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Thread: GIMP: How to Automate the Tedium?

  1. #11
      torstan is offline
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    I'd be interested in getting my hands on this, for just the reason Joe mentioned.
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  2. #12
      RobA is offline
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    Quote Originally Posted by jfrazierjr View Post
    Rob, I just had a thought, what if you use your top down mountain technique with the angular gradient fill, and then run this on top of the resulting height map?
    It does take a bit of futzing about.... Here is the result on the HF of the recent mountain tut I had posted.

    The lines are a bit regular... adding some random to the code would probably help.

    GIMP: How to Automate the Tedium?-test.png

    -Rob A>

  3. #13
      jfrazierjr is offline
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    Quote Originally Posted by RobA View Post
    It does take a bit of futzing about.... Here is the result on the HF of the recent mountain tut I had posted.

    The lines are a bit regular... adding some random to the code would probably help.

    Click image for larger version. 

Name:	test.png 
Views:	50 
Size:	712.4 KB 
ID:	10914

    -Rob A>
    That is THE BOMB DIGITY!!!! As you said, if you can get some randomness into the "smudge stroke"(perhaps a displace???), this would be pretty much perfect.
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  4. #14
      Karro is offline
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    Quote Originally Posted by RobA View Post
    With the script I munged up, if I start with this:
    Attachment 10911

    and do a selection to alpha then alpha to path, running the script will do this:
    Attachment 10912

    Enlarging and shrinking the selection first (to make an outside path and an inside path), then running the script first on the outside then on the inside I got something like this (after playing with spacing and such):
    Attachment 10913

    Of course, randomness lengths could be added in. Unfortunately, pdb calls won't use new settings like jitter ;(

    Let me know and I'll upload a copy if this is the effect you are looking for.

    -Rob A>

    That is pretty awesome close to what I was talking about! I wish I could pip you another green blob!
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  5. #15
      Karro is offline
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    Quote Originally Posted by jfrazierjr View Post
    Hmmmm.... with some playing with the right colors and some dodge/burn effects, this would make for a somewhat quick way to make top down(symbolic) mountains effect. With variable lengths, I expect you could make some niceish hills...
    Joe: you have been reading my mind. That is exactly what I wanted this for.

    I've been working (very, very slowly) on a worldmap with a lot of mountains... I was at this point and thought "why the crap should I do this by hand; at the rate I've been moving, it'll take me months to do all these..." So... I thought, what if it could be automated?
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  6. #16
      Karro is offline
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    Quote Originally Posted by RobA View Post
    It does take a bit of futzing about.... Here is the result on the HF of the recent mountain tut I had posted.

    The lines are a bit regular... adding some random to the code would probably help.

    Click image for larger version. 

Name:	test.png 
Views:	50 
Size:	712.4 KB 
ID:	10914

    -Rob A>
    Even if not, if I've got the outline of the mountains on a transparent layer, I can alpha to selection, then run a stroke selection or two with paintbrushes or erasers set to jitter or something to break up the lines and give it some randomnes, even if it turns out to be too difficult to add the randomness into the script itself.
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    Check out my blog: "The Undiscovered Author"
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  7. #17
      RobA is offline
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    OK, I rewrote it as a script and added a bunch of parameters.

    Start with the defaults. It shows up under the Edit menu...

    It works against a path, not a selection, so you will have to convert a selection to a path.

    The only "weirdness" about it is that path slope is not differentiated by direction. here is a sample run on a circle to show you what I mean....
    GIMP: How to Automate the Tedium?-temp.jpg

    The top half stokes "inwards" first and the bottom half strokes "outward" first.

    Depending on the pressure this might not matter, but it can be worked around by selecting inside the path (assuming it is closed) with a path to selection, running the script, then inverting the selection and running it again.

    Have fun!

    -Rob A>

  8. #18
      Karro is offline
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    Quote Originally Posted by RobA View Post
    OK, I rewrote it as a script and added a bunch of parameters.

    Start with the defaults. It shows up under the Edit menu...

    It works against a path, not a selection, so you will have to convert a selection to a path.

    The only "weirdness" about it is that path slope is not differentiated by direction. here is a sample run on a circle to show you what I mean....
    Click image for larger version. 

Name:	temp.jpg 
Views:	17 
Size:	8.9 KB 
ID:	10921

    The top half stokes "inwards" first and the bottom half strokes "outward" first.

    Depending on the pressure this might not matter, but it can be worked around by selecting inside the path (assuming it is closed) with a path to selection, running the script, then inverting the selection and running it again.

    Have fun!

    -Rob A>
    Wow. This could be cool. And I think, artistically speaking, I could imagine other uses beyond the mapping I wish to do with it - if I was inclined to be artistic with my computer.

    I already bumped you with my little rep-stick upthread. Wish I could give you more, but I'll have to spread some love first. Thanks a bunch, I think you saved me a month of work!
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    Cogito, ergo sum nerdem.

    Check out my blog: "The Undiscovered Author"
    It's the story of a writer... follow me in my simple quest to get published, and share your own writing stories, adventures and writerly tips.

    Pimping my worldmap here. Still WIP... long way to go, but I'm pretty proud of what I've done so far...

  9. #19
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    Great stuff as usual RobA!
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  10. #20
      RobA is offline
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    Never able to leave "well enough" alone...

    I've updated the script so it converts the path to a selection and tries to figure out "inside". If there are unclosed path segments, the endpoints are joined and that is "inside". If the path segment is perfectly straight and the software uses "down" as "inside". The script won't check that your stroke length stays inside... you will have to worry about that yourself

    Here are the modes now offered (the faint red circles were added after to show the path location):
    GIMP: How to Automate the Tedium?-perpendicular_smudge_sample.png

    And attached is the updated script.

    ..And if someone can provide the scheme code to turn a 4 value array: (cons-array 4 'double) where it holds X1 Y1 X2 Y2 into a larger array with jittered intermediate points, i.e. X1 Y1 Xa Ya Xb Yb ... Xz Yz X2 Y2 then the strokes could jitter...

    -Rob A>
    Attached Files Attached Files

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