Reprocessing Historical Images - II, Restoring images from antiquated and/or poor quality sources |
Reprocessing Historical Images - II, Restoring images from antiquated and/or poor quality sources |
Aug 29 2008, 03:34 PM
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Interplanetary Dumpster Diver Group: Admin Posts: 4405 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I figure that it is time for another thread like this. I still find it astonishing to see the versions of a lot of images that are reproduced over and over again. For example, this is the last mosaic of Triton taken before the close encounter began. The version on the Planetary Photojournal is on the left, my version on the right. Clearly, this image was produced as part of the "instant science" campaign. They did a superb job getting images to the public in a speedy manner, but they are extremely rough, since the team was busy running the spacecraft. However, it is this version that keeps being recycled. Worse, the version on the photojournal is clearly scanned from a printed copy, causing further degradation.
Here is a similar comparison, this time using Proteus (still 1989N-1 on the Planetary Photojournal!). This discussion started in the thread about Viking crescents but was getting off topic, so I thought I would start a new thread here. -------------------- |
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Sep 19 2008, 12:39 AM
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Member Group: Members Posts: 104 Joined: 1-June 08 Member No.: 4172 |
I decided to take a look at the Proteus image as well. My goal when processing these is aesthetic in nature: create an image that looks like a moon, not a flat bumpy rectangular thing. The main difference between this image and better images is in the frequency histogram, aka the Fourier Transform. Correct that, and the image looks a lot more real. Therefore, the main operation I used was a low-pass filter to enhance the feeling of sphericalness and decrease noise, all while keeping enough small-scale details. Below is an animated gif showing three steps: a stretched, dereseaued, and deposterized (is that a word?) version of Ted's calibrated base, a sharpened and medium-pass enhanced version of the base, and the final product.
Below is an upscaled (SmartEdge algorithm) version. |
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