need help. how to uncompress .img files from magellan Options

[ncc1701d]

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

[siravan]

Here is the first image (reduced to 25% of its original size) in the folder:



The header is included below. I used ImageJ to import the raw with parameters: height =2830 (LINES), width=3184 (LINE_SAMPLES), offset to the file=12736 (i.e. ^IMAGE*RECORD_BYTES), pixel type is byte (SAMPLE_BITS=8). Also note there is a histogram contained in the third record.


PDS_VERSION_ID = PDS3

/* FILE FORMAT AND LENGTH */

RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 3184
FILE_RECORDS = 2833
LABEL_RECORDS = 2

/* POINTERS TO START RECORDS OF OBJECTS IN FILE */

^IMAGE_HISTOGRAM = 3
^IMAGE = 4

/* POINTER TO THE TABLE CONTAINING ORBIT LOCATIONS */

^TABLE = "73N003OR.TAB"

/* IMAGE DESCRIPTION */

DATA_SET_ID = "MGN-V-RDRS-5-DIM-V1.0"
PRODUCT_ID = "78N018"
SPACECRAFT_NAME = MAGELLAN
SPACECRAFT_ID = MGN
INSTRUMENT_NAME = "RADAR SYSTEM"
INSTRUMENT_ID = RDRS
TARGET_NAME = VENUS
START_TIME = "N/A"
STOP_TIME = "N/A"
SPACECRAFT_CLOCK_START_COUNT = "N/A"
SPACECRAFT_CLOCK_STOP_COUNT = "N/A"
PRODUCT_CREATION_TIME = 1993-09-28T15:55:50
IMAGE_ID = FL73N003
MISSION_PHASE_NAME = {"MAPPING CYCLE 1",
"MAPPING CYCLE 2",
"MAPPING CYCLE 3"}

/* DESCRIPTION OF OBJECTS CONTAINED IN FILE */

OBJECT = IMAGE_HISTOGRAM
ITEMS = 256
DATA_TYPE = LSB_UNSIGNED_INTEGER
ITEM_BYTES = 4
END_OBJECT = IMAGE_HISTOGRAM

OBJECT = IMAGE
LINES = 2830
LINE_SAMPLES = 3184
SAMPLE_TYPE = LSB_UNSIGNED_INTEGER
SAMPLE_BITS = 8
SAMPLE_BIT_MASK = 2#11111111#
CHECKSUM = 938107697