Re: [Gimp-user] Opening raw images in GIMP

Thanks, Guy. 

Ha ha. No big deal re: the job. I only did it for 30 years.

I’m capable of doing command line stuff, but not a huge fan. Ran into an error trying to install UFRaw and 
ground pretty quickly to a halt.

I did send Emily an email telling her that I was able to open the Phoenix .img image with NASAview 3.18.0 and 
save as a GIF. JPEG is another NASAview save option, but I figure she’d want to go with the least lossy 
format available. 

I’ll pass the info along to her.


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It’s better to wave at a stranger than to ignore a friend
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On Jan 30, 2019, at 1:44 PM, Guy Stalnaker <jimmyg521 gmail com> wrote:


It pays to make no assumptions about folks one meets online (in forums, Twitter, etc.)

Rick Kline
Data Manager (ret.) <-- !
Spacecraft Planetary Imaging Facility, Cornell University <-- !!!!

Indeed :-)

I followed Stave Liam's method and it does mostly work (using Emily Lakdawalla's test image I saw mostly 
what she sees in her Photoshop process though there is "missing" data--you'll see what I mean if you do 
this). Biggest issue is that GIMP, as she says, makes assumptions about data encoding and the only options 
in the GIMP open dialog where you specify information about the image provides no options that seem 
relevant to the way the data is encoded in the .img file.

Liam mentions G'MIC and you may have more success there. It, like GIMP, is free and, more importantly, it 
has far more options related to image data content (it's written by imaging data scientists for use in 
manipulating scientific image data). And it's scriptable already! A steep learning curve for someone like 
me with no background in such things, but for you and your background it may be just what you're looking 
for (and I can attest that G'MIC developers are veyr nice people who are approachable if you have 
questions). If you're comfortable with a command line (and I can't imagine you are not given your 
background) G'MIC may save you a fair bit of time.



Guy Stalnaker
jimmyg521 gmail com <mailto:jimmyg521 gmail com>

On Wed, Jan 30, 2019 at 12:18 PM Rick Kline <rick kline ms <mailto:rick kline ms>> wrote:
Thanks, Liam,

I like the “change the file type” method best, because there’s no messing with the contents. Easy enough to 
find header size (offset) - look at the file info, Lines x Samples x bytes (16 bit image = 2 bytes). 
Subtract result from actual file size and you have the header size.

In PDS images, the ^image (“hat image”) parameter tells what byte the image starts on. I used to use that 
in P’shop when importing uncompressed (.img) PDS images. Even wrote some scripts for P’shop and NIH Image 
(now Image J) to import Viking Orbiter, Viking Lander, and Magellan images that used ^image. Those scripts 
are probably long gone, and I’m retired from the Astro job. May have to contact my also retired work friend 
known as Dr. Bithead to get some help with script writing for GIMP.

I’ll give the .data trick a try.


Rick Kline
Data Manager (ret.)
Spacecraft Planetary Imaging Facility, Cornell University

 * * ** *** ***** ******** ************* ********************* 
It’s better to wave at a stranger than to ignore a friend
 * * ** *** ***** ******** ************* ********************* 

On Jan 29, 2019, at 9:42 PM, Liam R E Quin <liam holoweb net <mailto:liam holoweb net>> wrote:

On Tue, 2019-01-29 at 11:43 -0500, Rick Kline wrote:

Some folks working with planetary data would like to use raw PDS <> may help. It needs to be updated to handle 16-
bit images now that GIMP can open them.

it’s also possible to use ImageMagick or g'mic to conver the VICAR/PDS
raw images to PNG, although you may need to use a hex (or octal) editor
to work out where the image starts exactly. You can also name the image and open it in GIMP, and the pop-up window will ask you
for an offest and the format.

Hope this helps,

slave liam

Liam Quin - web slave for <>
with fabulous vintage art and fascinating texts to read.
Click here to have the slave beaten.

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