 2156
Planar Configuration: single image plane
Page Number: 0-1
PageName: Page 1
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The resolution should be 204x196 as specified in our command. Please tell us if this can be fixed. Thank you.
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I also noticed that the compression scheme is also wrong-
Compression Scheme: CCITT Group 4
When it should be : Compression Scheme: CCITT Group 3
Please let me know if this can be fixed. Thank you.
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PDF to Image Converter does support following comparession formats,
-compress <int> : set compression to TIFF format:
-compress 1 : NONE compression
-compress 2 : CCITT modified Huffman RLE
-compress 3 : CCITT Group 3 fax encoding (1d)
-compress 4 : CCITT Group 4 fax encoding
-compress 5 : LZW compression
-compress 6 : OJPEG compression
-compress 7 : JPEG DCT compression
-compress 32773 : PACKBITS compression
-compress 32809 : THUNDERSCAN compression
-compress 88880 : 204x98 G4 ClassF TIFF
-compress 88881 : 204x196 G4 ClassF TIFF
-compress 88882 : 204x98 G3 ClassF TIFF
-compress 88883 : 204x196 G3 ClassF TIFF
-compress 88884 : CCITT Group 3 fax encoding (2d)
You can use "-compress 88882" to convert PDF file to CCITT G3 format,
pdf2img.exe -compress 88882 -mono C:\in.pdf C:\out.tif
pdf2img.exe -compress 88882 -mono -multipage C:\in.pdf C:\out.tif
VeryDOC
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No, you are not understanding. I want to use grayscale and NOT mono since the fax files are too large and take a long time to go through. When we use grayscale the file produced is much smaller but since the tiff settings are wrong, the fax does not go through -
My syntax is-
pdf2img.exe -multipage -gray -compress 3 -xres 204 -yres 196 -w 1728 -h 2156 c:\temp\img-X24120122-0001.pdf c:\temp\graytest.tif
The tiff settings that are wrong are:
Resolution: 96, 96 pixels/inch THIS SHOULD BE- 204, 196
Compression Scheme: CCITT Group 4 THIS SHOULD BE- CCITT Group 3
Please fix this.
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Sorry, the ClassF TIFF file MUST be in black and white mode, grayscale TIFF file is not comply with the faxable TIFF spec, please understand this matter.
Please look at TIFF-F Revised Specification from following web page,
http://cool.conservation-us.org/bytopic/imaging/std/tiff-f.html
VeryDOC