[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

[GregM]

.

[ugordan]

I was pretty underwhelmed with the "official" version released recently.

Did I understand that they used the L2 instead of L4 filter for the red channel yet again? Why do they insist on using the infrared channel and labeling the final product as true color? I find the official Everest panorama way too red, and that sundial pink chip definitely doesn't add credibility to their "true color" statements.

[djellison]

Why do they insist on using the infrared channel

Because it give a lot more spectral variation to the scene - you get SO much more information from an L2 image than an L4 image. L4 images look very flat, with little of high contrast.

and labeling the final product as true color? I find the official Everest panorama way too red, and that sundial pink chip definitely doesn't add credibility to their "true color" statements. 

They've not said true colour. They've said APPROXIMATELY true colour. You can 'emulate' an L4-like filter using L2 and L5. Infact Bjorn has done the maths to do just that, and the two are very very very similar indeed. The end resulting mosaic is very little different - if at all - than if it had been taken with L456 instead of L256 - but in taking the L2 channel, they get a lot more information, and a better 3D terrain mesh as there are more feature to co-register between frames.

This panorama spans 360 degrees and consists of images obtained during 81 individual pointings of the panoramic camera. Four filters were used at each pointing. Images through three of the filters, for wavelengths of 750 nanometers, 530 nanometers and 430 nanometers, were combined for this approximately true-color rendering.

The panorama spans 360 degrees and consists of images obtained in 81 individual pointings and 4 Pancam filters at each pointing. This mosaic is an approximate true color rendering generated using the images acquired through Pancam's 750, 530, and 430 nm filters.

The pink chip is a well documented, well explained result of the near IR response of that colour pigment - it's a specific feature of that chip - http://www.atsnn.com/story/30048.html explains it very well indeed.

Doug