need help. how to uncompress .img files from magellan |
need help. how to uncompress .img files from magellan |
Jan 6 2011, 11:33 PM
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#1
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Junior Member Group: Members Posts: 91 Joined: 21-August 06 Member No.: 1063 |
Hoping someone can help.
I am trying to uncompress the FMAP .img files which are part of magellans images of venus so I can use a converter program to convert them from sinusodal to cylindrical mapping. Things I do know is that I can just rename .img to .raw and open in photosho however the converter program newmap.exe which is an old dos program that is provided with the FMAP images requires I think the uncompressed .img files in order to convert sinusodal to cylindrical. I know the .raw didnt work. And I get error saying my .img files are compressed so it wont work. I know .img files are not cd or dvd image file or so I think becuase I could not open them in MagicISO If they were CD images I would think MagicISO would work but I may be wrong though. Anyone familiar with what I am trying to do. Any image processing guys out their do this with the magellan FMAPS? I figure the experts would be here. thanks |
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Jan 6 2011, 11:44 PM
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#2
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
.img files are not compressed, they are basically tiff-like files with a different header which can be opened in Photoshop as raw images if you know the pixel dimensions (which are given in the label). You probably knew that anyway.
But there are also .imq files which are compressed versions of the .img images. Those have to be treated differently - if you are getting the .img files from the old PDS cd-roms there might be a utility on the disk. I used to deal with those files all the time (and still have probably well over a hundred of the cd-roms collecting dust), but it's been so long I can't remember the details of it now. It's possible your software just doesn't recognize the PDS .img format and simply thinks it is compressed when it isn't. If the software needs tiffs, for instance, you might have to open in Photoshop and save as a tiff. We could really use a good clickable map interface to the various levels of Magellan products, too! Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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