Frostbyte
Senior Member
Still learnin' cuz I don't know, what it is, that I don't know!
Posts: 146
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Post by Frostbyte on Dec 26, 2011 1:49:50 GMT
I just got the Topaz Bundle as a Christmas present. With this image I'm learning about JPEG Artifiacts and how to remove them using DeJpeg. It appears so far that every picture I took before getting my DSLR and shooting RAW has JPEG artifacts and a number of them have white or black halos from the in-camera conversion to JPEG. This image didn't have much of a problem with halos but did have artifacts (which I could see when I pixel-peep) which DeJpeg removed.  Topaz Adjust helped bring out the texture of the wood grain. |
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Post by Barry on Dec 26, 2011 9:31:27 GMT
It would be good to see a cropped in section of before and after if that was possible.
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Frostbyte
Senior Member
Still learnin' cuz I don't know, what it is, that I don't know!
Posts: 146
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Post by Frostbyte on Dec 26, 2011 14:05:39 GMT
It would be good to see a cropped in section of before and after if that was possible. Here is a cropped section SOOC:  After DeJpeg:  And after PP, as seen above:  This image had very little mosquito noise and almost no checkerboarding but you can see the compression (luma and color noise) artifacts. I'm just starting to get familiar with DeJpeg so I hope to get better at dealing with the in-camera JPEG compression issues. Hope this helps! |
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Post by Barry on Dec 26, 2011 14:27:45 GMT
Nice to see all of the effects before and after. It will be interesting to hear how this software effects your prints.
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Post by Steaphany on Dec 26, 2011 14:31:40 GMT
I've played with DeJpeg, but the best solution is to shoot Raw. My pre-dSLR shots are preserved as my personal collection, but too far gone to invest the time necessary. The JPG 8 bit image depth also lacks too much to really work with.
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Frostbyte
Senior Member
Still learnin' cuz I don't know, what it is, that I don't know!
Posts: 146
|
Post by Frostbyte on Dec 26, 2011 14:58:52 GMT
I've played with DeJpeg, but the best solution is to shoot Raw. My pre-dSLR shots are preserved as my personal collection, but too far gone to invest the time necessary. The JPG 8 bit image depth also lacks too much to really work with. I agree, but for most of these images I can't go back and reshoot with the DSLR so I'm doing what I can with what I have. |
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Post by The Wirefox on Dec 26, 2011 16:32:49 GMT
Not sure how DeJpeg works but it looks as if it is blurring the areas away from the edges and leaving the pixels in close proximity to perceived edges intact. In fact it looks as if it also applies selective sharpening based on the inverse parameters. I am not actually seeing any haloing in this particular image...and I would not expect to even with jpeg. In fact unless the camera has perfect lighting conditions in which to shoot you will get this type of 'grain', 'noise' what you will with raw hence the reason for raw converters having a denoise function. What it seems to be emulating is the an intelligent application of denoise function in the raw converter.
It would be interesting to see what further lossy file degradation would do to the image. I would recommend that you save the DeJpeg treated master file as .tiff to prevent further degradation.
Hope you had a great Christmas Frank
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