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Photograph from Mobile Developer Summit 2011 held in Bangalore, India, 2-3 November 2011, produced by Saltmarch Media. Photograph ©Copyright Saltmarch Media. Non-commercial use permitted with attribution and linkback to this page on Saltmarch's Flickr photostream. All other rights reserved.
Photograph from Mobile Developer Summit 2011 held in Bangalore, India, 2-3 November 2011, produced by Saltmarch Media. Photograph ©Copyright Saltmarch Media. Non-commercial use permitted with attribution and linkback to this page on Saltmarch's Flickr photostream. All other rights reserved.
Photograph from Mobile Developer Summit 2011 held in Bangalore, India, 2-3 November 2011, produced by Saltmarch Media. Photograph ©Copyright Saltmarch Media. Non-commercial use permitted with attribution and linkback to this page on Saltmarch's Flickr photostream. All other rights reserved.
Photograph from Mobile Developer Summit 2011 held in Bangalore, India, 2-3 November 2011, produced by Saltmarch Media. Photograph ©Copyright Saltmarch Media. Non-commercial use permitted with attribution and linkback to this page on Saltmarch's Flickr photostream. All other rights reserved.
Photograph from Mobile Developer Summit 2011 held in Bangalore, India, 2-3 November 2011, produced by Saltmarch Media. Photograph ©Copyright Saltmarch Media. Non-commercial use permitted with attribution and linkback to this page on Saltmarch's Flickr photostream. All other rights reserved.
MEX VMC July 11 2009 image of the Tharsis Montes, Mars
This HDR composite of MEX-VMC images taken on July 11, 2009 shows many volcanoes of the Tharsis bulge on Mars. From left to right: Arsia Mons (with cloud), Pavonis Mons, Ascraeus Mons, Ceraunius Tholus (small dark dot), and Uranius Mons (larger subtle patch to the right of Ceraunius Tholus). A labeled zoom can be seen here (links to flickr page: www.flickr.com/photos/31678681@N07/3872170986/in/set-7215... ) .Compare with the October 2008 image prepared by Bogdan Stancescu that also shows the Tharsis Montes: webservices.esa.int/blog/post/6/782
To make the image, the MEX VMC raw images were converted to RGB .png files using Gordan Ugarkovic’s VMC2RGB.exe utility (downloadable here: www.unmannedspaceflight.com/index.php?s=&showtopic=54... )
Four images with differing exposure setting were then loaded into Photoshop a photoshop layer stack with the dimmest image at the bottom and brightest at the top.
The selected images were:
09_192_14.14.37_VMC_Img_No_33_rgb.png
09_192_14.13.44_VMC_Img_No_32_rgb.png
09_192_14.12.50_VMC_Img_No_31_rgb.png
09_192_14.11.57_VMC_Img_No_30_rgb.png
The images were converted to 16-bit RGB mode. The images were then manually aligned with the lowest image on the stack. To make this easier, key surface features were used, in this case Ascraeus Mons and Ceraunius Tholus. Control points were set at the dark sky, the brightest part of the limb, a midpoint in the plain, and at the bright cloud near Arsia Mons. The contrast levels for each image in the layer stack was set with a black point (dark sky) at [5,5,5] and the brightest limb point set at (210,190,150). Layer masks were added to each image in the stack. To make a layer mask, the brightest section of the image was selected by using the Magic Wand tool starting at the bright point (limb) with a wand tolerance set at 20. The selection was expanded 10 pixels, then filled in the layer mask with black ink using the Paintbucket. The entire mask was Gaussian blurred by 10 pixels. Next the brush tool was used to manually add either black ink or white ink to the mask. The stroke was generally along the crescent with a large brush and low flow and opacity. The layer opacity was then adjusted for best blending. Layer masking was repeated in the layer stack starting from the lowest to the highest (brightest). In this particular case, the darkest member of the sequence (09_192_14.11.57_VMC_Img_No_30_rgb.png) was not used.
Following the masking, a global Levels and Curves layer was added, followed by a Hue/Saturation layer. The Saturation was increased to about 40. Initial adjustments were made to the levels and curves layer. Next, a combine all layer was converted to a Hi-Pass filter overlay (3.5 pixel value) with the blend mode set at “Overlay”. The curves and levels were adjusted so that the resulting coloring and contrast approximated Ted Stryk’s MEX-VMC image (available here: webservices.esa.int/blog/resource/6/5887 )
Finally, the combined image was created as a new layer and the clone stamp tool used to remove the known camera artifacts. A layer mask and black background were added to clip out the areas lacking proper image overlap.
The steps of the process, including thumbnails of the original images and manually created layer masks is shown here (links to flickr): www.flickr.com/photos/31678681@N07/3872171048/in/set-7215...
An image of the final layer stack in Photoshop can be seen here, along with control point location (links to flickr):
www.flickr.com/photos/31678681@N07/3872171068/in/set-7215...
Image credits: ESA/Mike Malaska