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I am using Inkscape for vector and Gimp for raster graphics. They are quite powerful though open-source.

Can somebody recommend me if there is open-source software like Inkscape or Gimp or maybe a tool inside mentioned ones that can calculate 75% darker color of a given color?
Well 75% is not a requirement, it can be for example 50% or 42%, whatever. Also could I do the same thing for 75% lighter color or 64% lighter color.

I am building a software and so far I relied on my coded function to calculate given value. But I need to test this function. I need a proof from outside world that this function is calculating the correct value.

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You can do this yourself with a calculator and the HSB value of any colour.

HSB = Hue, Saturation and Brightness.

Take the existing brightness value, and add or subtract whatever percentage amount you need, and enter that. Bingo!

  • Sounds promising! Will try it :) – Vlad Sep 21 '16 at 19:39
  • Any ideas where can I find HSB in Gimp or Inkscape? – Vlad Sep 22 '16 at 15:31
  • Search google for Gimp (or Inkscape) and HSB or HSL, they're the same thing, and I can't imaging they're not part of these apps. – Confused Sep 22 '16 at 15:54
  • If they're not in these apps, there's bound to be online convertors for any colour format to and fro from HSB/HSL – Confused Sep 22 '16 at 15:54
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W3schools has a colors picker tool and it has a few different options to modify a colour including the one you are asking for. Here is the link: http://www.w3schools.com/colors/colors_picker.asp

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