Greyscaling an image?

[Ellie]

Heya, I'm scripting a skill casting system that shows icons for each skill. I want, any time a skill is disabled, for the icon to show up as greyscale. Now I could do this in Fireworks myself, but then I'd have hundreds of needless icons. I wondered if there's already a method in RGSS to greyscale images?

 

[Dargor]

If your icons are RPG::Sprites, you can use the tone attribute and set it to whatever you want, exactly like the screen tone, using the Tone object (Tone.new(reg, green, blue, grey))
If your icons are Bitmaps, then there is no built-in function that let you change its tone. However, I think Link T and/or Seph and/or Trickster did something like that a while back. Take a look at MACL2.0+, I'm sure you can find something in there!

 

[S S Muu]

it's actually pretty easy.

for x in 0...bitmap.width
  for y in 0...bitmap.height
    color = bitmap.get_pixel(x, y)
    luma = color.red * 0.3 + color.green * 0.59 + color.blue * 0.11
    bitmap.set_pixel(x, y, Color.new(luma, luma, luma))
  end
end

hope it helps.  :thumb: