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Voyager 2 imaging of Triton
TrappistPlanets
post Nov 7 2021, 07:30 PM
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QUOTE (JRehling @ Nov 7 2021, 04:46 PM) *
By no means is doing this with images that someone has already processed for another purpose the best way to proceed. Whatever artifacts they may have introduced at very low values (0, 1, 2) is part of what you're trying to make something of now. There are multiple obvious artifacts and there's no accounting therefore for what is artifact and what isn't.

Never with work like this should you begin with an image that someone posted after performing undocumented processing to the original.


all the images on USGS PILOT are low resolution, and are full of jpeg artifacts, witch destroys any detail from potential neptuneshine or atmospheric haze lit terrain (same goes for PDS Image Atlas)

so where can i go to get original unprocessed images that doesn't have jpeg artifacts and is a good resolution
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mcaplinger
post Nov 7 2021, 07:38 PM
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QUOTE (TrappistPlanets @ Nov 7 2021, 11:30 AM) *
so where can i go to get original unprocessed images that doesn't have jpeg artifacts and is a good resolution

https://pds-imaging.jpl.nasa.gov/volumes/voyager.html has the raw images in PDS format.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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JRehling
post Nov 7 2021, 07:48 PM
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QUOTE (TrappistPlanets @ Nov 7 2021, 12:30 PM) *
so where can i go to get original unprocessed images that doesn't have jpeg artifacts and is a good resolution


This thread itself, if you go back to the beginning, is full of information useful to the topic at hand, including a link to:

http://www.unmannedspaceflight.com/index.p...mp;#entry138447

which has more links to more information.

In general, this board is incredibly informative if you focus on the text as well as the images. Photoshopping the images you find is never going to be as informative as reading and following up on all of the discussion, which has already spoken to some of your questions. If you find something interesting in the nth post of a thread, consider reading posts #1- (n-1) in that thread.
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TrappistPlanets
post Nov 7 2021, 10:51 PM
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QUOTE (mcaplinger @ Nov 7 2021, 07:38 PM) *


where do i find the triton images though, and can gimp open that format, i use GIMP not PS
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djellison
post Nov 7 2021, 11:12 PM
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QUOTE (TrappistPlanets @ Nov 7 2021, 03:51 PM) *
where do i find the triton images though, and can gimp open that format, i use GIMP not PS


You are going to have to do some of this work yourself. Google is your friend. The PDS is thoroughly documented. There are many tools available to process the products it has. The PDS has search tools.

http://bjj.mmedia.is/utils/img2png/ is what you will probably want to turn PDS published data into something GIMP can open.
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mcaplinger
post Nov 8 2021, 01:39 AM
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QUOTE (TrappistPlanets @ Nov 7 2021, 02:51 PM) *
where do i find the triton images though...

Maybe in the triton subdirectories? The image names that when into the mosaics are shown at the bottom of the mosaics.

Honestly you have this a lot easier than I did in 1981 when I saw my first Voyager data on 6250 bpi magnetic tapes. smile.gif


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JohnVV
post Nov 8 2021, 02:24 AM
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use PILOT
it is a search tool

Attached Image


you will need to open the *.imq files ( voyager are NOT the default img files )
then remove the reasue dots
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TrappistPlanets
post Nov 9 2021, 11:55 AM
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QUOTE (JohnVV @ Nov 8 2021, 02:24 AM) *
use PILOT
it is a search tool

Attached Image


you will need to open the *.imq files ( voyager are NOT the default img files )
then remove the reasue dots


how do i open the imq files in gimp?
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JohnVV
post Nov 9 2021, 02:40 PM
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i think that " img2png" can open Voyager pds images

however i use ISIS4 on them
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TrappistPlanets
post Nov 9 2021, 09:51 PM
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QUOTE (JohnVV @ Nov 9 2021, 03:40 PM) *
i think that " img2png" can open Voyager pds images

however i use ISIS4 on them


i am trying to find a 32 bit program of img2png, but i can't seem to find one, although google said "IMG2PNG is now a 64 bit program (earlier versions were 32 bit). This was a necessary change to make it possible to convert extremely large images, in particular 46080x23040 pixel LRO DEMs"

where can i find the previous versions that are 32 bit so i can try the program on triton
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Brian Swift
post Nov 10 2021, 12:34 AM
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QUOTE (TrappistPlanets @ Nov 9 2021, 01:51 PM) *
...
where can i find the previous versions that are 32 bit so i can try the program on triton

You could take a look at the old version from the Internet Archive
http://web.archive.org/web/20190430175504/.../utils/img2png/
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kymani76
post Jun 20 2022, 01:20 PM
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Recently data from the article by Schenk et al. 2021 became available here.
I played around with stereo DEM data to create this maps, one showing the whole extent, the other close up of Kibu Patera area with contours. There are a lot of (sublimation?) holes visible in the terrain, that were not so obvious in photo only renderings.
I guess this elevation dataset is all that will be available for a very long time...

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kymani76
post Jun 20 2022, 01:22 PM
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Attached Image

Kibu Patera close-up map.
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