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Post by Marsrocks on May 7, 2010 19:45:13 GMT -5
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polluks
Anomaly Investigator
Crashsite Explorer
Posts: 245
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Post by polluks on Aug 13, 2012 7:36:17 GMT -5
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Post by Marsrocks on Aug 13, 2012 16:55:50 GMT -5
Polluks, you will need the L4, L5, and L6 to get a close approximation of correct color. You've got the L2 for red which is actually an infrared filter, and will not give you a correct result.
Also, sometimes we will see L2 used with L5 and L7 to get a relatively normal result.
The L7 is ultraviolet though - so it should not be as good as the L4, L5, L6 - as the L4 is close to red, and the L6 is closest to a true blue filter.
So use:
L4, L5, and L6
or
L2, L5, and L7
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Post by Marsrocks on Aug 13, 2012 17:12:51 GMT -5
If you are still having problems after trying the above, it may be a result of using different software, and you may have to experiment some.
Holger Isenberg and others will, for instance, add in multiple copies of the L5 through the green filter to try to normalize the result.
Others will adjust the percentage of red, blue, and green in the final render until they get a result which equals the colors we see on the calibration target. If you have to go to here, it will be trial and error for you until you get the proper color matching result, with each type of software rendering a bit differently.
Let me know what you get.
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Post by Marsrocks on Aug 13, 2012 17:22:38 GMT -5
Okay - I just checked the PDS, and I see the L4 and the L7 are both unavailable.
If you are doing this as a test case to learn how to do it, I would recommend going to another sol, and finding one of the normal combinations, before trying to get a decent result with what they have on 546.
Find a sol where they give you an L4, L5, and L6, or
L2, L5, and L7.
If you are determined to get the calibration correct on 546, you will find it very difficult. To do it, you will probably want to create a new image by combining and averaging the L5 and L2 shots. Then take that new image and add it into the red filter. It will still be off, but that may be the best you can do.
(Edit: oops, I see the L4 is available there - just not where I expected it to be - the L4 image is near the top of the list rather than in a group with the others near the bottom of the list - good job again to polluks for finding another image I couldn't find).
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polluks
Anomaly Investigator
Crashsite Explorer
Posts: 245
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Post by polluks on Aug 14, 2012 4:22:30 GMT -5
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Post by Marsrocks on Aug 14, 2012 7:41:08 GMT -5
Great job, polluks. Some day you're going to have to teach me what you are doing to find these images. Your skills there are obviously much better than mine!
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