File:Mars Viking 12a240.png

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Summary

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Description Viking 1 lander image of a martian sunset over Chryse Planitia. In this image the sun is 2 degrees below the local horizon. The banding in the sky is an artifact produced by the incremental brightness levels of the camera. This image was taken on the 30th martian day (sol) after touchdown, at 19:13 local time (10:40:31 on 20 August 1976 (UTC)). The camera is pointing towards the southwest.
Date 2009-01-24; original photos were taken 1976-08-20.
Source Own work based on images in the NASA Viking image archive
Author "Roel van der Hoorn (Van der Hoorn)"
Permission
(Reusing this file)		 I used the original 12a240.blu, 12a240.grn and 12a240.red images from the NASA Viking image archive, converted them to .png, manually removed the noise, merged them into one image (almost matching true color; see here for the channel mixing process) and finally increased the brightness with 35. Except for the conversion, this was done in Adobe Photoshop CS2. The original file by NASA is in the public domain, and so is this new one.
Other versions I created this image as a replacement for the image Viking sunset.jpg (see also here). This file was created by NASA, but the quality was not very high. Using the original pictures from the Lander archive resulted in a higher quality image.

Licensing

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Public domain This work has been released into the public domain by its author, Van der Hoorn at English Wikipedia. This applies worldwide.
In some countries this may not be legally possible; if so:
Van der Hoorn grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

The image is based on an original image from NASA to which the following copyright statement is applicable:

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current16:44, 24 January 2009Thumbnail for version as of 16:44, 24 January 2009999 × 512 (188 KB)Van der Hoorn (talk | contribs)== Summary == {{Information |Description = Viking 1 lander image of a martian sunset over Chryse Planitia. In this image the sun is 2 degrees below the local horizon. The banding in the sky is an artifact produced by the incremental brightness levels of t

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