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Photo Restoration Repairing damaged photos

Quick De-cracking Action results

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  #11  
Old 12-09-2001, 06:24 AM
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Ed_L Ed_L is offline
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Hey Debbie,

You really put it through it's paces. Interesting results for sure.

Ed
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  #12  
Old 12-10-2001, 08:31 PM
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Tim Edwards Tim Edwards is offline
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Unhappy oops! Missed this thread!

Debbie,

Sorry, I just noticed the thread... I'll take a deeper look, but some initial thoughts:

The Decrack action's intent is to isolate high-contrast noise and fill it with the 'minimum' filter, leaving the rest of the image alone if possible. The setting does not affect how quickly large cracks are filled, it simply determines how large and contrasty edges must be to be found. So, if you run the Decrack action at 0.4 for 3 iterations, you'll get the same amount of fill in large cracks as if you ran it at 1.5 the same number of times, but you'll have less impact on the actual image (assuming it's of low enough contrast).

Another limitation is that the filter uses the minimum filter to fill damage, meaning that it will grab dark values from nearby. Thus, dark damage will be amplified...

The first image looks like it has both the light/dark damage problem as well as having high-contrast elements in the image itself...

_Tim
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  #13  
Old 12-10-2001, 08:39 PM
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Smile

Tim
I ran each version only once. I know the large cracks wouldn't be affected much and like I said, I love what it does when it works. My curiosity was on the first photo where I ran all 3 levels, one on each copy from the weakest to the heaviest setting but for sorme reason they all seem the same. I would have figured the difference would have been more noticable. Don't mistake my little observation as a put down. You did say it worked best under certain circumstances and I am thouroughly impressed with the results when it does work. It's still a valuable tool and one I shall use often, I'm sure. I was just curious and figured you would know what had happened in these situations. Thanks for responding Tim. I know sometimes these threads hide and I don't know why.
DJ
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  #14  
Old 12-11-2001, 08:25 AM
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Tim Edwards Tim Edwards is offline
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an animation

Debbie,

Here's an animation of the two extreme settings, 0.4 and 4.0, on your first example. I think the differences will be clear to you... They've been highlighted with a hue shift. Note that the 0.4 setting affects less of the actual image.

Sorry, the full-sized version was too big to upload, so I cropped and downshifted.

I don't mind the questions or observations... Maybe I can actually improve the thing!

_Tim
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File Type: gif decrack_anim.gif (96.8 KB, 70 views)
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  #15  
Old 12-11-2001, 11:44 AM
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OH Wow, I can see the difference now. It was hard to see the difference on my versions although I knew it should be there. That really brings it out well. Thanks Tim.
DJ
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