"b" wrote in message
...
The reason that the color wheel looks off is that pictures red component
was taken from the 750nm (near-IR) filter, instead of the red filter at
673nm. In near IR, the blue corner is extremely reflective and so looks
pink

If people really wantg to try their own color balance, one could get the raw
images from, for example:

http://marsrovers.jpl.nasa.gov/galle...irit_p002.html

There is in that collection a series of shots of the color wheel, with file
names:

http://marsrovers.jpl.nasa.gov/galle...0P2100L2M1.JPG
http://marsrovers.jpl.nasa.gov/galle...0P2100L5M1.JPG
http://marsrovers.jpl.nasa.gov/galle...0P2100L6M1.JPG

That is a series of three shots, from MER 1 (M1), left camera (L), filters
L2, L5 and L6 which is roughly red, green, blue.

According to the pancam technical document at
http://athena.cornell.edu/pdf/tb_pancam.pdf the filters' central wavelengths
and bandpasses are as follows (nanometers):

LEFT CAMERA/ RIGHT CAMERA


L1. EMPTY R1. 430 (SP) *

L2. 750 (20) R2. 750 (20)

L3. 670 (20) R3. 800 (20)

L4. 600 (20) R4. 860 (25)

L5. 530 (20) R5. 900 (25)

L6. 480 (25) R6. 930 (30)

L7. 430 (SP)* R7. 980 (LP)*

L8. 440 Solar ND R8. 880 Solar ND


*SP indicates short-pass filter; LP indicates long-pass filter

http://eosweb.larc.nasa.gov/EDDOCS/W...or_Colors.html