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

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xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
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
_____________________________________________________

http://web.archive.org/web/2021062908...rjadesign/
_____________________________________________________
Posted: January 3, 2012 10:03 am   Details E-Mail
Sphinx.
Filter Optimizer

Posts: 1750
Filters: 39
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 init/prepare process x no. of render blocks x no. of passes
Posted: January 11, 2012 10:29 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
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

If there was a more general case of sorting a spectrum using OUTPUT_WIDTH though?

SpectrumTestCode.ffxml
_____________________________________________________

http://web.archive.org/web/2021062908...rjadesign/
_____________________________________________________
Posted: January 13, 2012 7:30 am   Details E-Mail

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