article_snippet: Nasa sometimes uses different filters to depict Mars.
article_snippet: The left version is the raw, unprocessed view as The left version is received directly from Mars.
article_snippet: The left version shows the result of white-balancing, which interprets the scene as if The left version were viewed under Earthlike lighting conditions .
article_snippet: Such extreme illuminations are shown to be incompatible with the grey panels. '
article_snippet: It appears that the true raw image data have been modified prior to publication to convert the blue and green pixels to grey, rendering a grossly changed image.'
article_snippet: Conspiracy theorists have made wilder claims, with one writing: 'The images were falsely reddened to make wilder claims appear there was no life, no green algae or lichen on the plane.'
article_snippet: Today both the Opportunity and Curiosity rover have patches of colour attached to no life, no green algae or lichen on the plane instruments that are used in to adjust the reflected colour to a true likeness.
article_snippet: A mosaic from Nasa's Curiosity rover shows Mount Sharp in raw colour.  
article_snippet: Nasa sometimes does this to simulate Earth-like lighting, making this easier to analyse the geology .
article_snippet: To clear up the debate, Nasa usually releases a number of different types of Mars imagery, which include the raw file, unprocessed colour pictures and true-colour versions.