Amid the excitement of the Apollo 11 Moon
landing, another revelatory mission was gathering data about Mars.
A pair of spacecraft, Mariners 6 and 7, obtained closeups of selected
regions and lower resolution views of the entire planet as they
approached. This is the first color spacecraft photograph ever
made of Mars, taken by Mariner 7 in late July 1969. 244K
The original version of the first color photo
returned from the surface of Mars. In this first release the Viking
imaging team was initially unsure of the color of the sky and
told the JPL photolab to balance the sky color a neutral gray.
During the night shift the color balance somehow shifted towards
the blue and the result was a surprisingly Earthlike Mars, widely
reproduced in news magazines and television. While superseded
by later work, this was the first impression many had of what
our neighbor world looked like on the ground. A few people continue
to circulate claims that Mars really looks like this, generally
with conspiratorial overtones. 180K
A later color image of a similar
scene, with more of the lower field of view revealed. Note the
lighter 'subsoil' layer exposed by the lander descent engine at
the lower left. The overall neutral gray paint on the Viking lander
and the dull 'brass' like color of the soil sampler housing assist
in determining a reasonable color balance. 192K
Viking 1 returned color images of its rocky surroundings
in sections over time. Here is a composite of the camera 2 color
images made with similar lighting conditions, with an artistically
added sky. 128K.
This Viking 2 panorama was assembled from two images
taken on somewhat different times of day. The tilt of the spacecraft
is partially corrected by use of 'shear' filter in Photoshop.
In retrospact, despite great effort using visual and radar data
of the landing sites available at the time, both landers ended
up among the rockiest places on the planet! 772K
Soil
colors in the vicinity of the Pathfinder lander, recolored from
the original garish enhanced version to more closely approximate
the probable colors of Mars under neutral white lighting. 200K
Pathfinder's panorama, shown here with some effort
to show something resembling the true colors of the scenery and
sky. This was done as a background to an animation so the Rover
has not driven to the large rock 'Yogi' yet! The pre rover deployment
panorama was used to 'fill in' the ground later marked up by the
little rover. 248K
MER-A obtained these partial color panoramas looking
across the crater 'Boneville' from two locations along the rim.
The lighting changed in the interval between both panoramas, bringing
out the textures along the crater floor as the shadows lengthened.
140K
On
April 30 the MER-B rover ('Opportunity') obtained color images
of the sunset with the L4, 5, and 6 filters which when combined
provide an image with reasonable color fidelity. The original
images, including the green (L5) filtered image seen
here, caught half the inner twilight glow, with the right
edge of the frame just catching the setting Sun. I first registered
the Sun, which moved between the exposures, and the inner glows
to the green image and obtained a plausable looking match in all
3 colors. I then 'mirrored' the frame and placed it so the Sun
was a circle partially revealed from both sides. I then artistically
'filled in' the narrow middle strip of missing data. This supercedes
earlier similar images based on grayscale images. 96K.
This twilight panorama was obtained by MER-B. This
image was hand colorised from a trio of gray scale images made
with the wide angle NAVCAM on sol 101. Thin high blueish clouds
can be seen looming above the dusty lower atmosphere. 52K
The succesful part of the recent European Mars mission, the European Space Agency 'Mars Express' spacecraft, carries a high quality multispectral camera which promises a rich harvest of pseudo color Mars images in the coming years. This color image of the Gusev landing site region as been adjusted from the garish original release seen here. to more closely match the probable colors, in the overexposed fashion one might see through a super telescope or visually from orbit. The dark regions which appear blue or even green in some images are exposed dark gray basaltic rock, which when particularly free of dust often appears a dark neutral gray. Another newer version of a color balance resembling the 'ground view' of the colors of the surface seen by the 'Spirit' rover can be seen here. 252K
This oblique view of Olympus Mons was altered by 'bending' the image to suggest the curvature of the horizon of Mars, and the gray scale image was 'colorised' to roughly approximate natural color. 124K