Rosetta Mars Options

[tedstryk]

It appears Rosetta stuff, including the Mars flyby Osiris data, has hit the PDS. I don't have time to look at it now, but I'm downloading it. http://pdssbn.astro.umd.edu/holdings/

[Bjorn Jonsson]

I haven't modified IMG2PNG for Rosetta yet - actually I was waiting for the Mars flyby data to appear. The problem is probably that when converting the floating point (level 3) images, IMG2PNG 'knows' nothing about the data so it uses the actual data range to map the floating point values to 0-65535 (the mininum floating point value is usually set to ~0 though). This is bad if there are bright specks in the images and makes them dark. Another problem is that different filters (or more accurate - images) get stretched differently. I need to upgrade IMG2PNG to 'know' the Osiris data. I may do it this weekend or possibly earlier.

Interestingly, the Messenger data is somewhat comparable to the Osiris level 3 data since it contains floating point data. The important difference is that IMG2PNG should know how to handle the Messenger stuff.

And by the way this is clearly a beautiful dataset - I get the impression that these are the best global views ever of Mars, at least if you only count framing cameras.

[elakdawalla]

I need to upgrade IMG2PNG to 'know' the Osiris data. I may do it this weekend or possibly earlier.

Now you tell me I noticed the varying color values when attempting to assemble the 4-frame mosaic. I was hoping to make one with Phobos appearing four times across the disk, but had to give up partway through; it just wasn't working.

In the meantime, here's one with Mars limb and Phobos. Pseudocolor, made of Red and UV frames only (the reason for the bizarre violet color at the limb). I had to brighten Phobos a lot to make it visible at lower resolution -- it's a very dark moon!

For those of you attempting color processing, please note that the "Red" filter is actually pretty far red, out at 744 nm. For RGB purposes it's best to use the "orange" filter at 650 nm. So you want images whose filenames end in 82, 83, and 84 (orange, green, and blue filters in combination with a neutral density clear filter) or 22, 23, and 24 (orange, green, and blue filters in combination with a regular clear filter).

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