Full Color Sets
MESSENGER MDIS 11 Filter Color Test Images
The MDIS camera was able to acquire critical test images
through 11 filters during portions of the Earth flyby.
Since each image with a different filter
is taken about 5 seconds apart, there are slight offsets from
frame to frame within a single color set. Two different
three-filter combinations were processed such that each
filter was registered to within 1/10 of a pixel of
each other.
The first color picture in each row of the
table was formed by compositing the co-registered
C, D, and E filters
(480, 560, 630 nm) to form a "natural" color
image. Of course, natural color is in the eye of the beholder,
everybody sees colors a little differently, and the
filters do not exactly match average human color
sensitivity, but they come pretty close.
The second color version
shows us the Earth in a combination of visible and near-infrared
light (D, E, and G filters). Continents
appear red because chlorophyll in vegetation is highly reflective
in the near-infrared.
The Earth departure movie frames
were taken only in the three visible-light filters.
If you want to try your hand at making different color composites,
all 11-filter images are available to the right of the
composites. Remember that to get really sharp images, you
may need to shift the filters relative to each other a small amount
using your favorite image manipulation software.
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