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Having trouble opening Europa map, Unable to open 24K Europa map I found
Antdoghalo
post Nov 3 2021, 01:42 PM
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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?


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PDP8E
post Nov 3 2021, 05:45 PM
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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!


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TrappistPlanets
post Nov 3 2021, 07:43 PM
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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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Antdoghalo
post Nov 3 2021, 08:17 PM
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Irfanview is unable to open this, GIMP just closes, and I cannot afford Photoshop.


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nprev
post Nov 4 2021, 12:00 AM
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Topic moved to Image Processing Techniques.


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Bjorn Jonsson
post Nov 4 2021, 01:38 AM
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I was able to open it in Affinity Photo.

An awesome map BTW that I hadn't seen before.
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Phil Stooke
post Nov 4 2021, 08:42 PM
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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


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Hungry4info
post Nov 5 2021, 12:37 AM
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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)
Attached Image
 


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Tom Tamlyn
post Nov 5 2021, 04:10 PM
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Thanks, very thoughtful of you.

That's a remarkable image of Europa, and quite unlike any that I can recall.
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TrappistPlanets
post Nov 9 2021, 11:58 AM
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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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djellison
post Nov 9 2021, 10:42 PM
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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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stevesliva
post Nov 10 2021, 03:26 PM
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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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