Hannes Griebel: Mars Express Limb Observation - The images used are based on the raw images and were processed in the following way: 1. the Moiré pattern was removed, 2. the color saturation was adjusted, 3. the clarity (contrast) was enhanced. The brightness distribution accross a single image is a camera effect and has not been removed. The streak appearing in each image is an artifact (perhaps on the camera lens). To make the mosaic the individual pictures were geometrically corrected to match a map. Images towards the equator are larger in coverage but lower in resolution as the spacecraft moves away from the planet. A screenshot from the MAPPS science planning software shows the approximate position of the spacecraft for the observation and annotations showing what is visible have been added. Note clouds and dust in the atmosphere! Image Credits: Hannes Griebel/ESA