把黑色改变为别的颜色

因为黑色的RGB是(0,0,0)，所以要反色下才能改

如果要改白色就不用反了

b = Bitmap.new "E:/zh99998/Documents/Tencent Files/276169442/FileRecv/1.png"

b.width.times do |x|

  b.height.times do |y|

    color = b.get_pixel(x, y) 

    color.red = 255 - color.red

    color.green = 255 - color.green

    color.blue = 255 - color.blue

#================

    color.red *= 0.5

    

#================

    color.red = 255 - color.red

    color.green = 255 - color.green

    color.blue = 255 - color.blue

    b.set_pixel(x, y, color) 

  end

end

s = Sprite.new

s.bitmap = b

Graphics.wait 100