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Thread: Making water with soft edge in Gimp

  1. #11
      Vandy is offline
    Guild Journeyer Vandy's Avatar
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    Tutorial Tutorial available as a PDF document

    Hello, joćo paulo.

    This will be a quite useful tutorial for creating water in GIMP. Thank you for writing it and sharing it.


    TO ALL:

    I have created a PDF document of this tutorial and have attached it to this message.

    Enjoy.

    Regards,

    Gary

    Making water with soft edge in Gimp-making-water-gimp-soft-edge.pdf
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  2. #12
    Guild Adept joćo paulo's Avatar
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    Thanks for the PDF version and the words Vandy




    Last edited by joćo paulo; 03-30-2009 at 09:17 AM.
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  3. #13
      Ascension is offline
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    Thanks Vandy, our resident scribe. I always like to download something and work on it with the browser closed.
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  4. #14
      RobA is offline
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    Post Posterize Indexed Gimp Script

    One suggestion on the posterization technique.

    Gimp's posterize "is designed to intelligently weigh the pixel colors of the selection or active layer and reduce the number of colors while maintaining a semblance of the original image characteristics" (from the gimp docs).

    What is not explicitly mentioned is that each channel of the image is separately analyzed. This means for a posterize setting of 3, you will end up with 3 levels each of R, G, and B, or 27 colours.

    This works nicely for some images:
    Making water with soft edge in Gimp-colour_wheel.pngMaking water with soft edge in Gimp-colour_wheel-poster.png

    But not so well for single colour gradients (like the blur in this tutorial creates) that are not pure R, G, or B

    I found a tutorial on the web that described using an index mode conversion to create a different posterized version of an image. Attached is a script that implements this (Shows up under colours->Posterize Indexed...). Note that the slider here is the number of colours, not channel levels, so a comparable setting to posterize level 3 would be 27 colours.

    Here is a typical gradient, posterized and with my posterize indexed script:
    Making water with soft edge in Gimp-grad1_all.png

    But it really depends on the source image, as this might not be what you expect from the colourwheel using poster indexed (to 27 colours):
    Making water with soft edge in Gimp-colour_wheel-poster-indexed.png

    -Rob A>
    Attached Files Attached Files

  5. #15
    Guild Adept joćo paulo's Avatar
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    Thanks for the improvements and the very useful script rob.
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