• Adobe After Effects

  how to fix a horrible duotone noisy image

  Posted by Munchkinpie on August 25, 2005 at 4:08 pm

  I have to fix a small res photograph that has duotone look and white spots all over the images

  I don’t want it to be to blurry
  smart blur in photoshop makes the image not look like a photo anymore
  and remove grain in AE doesnt do much either, its either too blurry or still look the same like it was before

  is there any other way?
  please help me…

  Munchkinpie replied 21 years ago 3 Members · 3 Replies
• 3 Replies

• 

  Jeff Cochran

  August 25, 2005 at 9:33 pm

  A couple of things to try. Convert your image to RGB and applie just enough guassian blur to each channel to remove the noise. After you’ve blurred each channel, then run an Unsharp mask over the image. Another filter to try is despeckle under noise. Try that on each individual channel and then an unsharp mask.

  This will only work depending on the size and quality of the image. If you have trouble, you may want to rescan the image at a larger size and resoulution, then res down afterward.

  Jeff Cochran

  https://www.jeffcochrandigitalartist.com/
• 

  Filip Vandueren

  August 25, 2005 at 11:28 pm

  See if one of your three channels has less noise than any other, if so, Use only that one, for example by using the shift channels effect and then use Colorama or tint to re-introduce your duotone look.

  You can also try duplicating the layer, set the duplicated layer’s transfer mode to darken, then use a lur or median, or perhaps the best choice:

  dust & scratches:

  first set the radius as small as possible but so you get rid of all the white noise. (it’s in essence a median)
  then slowly adjust the threshold untill you start to see the noise again, for me it’s usually between 8-24%,

  for example: 16 -> now the median is only applied to pixels that differ more than 16 levels from their neighbouring pixels, so soft grain and tone variations survive but harsher specks with more contrast get medianed out.

  By using the darken mode, you make sure that black detail survives, and only white bugs gets squashed.
• 

  Munchkinpie

  August 26, 2005 at 12:17 am

  um, how do you apply gaussian blur to each channel?
  is it channel blur?

  and um, I can’t rescan it, the original image doesnt exist anymore, its from the 50s i believe

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