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C
civilare
Participant
May 9, 2023
Question

Which software can convert PDF(or some other format) to CCITT Group 4?

  • May 9, 2023
  • 2 replies
  • 2740 views

Hi, I badly need to be able to convert dxf or pdf or dwg to CCITT T.6 (group 4) to have on drawings, is there a software for this? 

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2 replies

T
Test Screen Name
Legend
May 9, 2023

CCITT T.6 isn't a file format by itself. It's a way of compressing 1-colour images used in several file formats. 
Do you mean 

- images in the PDF are to be in CCITT T.6 (though they will look just the same)?

- you want a TIFF file, made using CCITT T.6 compression?

- some kind of fax related file format?

- something else?

C
civilareAuthor
Participant
May 9, 2023

Thanks for answering. 
It's our PLM-system for CAD drawings that can't handle anything but images with CCITT T.6 compression and it could so bad that its only TIFF with CCITT T.6 compression.  So I believe its the "- you want a TIFF file, made using CCITT T.6 compression?" alternative I'm looking for.

So, is there a software that can make TIFF with CCITT T.6 compression from pdf? we can recive also dxf or dwg, some autocad format. 

C
civilareAuthor
Participant
May 9, 2023

Group 4 compression - Wikipedia

CCITT Group 4 compression, also referred to as G4 or Modified Modified READ (MMR), is a lossless method of image compression used in Group 4 fax machines defined in the ITU-T T.6 fax standard. It is only used for bitonal (black-and-white) images. Group 4 compression is based on the Group 3 two-dimensional compression scheme (G3-2D), also known as Modified READ, which is in turn based on the Group 3 one-dimensional compression scheme (G3), also known as Modified Huffman coding. Group 4 compression is available in many proprietary image file formats as well as standardized formats such as TIFF, CALS, CIT (Intergraph Raster Type 24) and the PDF document format.

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