Manipulating Phoenix RDR images, They're 32 bit -- how do I deal with that? |
Manipulating Phoenix RDR images, They're 32 bit -- how do I deal with that? |
Mar 24 2009, 01:03 AM
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#1
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
In anticipation of writing about the "droplets on the legs" story I wanted to go play with the calibrated RAC images of Holy Cow. But the RDRs are 32-bit images, and I'm not sure how to open them. NASAView can at least open and display them, but it applies an automatic contrast stretch (I think) and only permits output as 8-bit GIFs or JPEGs. In an ideal world I'd like to be able to convert them all to 16-bit images in any format that Photoshop can read, using a common conversion from 32 to 16 bits -- does anybody have any advice?
Here is a sample image (the first, from sol 5). Text header is at the beginning of the file. I would be quite happy to track down and provide all the .IMG files for the Holy Cow images that have been released to date to anyone who wants to play with them. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Mar 24 2009, 05:20 PM
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#2
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
How many images do you need converted? If it's not too many I could do it manually, rather than releasing this 15-minute hack job of QUB2PNG I just did. Here's the sample 16 bit PNG:
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Mar 24 2009, 05:35 PM
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#3
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I found 19 images of spotty struts in the PDS, but the money shots seem to be these three:
rs008rad896930338_11856mdr1 rs031rad898970546_13820mdr1 rs044rad900125912_14de0mdr1 Thanks for your help. I think I could probably use GIMP to do this but I really need to learn how to use GIMP to manipulate 8- and 16-bit images (which I haven't done yet) before I start mucking about with 32-bit ones. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Mar 24 2009, 05:41 PM
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#4
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Here they are. Note the calibrated output uses physical units (I *think*) so it's impossible for me to find a scaling factor that stretches saturated pixels to white. These are scaled the same amount as the one above.
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Mar 24 2009, 05:48 PM
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#5
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Lovely, thank you, I feel much better about staring at these pixels than I do with the NASAView -> GIF versions.
In the end though I just don't know what to make of the images. The Renno abstract uses the phrase "smoking gun" three times. I don't see anything wrong with his arguments but I just don't feel comfortable agreeing with the statement "we see liquids on Mars right now!" based upon images of "drops" that are only a few pixels across. Guess they're the experts though. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Mar 25 2009, 02:27 AM
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#6
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Member Group: Members Posts: 128 Joined: 10-December 06 From: Atlanta Member No.: 1472 |
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