Filter Forge - Sorting a Gradient using table.sort(t,comp)

xirja

xirja.com

Posts: 198
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Trying to sort a gradient based on perceptual brightness and then selecting the darkest color.

The script included in the attachment does not give the expected result. Getting values from
the associative table doesn't seem to be working properly, as dark blue should be the result.

Most likely there is a problem with getting values from the table after the sort. a nil issue?

Any other ideas on how to use perceptual(Lab L) values to sort/reorder colors?

???

GradientTestDark.ffxml

Posted: January 3, 2012 10:03 am

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Sphinx.

Filter Optimizer

Posts: 1344
Filters: 38

try this replacement:

Code
function get_sample(x, y) local c = {} for i = 1, 4 do c[i] = {} c[i].li = get_sample_grayscale(x, y, _G["I"..i]) c[i].r,c[i].g,c[i].b,c[i].a = get_sample_map(x, y, _G["C"..i]) end; local function compare(a,b) return (a.li < b.li) end table.sort(c, compare) return c[1].r, c[1].g, c[1].b, c[1].a end;

Njyldgarkn sample cache!

Posted: January 11, 2012 10:29 am

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xirja

xirja.com

Posts: 198
Filters: 1

Oh great, that _G["I"..i ] for multiple inputs! Thank you! It works, and much more elegantly than my baseball glove hands approach. smile:D