You need to upgrade your Flash Player The theme of this blog is not only and obviously space, but in particular “terrestrial worlds”, places that tend to have surfaces on which one could walk or at least attach oneself to. These places sometimes also have other earth-like familiar features such as atmospheres, weather, volcanos, geysers and perhaps, we are finding, even exotic oceans, rivers or lakes that are not necessarily made of familiar materials we are used to here at home. The second theme is imagery. Occasionally I do some retouching of images when needed if an image is incomplete or sometimes “dirty” or noisy. I will attempt to correct image shortcomings based upon other images or well-accepted presumed attributes. When this is done, notes will be offered as to what was added, why and sometimes how it was done. This way no one should ever wonder if something they are looking at is real or photoshop.

Io Aglow

Io Night Side Eruption Map

This is a bit old taken from February 2007’s New Horizons encounter at Jupiter. A very noisy image was released of Io on the dark side of Jupiter that illustrated the glowing lights of lava flows and auroral displays in Io’s tenuous atmosphere interacting with Jupiter’s magnetosphere. Original Noisy Image of Io AglowNoise always bothers me and there has been a desire to somehow clean up the presentation of this fantastic image.

The process was simply to blur the image, layer highlight information a few times with varying degrees of sharpness or blur and to simply hand remove what would seem to be simply noise artifacts. The problem is that some of this information wasn’t just noise, but is actually auroral glow (especially at the disk edge). So after some of the noise was removed it was softened and re-introduced selectively around active areas where the assumption is that the glow near these spots is more intense. The final step was to simply reduce the file size so that it became sharper.

This presentation is purely artistic although it does come from real image data… I just wouldn’t use it to support any scientific papers. The items marked simply as “volcano” were newly discovered by New Horizons.

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