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I've been working on a "small" side project for the past year or so on and off where it requires me to extract data from a old piece of software.

It has been really fun the highs are high and the lows are so frustrating but I'm finally near the end of the puzzle I believe, but little did I know this was going to be my gray hair moment in life.

The software has diagrams stored inside 1 huge file which from my research seem to be group 4 compressed TIFF image data surrounded by some other software specific image markers.

I've been experimenting with the hex code in order to get a image output with no luck and was wondering if anyone had some insight into this sort of thing, long shot I know...

https://pastebin.com/j06PUeMV

This is the header seperated from what I believe is the image data:

4D 4D 00 2A 00 00 00 08 00 09 01 00 00 30 00 00 01 02 F8 00 00 01 01 00 03 00 00 00 01 04 58 00 00 01 03 00 03 00 00 00 01 00 04 00 00 10 60 00 30 00 00 01 00 00 00 00 01 11 00 04 00 00 00 01 00 00 00 82 01 16 00 03 00 00 00 01 04 58 00 00 01 17 00 04 00 00 00 01 00 00 20 B2 01 1A 00 05 00 00 00 01 00 00 00 7A 01 1B 00 05 00 00 00 01 00 00 00 7A 00 00 00 00 00 00 00 48 00 00 00 01

The link above is what I have gotten to so far which is a 130 byte TIFF header prepended to the image data that I've extracted from the bigger 1GB data file.

Can anyone see why this would not render a image as it is or guide me in the direction of useful resources?

I've extracted what I believe to be the image data from the original 1GB file and prepended a valid TIFF header expecting a image to be rendered but with no luck, I'm not sure if I'm missing other data or not.

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  • I am not sure to understand your question. Is the file a complete TIFF, or are you prepending a TIFF header yourself? In the first case, did you try a TIFF dump utility? Commented Aug 20, 2024 at 12:01
  • It is a incomplete TIFF, it seems the software had a large IMAGEF.DAT file which has many TIFF files without the headers included. I found a resource which explained the format of the file which seems to match here: priuschat.com/threads/… Using this I extracted the image data and neccesary height, width and byte size parameters for the headers and then preappended them but with no avail. Commented Aug 20, 2024 at 12:11
  • The header you've shown (and have in the pastbin) doesn't match the description you linked to in the priuschat. Specifically, there is some sort of offset; note the byte that is 0x30 -- this is where a valid tiff datatype should be, and should probably be 0x03. Then there appears to be a dropped byte, at which point I'm guess the image width is 0x2f8 = 760; the next couple of tags then read correctly with a height of 0x458 = 1112 and a compression of T6, then we've dropped another nibble so the 0x106 tag is misaligned, and another nibble after that. Commented Sep 16, 2024 at 13:32
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