Morning Frost - False Color

Scaled Image

Image Credit: NASA/JPL/ASU

About this image

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Today's false color image shows several craters in Eridania Planitia. The small crater inside the larger crater is Gasa Crater. The larger crater is unnamed. The bright silver-blue region on the inner and outer crater rim is morning frost. Collected during the winter, south facing slopes stay in shadow and retain frost longer than the rest of the rim already in sunlight. Frosts are only identifiable in multi filter images.

The THEMIS VIS camera is capable of capturing color images of the Martian surface using five different color filters. In this mode of operation, the spatial resolution and coverage of the image must be reduced to accommodate the additional data volume produced from using multiple filters. To make a color image, three of the five filter images (each in grayscale) are selected. Each is contrast enhanced and then converted to a red, green, or blue intensity image. These three images are then combined to produce a full color, single image. Because the THEMIS color filters don't span the full range of colors seen by the human eye, a color THEMIS image does not represent true color. Also, because each single-filter image is contrast enhanced before inclusion in the three-color image, the apparent color variation of the scene is exaggerated. Nevertheless, the color variation that does appear is representative of some change in color, however subtle, in the actual scene. Note that the long edges of THEMIS color images typically contain color artifacts that do not represent surface variation.

Please see the THEMIS Data Citation Note for details on crediting THEMIS images. 


Image ID: 
V88618003 (View data in Mars Image Explorer)
2021-12-06 02:28
Thu, 2022-06-23
512 pixels (17 km)
1824 pixels (61 km)
0.033962 km/pixel
0.0344979 km/pixel


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