Re: Randomized gradient

> I followed Greg's suggestion too: use Filter -> Render -> Clouds -> 
> Plasma then take a 1-pixel strip and resize till it fills the entire 
> image. After looking at how the Gimp-Gradients tool works I realized 
> that I couldn't see any way to take this strip and turn it into a 
> gradient (so it could be applied to arbitrary images) with support for 
> the options that gradient tools supports - select a Mode, Opacity,
Shape 
> and Repeat, Dithering-ON/OFF, Adaptive Supersampling-ON/OFF.
> 
> The first two (Mode+Opacity) can be handled by creating a layer 
> containing the resized 1=pixel strip but I can't see any way to handle 
> the remaining ones?
> 
> Looking at a GGR file it appears to be just a text file with a variable 
> number of lines of info.
> eg. here are the contents of Abstract_1.ggr
> It contains 13 columns of info per entry and appears to be suitable for 
> manipulation in a spreadsheet etc. if I knew what the contents of each 
> column are supposed to represent.
> 
>     * GIMP Gradient
>     * Name: Abstract 1
>     * 6
>     * 0.000000 0.286311 0.572621 0.269543 0.259267 1.000000 1.000000
>       0.215635 0.407414 0.984953 1.000000 0 0
>     * 0.572621 0.657763 0.716194 0.215635 0.407414 0.984953 1.000000
>       0.040368 0.833333 0.619375 1.000000 0 0
>     * 0.716194 0.734558 0.749583 0.040368 0.833333 0.619375 1.000000
>       0.680490 0.355264 0.977430 1.000000 0 0
>     * 0.749583 0.784641 0.824708 0.680490 0.355264 0.977430 1.000000
>       0.553909 0.351853 0.977430 1.000000 0 0
>     * 0.824708 0.853088 0.876461 0.553909 0.351853 0.977430 1.000000
>       1.000000 0.000000 1.000000 1.000000 0 0
>     * 0.876461 0.943172 1.000000 1.000000 0.000000 1.000000 1.000000
>       1.000000 1.000000 0.000000 1.000000 0 0
> 
> 
> Can any one point to documentation somewhere?
> Later ... Goggle is my friend <GRIN> searching for: gimp+ggr+format 
> turns up (as #1 hit of 21,300) this blog entry: 
> http://raikardesigns.blogspot.com/ which has a link to this
explanation: 
> http://rockraikar.googlepages.com/gimpGGRformat.txt :
> 
>     * GIMP Gradient
>     * Name: My Grad
>     * 2
>     * 0.000000 0.250000 0.500000 1.000000 0.000000 0.000000 1.000000
>       0.000000 1.000000 0.000000 1.000000 3 0 0 0
>     * 0.500000 0.750000 1.000000 0.000000 1.000000 0.000000 1.000000
>       0.000000 0.000000 1.000000 1.000000 4 0 0 0
>     * ------------------------------------------------------
>     * First line says it is a gimp gradient file.
>     * Second line gives your Gradient a suitable name.
>     * Third line tells the number of segments in the gradient.
>     * Each line following defines the property of each segment in
>       following order.
>     *  1. [position of left stoppoint]
>     *  2. [pos. of middle point]
>     *  3. [pos. of right stoppoint]
>     *  4. [R for left stoppoint]
>     *  5. [G for left stoppoint]
>     *  6. [B for left stoppoint]
>     *  7. [R for right stoppoint]
>     *  8. [G for right stoppoint]
>     *  9. [B for right stoppoint]
>     * 10. [Blending function constant]
>     * 11. [Blending function  constant]
>     * 12. [Blending function constant]
>     * 13. [Blending function constant]
> 
> So it looks to create a "Random" gradient all you have to do is choose 
> for each line values for 1,2,3 so that line-1-column-1 is 0.0, 
> line-last-column-3 is 1.0 with the values columns 1,2,3 increasing in 
> each line.
> 
> Then choose random values for colors in columns 4-9 and blending 
> function columns 10-13.
> For a complicated one (46 lines) look at "Flare Glow Angular 1"
> Comparing data shown in text editor with values shown in the Gimp 
> Gradient editor it appears to me that the names for columns 7-9 above 
> are incorrect (s/b HSV values(?)). Two of the "Blending function 
> constants" are probably Luminance and Opacity. That leaves the two 
> integers (12-13) unexplained. Most GGR files have values 0,0 though I 
> spotted some with small integer values between 1 and 5.
> 
> Ken - does that give you enough to make a start? Please post back with 
> any results etc. (I haven't tried to create any yet myself but will 
> attempt it "real soon now"). If I knew how to use script-fu it also 
> sounds like a "natural" for it.
> 
> (Will be Reposting to Flickr-Gimp Users group.)
> 
> Regards ... Alec -- buralex-gmail
> -- 
> 
> 
> 
> [Non-text portions of this message have been removed]
>

This looks promising, but I will need to look it over some more.
I don't know what "Blending function constant" means, and alpha has to
be in there somewhere too.

But this is a start, and it is more than I knew before.
--Ken

 


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