January 3, 2007, HiRISE release |
January 3, 2007, HiRISE release |
Jan 9 2007, 03:53 PM
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#16
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Member Group: Members Posts: 428 Joined: 21-August 06 From: Northern Virginia Member No.: 1062 |
But what's with the graininess in this image? It doesn't look like binning, it looks like ...well, grains? It looks like the effect of a very low S/N ratio. Now that I see the higher resolution I understand a bit more. Keep in mind that the area is dark, and well, while the normal SNR of HiRISE is very good, it doesn't work as well when there isn't as much signal, AKA dark areas. That and we are still working on perfecting the calibration, which will help with that level of noise to a level. Hope this helps! EDIT: I've been thinking a bit more about this, and have a few more things to say. It's a not-so-well known problem, but still public, that IR10_1 has some issues. It's a very noisy channel. In the early days of PSP, we were able to take pictures of it by warming up the whole camera to a certain point. This allowed for some readable images from IR10. However, we've since decided that it isn't really worth it, and this is because it makes the rest of the images appear very noisy. The images that are being released now generally fall under the time that we were testing IR10_1, to see if we could get anything out of it. However, it has the tendency to make the image appear much noisier, was the case with the image shown here. Hope this helps! |
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Jan 9 2007, 06:47 PM
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#17
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
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Jan 9 2007, 09:54 PM
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#18
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
The latest version of OpenEV works for JP2 files on my computer. It's slow, but it works. Finally, I can view the larger files!
This closer look gives me a slightly different impression of the flow in Kasei Vallis. Some of the craters look different close up. Many are flattened with relatively level floors. The younger one shown by CosmicRocker is one of the exceptions; but even it is weird in it's own ways. I also found a deep crack or crevasse across part of the flow structure. I'll post a crop of it once I figure out how to capture images from the new close ups using this program. |
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Jan 10 2007, 06:59 AM
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#19
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
I have only experimented with the export function in OpenEV_FW a bit, but under File/Export you'll find many options, but it seems to save the entire image. To simply save a jpeg of a particular view, I have found it easier to grab a screenshot of the view, and then edit it in Photoshop or whatever you use. I think ExpressView saves only your current view. Although it seems to crash if I use it too much, it is a useful program. I like it's ability to measure, but you need to use that cautiously, as it only measures pixels for these files, even though it allows you to select various units of length. Apparently the information needed for scaling in different units is not being passed to the program in these JP2s.
I noticed that the HiRise team has been linking each image to a HiRise and JPEG-2000 FAQ that mentions other software I haven't tried and haven't heard mentioned around here. I'd sure like to hear if any of these other programs are working well for others. -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Jan 10 2007, 09:04 AM
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#20
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
I have only experimented with the export function in OpenEV_FW a bit, but under File/Export you'll find many options, but it seems to save the entire image. To save a crop of the whole image you must enable "Advanced Options" and "Window Input File" toggle buttons and then input the x,y coordinates and dx,dy size of the area you want to export in the "Start Line", "Start Pixel", "Num. of Lines", and "Num. of Pixels" fields. |
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Jan 10 2007, 05:03 PM
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#21
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Actually, once you've selected the "Advanced Options" and "Window Input File" toggle buttons, you can use your mouse to draw a marquee on the image, and OpenEV plugs the appropriate numbers into the coordinates fields.
Note you can also ask it to downsample when you export. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jan 12 2007, 05:14 AM
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#22
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
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Jan 12 2007, 05:23 AM
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#23
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
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Jan 12 2007, 05:28 AM
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#24
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
Thank you all for the help. You know, posting .bmp files isn't all that sensible, they take up lots of space, don't show up as thumbnails and a lot of browsers won't show them, forcing you to view them with an external program. Any chance you could use jpegs or pngs instead? -------------------- |
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Jan 12 2007, 05:33 AM
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#25
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
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Jan 12 2007, 05:36 AM
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#26
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Member Group: Members Posts: 258 Joined: 22-December 06 Member No.: 1503 |
You know, posting .bmp files isn't all that sensible, they take up lots of space, don't show up as thumbnails and a lot of browsers won't show them, forcing you to view them with an external program. Any chance you could use jpegs or pngs instead? Sorry about that. The program is new for me. Yes, I can. But I'll have to reconvert the files. Can I edit the posts to reflect the new files or just repost them? |
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Jan 12 2007, 05:45 AM
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#27
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
No problem, just a helpful hint. A lot more people are likely to look at it if it's a jpeg rather than a bmp.
You should be able to remove the old versions and reattach new ones in of the existing posts using the Edit button (then 'Full Edit' from the list) James -------------------- |
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Jan 12 2007, 07:18 AM
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#28
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
Thanks, Tesheiner. So, that's what the input window is...duhh!
Emily, thanks also...clicking and dragging is so much easier. Who would have guessed that the mouse worked? -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Jan 12 2007, 08:51 AM
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#29
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
You know, posting .bmp files isn't all that sensible, they take up lots of space, don't show up as thumbnails and a lot of browsers won't show them, forcing you to view them with an external program. Infact, I'm going to pull them off the approved attachments list ( which for some reason, they are on by default) Doug |
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