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 7 2011, 10:27 AM
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#2
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
some of it still works
http://www.mapaplanet.org/explorer/venus.html leftlook http://www.mapaplanet.org/explorer-bin/exp...mp;resolution=2 you need to use the advanced option on the left 10 deg bonding box http://www.mapaplanet.org/explorer-bin/exp...mp;center_lat=0 and a bigger http://www.mapaplanet.org/explorer-bin/exp...mp;center_lat=0 there is a windows build of a program i use " FWTools " http://fwtools.maptools.org/ http://fwtools.maptools.org/windows-main.html it DOSE run on XP might but on Windows 7 ? i do not know now it will NOT open IMG files it DOSE open them as raw and that is nice BECAUSE it not onlt will work with 8 bit ( 256 tone) but also 16 bit Unsinged AND singed AND in LSB AND msb -- that is VERY VERY VERY important on windows some 16 bit gray images ( 65536 tones of gray ) are in LSB and some are in MSB - this IS A VERY big pain in the butt using MS Windows then add in singed and unsinged and it is a BIGGER mess it also opens up 32 bit floating point images now above you posted the dimensions "8466 wide by 2830" BUT the header states there are 2833 lines in the file ( this includes the text header ) . So they need to be "skipped" in the raw import this one is 3 full lines so it can just be cropped after , at some latter time .But not always , it "could be 1/3 of 1 row -- then the image will look very odd. i use Ghex ( linux) http://live.gnome.org/Ghex hexedit might do for windows http://www.hexedit.com/download.htm or http://mh-nexus.de/en/hxd/ and read the text part of the file now OpenEV ( one the main tools in fwtools) using "Proj4" can remap them to simple cyc and do that in the GUI |
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