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Thread: [Award Winner] Making Not so Random Coastlines in GIMP - alternative method

  1. #1
    Administrator RobA's Avatar
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    Tutorial [Award Winner] Making Not so Random Coastlines in GIMP - alternative method

    I just posted this tutorial on making coastlines based on pre-defined shapes.

    Two things I don't like are the slight blurriness in the coastline, and the inability to play with the effective water-level (like you can do with the threshold method).

    SO to this end, I came up with a variation on the threshold level as an alternative to my other not-so random coastline tutorial, this time with clever use of multiplying levels, rather than differencing levels.

    Here is the "Not So Random Coastline Tutorial - alternative method"

    NOTE: There is a description by Juggernaut1981 on creating multiple islands an still maintaining detail that gets inserted after step 7. Jump over there for the details!
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    Last edited by RobA; 04-27-2010 at 02:32 PM.

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    Community Leader RPMiller's Avatar
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    You do realize that if you keep this up, I'm going to be in rep debt to you don't you?

    Good stuff! I have to spread some rep around before hitting you again, but I will. Perhaps someone else can rep you for me?
    Bill Stickers is innocent! It isn't Bill's fault that he was hanging out in the wrong place.

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    Administrator RobA's Avatar
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    One more addition...

    If you pick the "Turbulent" option in the cloud noise, this will have the effect of chopping up the shape much more. I used that to create an Atoll (attached) that shows the original white shape (outlined in yellow) and the resultant random coastline.

    -Rob A>
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    Community Leader Gracious Donor ravells's Avatar
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    Rob this is brilliant! The ability to have the coastlines made for you while you do the general shapes is invaluable. It's a like having a very controlled fractallisation command.

    Rep? You can have my eye teeth!

    Ravs

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    Administrator RobA's Avatar
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    Gee Thanks! I just hope people find the techniques useful. I'd like to see what others end up doing with it!

    -Rob A>

    (p.s. what...no blush smiley?)

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    Community Leader pyrandon's Avatar
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    Wow--amazing. And although written for GIMP, I can so yoink this for Phosotshop as well. Great great great. Repped!
    Don
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    Community Leader Gracious Donor ravells's Avatar
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    I tried this tutorial using Paintshop Pro last night and it worked like a charm. I'm going to try it again, but using different fills apart from noise to see if anything useful turns up. Thanks for the tut, Rob - very handy indeed.

    Ravs

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    Administrator RobA's Avatar
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    Good to see it can be applied in other software. (I used PSP back at version 4, but that was a while ago )

    One other bit is to play with the curves dialog before blending the images. That will let you do things like the attached - and island ringed by a reef. (FYI - I just started with a blurry blob but used the curves adjustment to make the "ring" appear. I can grab the curves dialog if anyone wants, to show what I mean...)

    -Rob A>
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    Community Leader RPMiller's Avatar
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    This is just rockin'!!
    Bill Stickers is innocent! It isn't Bill's fault that he was hanging out in the wrong place.

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    Community Leader pyrandon's Avatar
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    Quote Originally Posted by RobA View Post
    (FYI - I just started with a blurry blob but used the curves adjustment to make the "ring" appear. I can grab the curves dialog if anyone wants, to show what I mean...)
    Would you mind? That would be really helpful.
    Don
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