Having trouble opening Europa map, Unable to open 24K Europa map I found |
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Having trouble opening Europa map, Unable to open 24K Europa map I found |
 Nov 3 2021, 01:42 PM
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#1
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 Member  Group: Members Posts: 246 Joined: 13-October 09 From: Olympus Mons Member No.: 4972  |
I recently found this map of Europa and GIMP is unable to open it despite my computer being able to open maps up to 64K in size and GIMP supporting JPEG2 files.
https://repository.hou.usra.edu/handle/20.500.11753/1412 Does anyone know how I can open this file? -------------------- "Thats no moon... IT'S A TRAP!"
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Nov 3 2021, 05:45 PM
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#2
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 Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
that file is 612-MB -- It is a JPEG 2000
you may just simply need to update your tools (photoshop. irfanview, -etc) Ita also // 25K pixels tall // 49K pixels wide // pretty! -------------------- CLA CLL
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Nov 3 2021, 07:43 PM
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#3
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 Member Group: Members Posts: 127 Joined: 15-April 21 Member No.: 9009 |
QUOTE (PDP8E @ Nov 3 2021, 06:45 PM)  that file is 612-MB -- It is a JPEG 2000 you may just simply need to update your tools (photoshop. irfanview, -etc) Ita also // 25K pixels tall // 49K pixels wide // pretty! what does the map look like (my pc won't be able to handle it, it too bulky for my pc)? |
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Nov 3 2021, 08:17 PM
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#4
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Member Group: Members Posts: 246 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
Irfanview is unable to open this, GIMP just closes, and I cannot afford Photoshop.
-------------------- "Thats no moon... IT'S A TRAP!"
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Nov 4 2021, 12:00 AM
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#5
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 Merciless Robot Group: Admin Posts: 8790 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Topic moved to Image Processing Techniques.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Nov 4 2021, 01:38 AM
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#6
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 IMG to PNG GOD Group: Moderator Posts: 2257 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I was able to open it in Affinity Photo.
An awesome map BTW that I hadn't seen before. |
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Nov 4 2021, 08:42 PM
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#7
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Solar System Cartographer Group: Members Posts: 10258 Joined: 5-April 05 From: Canada Member No.: 227 |
This does point to the value of releasing images like this in different scales and formats. A version released as a PNG or JPG at 25% or 50% of the size would be all that most users would need. JP2 is not the most accessible format for the average user.
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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Nov 5 2021, 12:37 AM
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#8
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 Senior Member Group: Members Posts: 1454 Joined: 26-July 08 Member No.: 4270 |
For the curious who want to see the image without dedicating 30 minutes to downloading and opening the file, here's a small preview of it.
Attached thumbnail(s)
-------------------- -- Hungry4info (Sirius_Alpha)
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Nov 5 2021, 04:10 PM
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#9
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 Member Group: Members Posts: 447 Joined: 1-July 05 From: New York City Member No.: 424 |
Thanks, very thoughtful of you.
That's a remarkable image of Europa, and quite unlike any that I can recall. |
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Nov 9 2021, 11:58 AM
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#10
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Member Group: Members Posts: 127 Joined: 15-April 21 Member No.: 9009 |
QUOTE (Hungry4info @ Nov 5 2021, 01:37 AM) For the curious who want to see the image without dedicating 30 minutes to downloading and opening the file, here's a small preview of it. wow that is gorgeous, also shadows in some areas are very prominent, so we could do some SFS dems (once we kill the albedo variation)? |
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Nov 9 2021, 10:42 PM
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#11
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Founder Group: Chairman Posts: 14449 Joined: 8-February 04 Member No.: 1 |
QUOTE (TrappistPlanets @ Nov 9 2021, 03:58 AM) so we could do some SFS dems (once we kill the albedo variation)? You can't do SFS on a mosaic like that. The lighting is different based on which bits of the mosaics are made from which source images and the lighting for those source images. You must do SFS on the source images and then mosaic those outputs. |
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Nov 10 2021, 03:26 PM
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#12
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Senior Member Group: Members Posts: 1598 Joined: 14-October 05 From: Vermont Member No.: 530 |
Right, and as much as the shadows in the polar regions are large, maps tend to be made from images with a phase angle near zero for as much of the surface as possible, so that you see only albedo, not shadow. They'd excise the shadows at the poles if they could.
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