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: 4404 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 2 2008, 10:08 PM
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
Hi,
Just my small contribution to this topic. Here's a quick processing of the Proteus image. I was completelly conservative on appliying gausian blur filters to reduce noise and levels adjustment. There's some cliping of the darkest parts of the image in an atempt to reduce uncertain details at high noise levels. The general details visible on Ted's images are present, and a hint of the finer ones. I think that the issue here is the balance between further processing and the introduction of processing artifacts. It's a complicated decision and is related to image scale and sampling. -------------------- _______________________
www.astrosurf.com/nunes |
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Sep 3 2008, 12:04 AM
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Hi, Just my small contribution to this topic. Here's a quick processing of the Proteus image. I was completelly conservative on appliying gausian blur filters to reduce noise and levels adjustment. There's some cliping of the darkest parts of the image in an atempt to reduce uncertain details at high noise levels. The general details visible on Ted's images are present, and a hint of the finer ones. I think that the issue here is the balance between further processing and the introduction of processing artifacts. It's a complicated decision and is related to image scale and sampling. 4throck, what I have basically done is combined that with the sharp high contrast features (such as the limb and terminator features) that did not require any blur to make clear. -------------------- |
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