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  • Noise in 8-bit TIFs

    Help please!

    I shoot Raw and would like to be able to save my photos in 8-bit TIF format. The problem is that when I save that way, I end up with a bunch of introduced noise in the photos. If I save 16-bit the files are huge (126+ mb per photo), but they look good. Does anyone know a good way around this? Am I just doing something stupid? It doesn't matter if I'm saving in Photoshop or in Lightroom (both are latest versions).

    Can anyone help a girl out? I'm at my wit's end and need to have a good workflow that will give me good results!

    Thanks in advance.
    *Canon 5D MK II x2, 1 gripped
    *17-40 F4 L, 40-70 F2.8 L, 85 F1.2 L, 70-200 F2.8 L

  • #2
    are you using any kind of compression? I just played around in Photoshop CS5 and can't find a way to change from 8-bit to 16-bit so I don't have a way to see if I can reproduce the issue. You could always try saving PNG and see if that helps any?
    All Photos Taken With NikonD5100 & 35mm Prime. Love The Challenge!

    PhotosbyKyle.ca

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    • #3
      I can save PNG just fine, but that's not what I need to do. JPGs look fine, as do 16-bit TIFs, but 8-bit TIFs are noisy. I can also reduce the size of my images and they look just fine if I save 16-bit, but as soon as I try 8-bit, noise is introduced. There is no other compression being added to the files.

      Thanks for trying to help.
      *Canon 5D MK II x2, 1 gripped
      *17-40 F4 L, 40-70 F2.8 L, 85 F1.2 L, 70-200 F2.8 L

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      • #4
        I think it is logical that the quality of the image will be degraded as you decrease the color depth, by changing from 16 to 8 bit. Then you may see a little more noise and posterization. However, I believe that the difference should not be too noticeable, unless you are doing something else.

        Are you processing the pictures before saving them to 8-bit TIFs;? It may always be better to do processing in 16-bit and then saving it to 8-bit.

        Pablo

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        • #5
          You should ideally not see any change from 16-bit to 8-bit. After all, the 16-bit image is being displayed on a monitor with 8-bit color depth.

          More to the point, though, if saving in to some file format is producing poorer results than JPEG, something is going wrong. (GIF doesn't count.)

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