Method Image.Image()->distancesq()

Method distancesq

object distancesq()
object distancesq(int r, int g, int b)

Description

Makes an grey-scale image, for alpha-channel use.

The given value (or current color) are used for coordinates in the color cube. Each resulting pixel is the distance from this point to the source pixel color, in the color cube, squared, rightshifted 8 steps:

p = pixel color
o = given color
d = destination pixel
d.red=d.blue=d.green=
    ((o.red-p.red)²+(o.green-p.green)²+(o.blue-p.blue)²)>>8

original	distance² to cyan	...to purple	...to yellow

Parameter r

Parameter g

Parameter b

red, green, blue coordinates

Returns

the new image object

See also

select_from