File:Alga Crater rim – comparing processing techniques ESA24757984.png
Size of this preview: 600 × 600 pixels. Other resolutions: 240 × 240 pixels | 480 × 480 pixels | 768 × 768 pixels | 1,024 × 1,024 pixels | 2,048 × 2,048 pixels | 3,000 × 3,000 pixels.
Original file (3,000 × 3,000 pixels, file size: 10.76 MB, MIME type: image/png)
File information
Structured data
Captions
Summary edit
DescriptionAlga Crater rim – comparing processing techniques ESA24757984.png |
English: This image taken by the Colour and Stereo Surface Imaging System (CaSSIS) onboard the ExoMars Trace Gas Orbiter shows part of Alga Crater rim. The image was acquired on 28 January 2021. Alga Crater is located in the southern highlands of Mars and is well-known for its colour diversity. The top image is a crude red-green-blue (RGB) representation of the scene. But because CaSSIS doesn’t have the same red, green, and blue filters as a smartphone camera and is sensitive to infrared light invisible to humans, the shade of red is different from what you would see with your eyes, appearing more orange than yellow. Below is the same scene shown with CaSSIS standard processing to accentuate the colour diversity of the martian surface. This is the so-called ‘NPB’ product, which puts the near-infrared filter (NIR, N) covering the longest wavelengths in the red channel of the display, the panchromatic filter (PAN, P) in the green channel, and the blue filter (BLU, B) in the blue channel. In addition, each filter image is ‘stretched’, meaning that the image is re-scaled between the minimum and maximum brightness within each colour before combining them to produce the resulting image. While the top image does show some colour changes, they really stand out in the lower image. Bluer tones are more dust covered. The greenish colours are typically mafic minerals such as magnesium and/or iron-rich silicates, although spectroscopy is required to provide the most accurate identification. The image is centred at 333.3ºE / 24.5ºS. North is roughly to the left. Read more about how CaSSIS reveals the colour diversity of Mars here |
Date | 17 March 2023 (upload date) |
Source | Alga Crater rim – comparing processing techniques |
Author | ESA/TGO/CaSSIS |
Other versions |
|
Activity InfoField | Space Science |
Keyword InfoField | Crater Mars Images Mineral deposits |
Mission InfoField | ExoMars |
Licensing edit
This media was created by the European Space Agency (ESA).
Where expressly so stated, images or videos are covered by the Creative Commons Attribution-ShareAlike 3.0 IGO (CC BY-SA 3.0 IGO) licence, ESA being an Intergovernmental Organisation (IGO), as defined by the CC BY-SA 3.0 IGO licence. The user is allowed under the terms and conditions of the CC BY-SA 3.0 IGO license to Reproduce, Distribute and Publicly Perform the ESA images and videos released under CC BY-SA 3.0 IGO licence and the Adaptations thereof, without further explicit permission being necessary, for as long as the user complies with the conditions and restrictions set forth in the CC BY-SA 3.0 IGO licence, these including that:
See the ESA Creative Commons copyright notice for complete information, and this article for additional details.
|
||
This file is licensed under the Creative Commons Attribution-ShareAlike 3.0 IGO license. Attribution: ESA/TGO/CaSSIS, CC BY-SA IGO 3.0
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 17:46, 4 April 2023 | 3,000 × 3,000 (10.76 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2023/03/alga_crater_rim_comparing_processing_techniques/24757973-1-eng-GB/Alga_Crater_rim_comparing_processing_techniques.png via Commons:Spacemedia |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.