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Thread: white spots on jpeg

  1. #1
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    Default white spots on jpeg

    Hi guys,

    After scanning my negs, I view the jpegs on my laptop, and for several images there are white specks here and there.

    What are they? dust?



    Douglas

  2. #2

    Default Re: white spots on jpeg

    Could be dust could be the scanner algorithm itself. Try sacnning them to tiff or some other uncompressed format as they could also be compression artifacts?
    Furry Photos - Photography for the Modern Pet

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    Default Re: white spots on jpeg

    wow, dont use so cheem technical terms..I believe its the scanner got dust? CSers who scan their negs: do you find white specks of dust on ur jpegs after scanning?

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    Default Re: white spots on jpeg

    i dont think posting will be of any good....by the size i resize to get 100KB, its really like 3R on the screen, cant see..

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    Default Re: white spots on jpeg

    Quote Originally Posted by doug3fflux
    i dont think posting will be of any good....by the size i resize to get 100KB, its really like 3R on the screen, cant see..
    Crop some affected areas?

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    Default Re: white spots on jpeg

    okies

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    Default Re: white spots on jpeg

    arg. i not good with this bmp file stuff.

    i give u link.

    http://doug3fflux.myphotoalbum.com/v...d=F1010003_JPG

    due to some 'problem' with the scanning/developing service for this particular batch of film I sent, the white specks became GREATER in QUANTITY and more WIDESPREAD across the neg. previous dev/scan dont have, only have 1 or 2 inconspicuous specks.

    comment!!

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    Default Re: white spots on jpeg

    scroll over to the right flank of the image and look at the white specks.

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    Default Re: white spots on jpeg

    anyone??

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    Default Re: white spots on jpeg

    Quote Originally Posted by doug3fflux
    scroll over to the right flank of the image and look at the white specks.
    Looks like dust to me. I don't think it is due to any kind of numerical processing, the shapes of the spots are way too irregular.

    Also, the "texture" of the scan looks a bit strange, resembling colour printing rasters. If you hadn't told us it's a scan from a negative, I would have guessed it's a scan from a book/magazine page - and the white stains would be dust and/or abrasion on the original.

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    Default Re: white spots on jpeg

    so its dust? thanks for the info.

  12. #12

    Default Re: white spots on jpeg

    maybe dandruff..

    but then if u do a testshot again..see if it still appears

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    Default Re: white spots on jpeg

    lol dandruff....can be leh..but not mine!! haha..its the guy at the photoshop...lol..

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    Default Re: white spots on jpeg

    Quote Originally Posted by doug3fflux
    so its dust? thanks for the info.
    The dust theory appears most plausible to me, but I wouldn't categorically exclude other explanations. That would be unscientific.

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    Default Re: white spots on jpeg

    Quote Originally Posted by LittleWolf
    The dust theory appears most plausible to me, but I wouldn't categorically exclude other explanations. That would be unscientific.
    wow thanks!

  16. #16

    Default Re: white spots on jpeg

    it's dust.
    Black on negs is white after u invert the colours.

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    Default Re: white spots on jpeg

    oaky thanks AReality and wolf. now I noe its a dusty scanning job done, because initially I could not find the root of the issue. Thanks agn.

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    Default Re: white spots on jpeg

    so to those who employ neg scanning services, do u encounter this dusty problems?

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    Default Re: white spots on jpeg

    anyone?

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    Default Re: white spots on jpeg

    Quote Originally Posted by doug3fflux
    so to those who employ neg scanning services, do u encounter this dusty problems?
    I'm not scanning negatives, so I cannot really comment. In the pre-digital enlarger days, one would try to keep the film, the negative stage, and the paper clean (soft brushes, clean compressed air) to get the number of dust particles down and, if necessary, retouch the prints.

    If the dust doesn't come off the negative easily, it might be partially embedded into the film gelatin. Attempts to remove it from the dry film might cause more damage. Also, the dust might be in the scanner. To find out, one could compare scans from different frames in the film and see how similar the dust patterns are.

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