From: "aa27100" <antonio.agnesi@unipv.it>

Date: February 15, 2010 12:11:23 AM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: Mars: RGB vs L(IR)RGB

Thanks Alan (and Willie, Milton)!

How do you weigh the color channels captured through RGB filters? I usually tend to calibrate the white point on the "white" feature of the image (polar cap on Mars, rings on Saturn, white bands on Jupiter). Maybe taking a picture of a sunlit white sheet of paper is a better way to have an absolute calibration... (not sure about what to do with the IR)

Thanks for your valuable suggestions!

Antonio

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