Reprocessing Historical Images - II, Restoring images from antiquated and/or poor quality sources Options

[tedstryk]

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.

[vk3ukf]

The sources were all from the net from various places, I was trying to find all the Mariner 4 frames, which I eventually all found on a NASA cd somewhere, but prior to that, there were a few versions of the same image at various websites on my PC, I didn't know which was the original until I went to NASA and got the lot. Anyway, the other versions, perhaps one from one of your own sites, if you have done this before, were different contrast levels, one was bw way stretched, to see the max extent of the atmosphere.
The filenames weren't changed much, MA4-01e.gif become MA4-01d.gif on another example and a MA4-01h.gif as well.
So I played around with making different bands from the one image, using the contrast levels to separate them.
I used a mix of the different contrast versions from various paces on the web, I'm sorry, I can't remember from where, and the original image MA4-01e.gif from NASA.

edit:
I had a look around the hd and found,

The original NASA filename is Ma4-01E.gif
The high contrast version is m04_01h.gif, it's a bit different. ? a replaced with 0.
Did a google search for m04_01h.gif

Found it and m04_01d.gif at

http://library.thinkquest.org/19455/marine...age_gallery.htm

and looking at it, I have no idea how they got that from the original.
There isn't any detail about how the images were made.

Perhaps the person that made it, did it from a print out of the original numbers.

Do those files of the numbers for the images exist anywhere accessible to the public.
It would be like having a RAW file.

All I had to play with is the NASA gif and what I found elsewhere.

I found another image the same as m04_01d.gif
It is named nssdc_MR_Mrnr_m04_01d.gif

Well, whomever did the job on those numbers did it pretty good, (drool)

Google could not find a nssdc_MR_Mrnr_m04_01d.gif nor a nssdc_MR_Mrnr_m04_01h.gif

I have no idea where nssdc_MR_Mrnr_m04_01d.gif came from. But it is the same image as m04_01d.gif from thinkquest.

I'll try and reproduce what I did.



Edit again:
I put all the images I found on the same page as the colour pic.
http://www.vk3ukf.com/Mars/Mariner/Mariner...one_page_01.htm

[tedstryk]

I think they come from http://nssdc.gsfc.nasa.gov/imgcat/html/obj...ge/m04_01d.html