Vignetting, discussion about methods of resolution Options

[Tman]

Hi Nirgal and all, I would like to discuss about vignetting and methods of resolution for it. I'm mainly interested in mathematical methods that could automatically calculate and adjust the right grey value for each pixel in a single picture.

My current method works with more or less transparent layers over the original picture that so roughly are able to balance the grey values. A perfect layer have to be the exact inverted brightness difference of each picture with this shadow effects. This method is very effective if you get the correct inverted values. These shots of the Mars sky come nearly at such a perfect mask, but not always. And of course the center of the pictures lose much of theirs original brightness/luminance sadly.

I have in mind a mathematical method that can adjust each grey value in a pic in order to obtain a completely balanced brightness over the entire picture. But I'm not in the position to reach that. I only know one have to start with the calculation of the grey values in the center of the picture. In the center are quasi the reference values of the whole picture, if I'm correct.
Is there a possibility (mathematical method) to get (roughly) the same brightness and luminance like in the center over the whole picture from the MERs?

Greetings, Peter

[MichaelT]

Hi,

I put an updated version of the anti-vignetting program online. I corrected some minor errors and it now supports output as 16-bit-TIFF. That way one can do all the adjusting after the anti-vignetting process wihtout loosing any information. As usual it is a precompiled IDL-program and can be used with RSI's Virtual Machine (see earlier posts).
You can find the program here: http://www.muk.uni-hannover.de/~theusner/mars/anti_vig.sav

Tman pointed me to the fact that some people are already using that program, and the results really look nice. As I was in the final stages of PhD-thesis-writing until mid-October, I had not noticed that so far But now I am done

Anyway, I would not mind input from the users. Is there something that you would like to be improved?

Bob: Did you scan any images so far?

Michael

[Tesheiner]

Anyway, I would not mind input from the users. Is there something that you would like to be improved?

Michael, consider this as a letter to Santa Claus...

"I want a standalone version without IDL dependency".