How work this Blend Mode Mathematically ?

hi,
i need to know how work this Blend Mode :
Layer, Overlay, Hard light, Add, Subtract, Difference,
Invert, Alpha & Erase . Mathematically ?
Regards
Crimson

AlMostabed wrote:
> this like help u :
>
http://dunnbypaul.net/blends
>
> one more question mid-grey in RGB is (128 , 128 , 128 ).
how i know
> if the base color less or greater than mid-grey ??
>
> i know DARKER than mid grey will be less than 128 &
LIGHTER than mid
> grey will be higher than 128 but in each channels or
what ?
>
> ok, ( 129 , 239 , 129 ) is lighter than mid grey and (
127 , 101 ,
> 123 ) is darker than med grey . right ? and ( 235 , 128
, 107 ) is
> darker or lighter then mid gray ??
You need the L component of the HSL representation of your
colour.
http://en.wikipedia.org/wiki/HSL_color_space
L=0.5*(Math.min(Math.min(r, g), b)+Math.max(Math.max(r, g),
b))
where r, g, and b are the components of the colour.
Andrew

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