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Jouni Tulkki wrote:

I've made a color image from the raw data available from NASA web
site. The image has been made using the following filters:

red channel: L4
green channel: L5
blue channel: L6

The image can be found at:
http://www.hut.fi/~jitulkki/mars/Sol007-1/Color.jpg

Until today all the color images have been made using filters L2, L5 &
L6. The problem is that L2 is an infrared filter so the images are not
true color. Apparently for this reason, nasa has recolored the images
to look more natural.

Blue rocks?

Mitchell Timin

I don't know. The colors are not true colors, because each channel
(red, green and blue) has been scaled to fill the entire scale (or so
I think). Since mars is mostly red, this means that green and
especially blue colors are exaggerated. The only thing that is certain
is that they are bluer then the surrounding sand. On the other hand,
the rocks are so brightly blue in the image, that they may well be
slightly blue in reality.