[X] My Assistant

[Nix]

I have recently updated the site with some new mosaics and others to be followed but meanwhile I'm starting to get optimistic about the Everest Panorama. For now I'd like to share the fullres uncorrected panorama as I feel it's interesting in a way, though composed of raw images.


see AwalkonMars home_go 'progress on 360 panoramas'

or directly;

L256 false-color 100%

L2 red channel 50%
L5 green channel 50%
L6 blue channel 50%

Nico

[ugordan]

Actually - it IS what it would look like with human eyes - to the best of the scientists knowledge.

They HAVE done the calculation using L2 + L5 to get L4 - believe me a panorama done with straight L256 looks utterly utterly horrible and nothing like the Athena release at all

I stand corrected then. I was under the impression the scene looks way too red compared to some of the earlier panoramas. The shots of Bonneville crater, for example, with the heat shield had 2 different image releases, one was similarly red and another one was more akin to Earthly deserts and that one was supposedly the true color one (the other one being infrared).

[maycm]

Being a bit of a technical ignoramus when it comes to understanding all this wavelength malarky, I have a question.

Are the 'approximate true colour' images based on what a person might see illuminated by Earth type ("white") lighting conditions or Mars ("pink"???) lighting.

I guess my question is whether the images are adjusted to make the blue markers look blue as the would on earth, or some other colour based on Mars lighting. I would hope the latter, but each poster may have adjusted in a differing way of course.

[Nix]

there. Is it true color? Nope. Is the picture you took yesterday with your digital camera true color? Nope. L256 is 3 filters, just like your ccd- or cmos sensor is filtered by red, green, blue. An inboard algorithm makes color of that information. Different brands produce different hues, even through identical lenses and settings. I'm tempted to state that the 3-filter and surely L234567 color, when calibrated properly produces better true-color than any prosumer camera you're going to buy.

Take a look at an 'informative' sol318-325 pan I did;
Latest 360°
Notice the differences only a few hours of difference make. All right, saturation could be too high, as well as contrast. But still.

Now I started 'correcting' this Everest pan with quite some optimism but gave up. The Nasa/JPL version is a better approximation than my messy raw-pan( ) but we'll be glad when we get the calibrated data for this..

Mars' surface changes in brightness, color just like any other planet with something of an atmosphere.
When you have perfectly calibrated color-you want to make the entire pan look that way, ..you go changing brightness, in the separate channels. There's no perfect pan anyway - you have differing directions and darkness of shadows.

Nico

[GregM]

.

[tedstryk]

I think true-color may be even more relative than that. I know that during this autumn, which was a pretty good one in terms of color hear in East Tennessee, I got into debates with several friends about the specific colors of certain leaves. It led me to wonder whether there are differences in the calibration of individuals eyes. Of course, this is problematized by the fact that you can only see through your own eyes.

[Nix]

You're right tedstryk, ad the possiblity that our interpretation of color differs and our eyes themselves differ slightly and it becomes -very relative.

Oh GregM, hey, I haven't said I give up for good! I just stopped at the point the histogram of some frames got clipped real bad in order to match neighboring brightness/color.

I could be at it again next week or next month, but I'm working on others (which are calibrated...) now - Larry's Lookout & Endurance South.

I rather think I'm going to redo the entire pan but using Michael's AV-tool this time OR wait for the calibrated release.

Nico

[Bill Harris]

I think true-color may be even more relative than that. I know that during this autumn...

The mysteries of color perception are a science all to themselves. Back in the pre-digital days, you could photograph the same scene using Velvia, Provia, Ektachrome or Kodachrome and each film would have it's own look and feel. And going from slide to print would add another subset of differences.

Color is color but it ain't necessarily true...

--Bill