black and white filter in material

[barbrian0723]

hi

not sure what it is called and if i did i probably did not need this post
want to filter or multiply stuff within a material like a color or texture so that no color value is black and any color value is white

thanks

[AlienRenders]

No color? As in transparent? Just use a lerp node on the alpha of your color. First pin is black. Second is white.

[barbrian0723]

bit new to materials
so far managed to avoid them
but now i really need a dynamic material for something

should not be transparent

can say i must take greyscale to black and white in some sense

in logic it would be if color or r,g,b is below x, it is black and if above x it is white

thanks

[AlienRenders]

Depends how you want to calculate the brightness. For now, we’ll assume you just average them. You can change the Threshold as you see fit.

[barbrian0723]

this is great thanks
spent a lot of time looking and could not source this

i think i need the material to be entirely opaque in the end
not sure whether that is the only factor determining brightness but it seems to be a dominant one

thanks again

[AlienRenders]

I meant intensity of the color. How do you want to calculate the single value from RGB?

Normally, brightness is calculated with this:

0.299 * Red + 0.587 * Green + 0.114 * Blue

Above, I used:
0.333 * Red + 0.333 * Green + 0.333 * Blue

Then there’s alpha. You mentioned it was opaque. If it’s not opaque, you have to decide what to do with alpha.

[barbrian0723]

with you, thanks