CODEWITHSUNDEEP
imagemagickimagemagick-convert
Tobias P.
Tobias P.

Reputation: 4664

Remove the noise from ImageMagick transformation pipeline

I am trying to "simplify" an image with ImageMagick by converting it to gray-scale and using an oil paint filter group larger parts that seem to be equal, e.g. clouds, grassland...

My source image for the example is:

Source image for the example (from tmdb: http://www.themoviedb.org/movie/122-the-lord-of-the-rings-the-return-of-the-king)

When using IrfanView for Windows, I do the following steps:

This is the resulting image (replaced lower color with floodfill, perfect!): Resulting image

It's exactly how I want it (maybe some parameters need tuning). When I try to make the same result with ImageMagick, I hacked this:

convert -monitor lotr2.jpg +dither -quantize gray -colors 8 \
        -paint 6 lotr_oilpaint.jpg

But no matter what I am trying, there is a really awful amount of noise in the image. I tried the mode filter and it helped a little bit by removing some noise but it seems to add some noise in other parts.

It's far away from the IrfanView solution, generating really solid areas of the same color which can be flood filled with no problem.

Upvotes: 2

Views: 866

Answers (1)

Kurt Pfeifle
Kurt Pfeifle

Reputation: 90263

Had a quick shot at your challenge... this is the first command I tried:

convert                               \
   https://i.sstatic.net/6iX53.jpg \
  -colorspace gray                    \
  -colors 16                          \
  -paint 8                            \
   6iX53.png

As you can see, I skipped the -floodfill +X+Y red parameter for now...

Here is my result:

Result

It looks already rather close to yours. It contains 10 different colors:

identify -format '%k\n' 6iX53.png

 10

To successfully do a -floodfill when there is some 'noise' in the image, you can add a -fuzz X%-factor to the command. So let's try that with -fuzz 3%:

convert                               \
   https://i.sstatic.net/6iX53.jpg \
  -colorspace gray                    \
  -colors 16                          \
  -paint 8                            \
  -fuzz 3%                            \
  -fill red                           \
  -floodfill +1+438 '#030303'         \
   6iX53-floodfilled.png

Result:

2nd Result

Maybe by playing with some of the parameters I used, you can get the result closer to what you want...

Upvotes: 3

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