Is there a way to specify a range of colors for the add noise effect?

[TheKoolKid1O1]

I'm trying to use the add noise effect to randomly generate unique pixels, however i want the specify the range of colors it can randomize from, nothing too specific, just something like "0,0,0 to 200,200,200", in which it would not be able to add any colors above the rgb value of 200,200,200.

[Rick Brewster]

If you want 0-200, I think you can do it in two steps:

 

1. Run Add Noise. Might need to set saturation to max value. You should verify it's generating values across the full 0-255 range.

2. Use Adjustments -> Curves, and move the top-right node down until it reaches y=200, like this

 

[Rick Brewster]

Might also be able to do it with two layers, which would avoid the need to use Curves.

 

On the bottom layer, it should be filled with black.

The top layer, where you run Add Noise, should have its Opacity set to 200.

 

The top layer will still have values in the 0-255 range, but if you Merge Layer Down, or Flatten, you should be left with values in the 0-200 range.

[Rick Brewster]

btw, @toe_head2001, this is something that the node editor would be great for. The first node would be the PdnAddNoiseEffect, which would then pipe into an HlslBinaryOperatorEffect with Parameter1=Input, Input1=PdnAddNoiseEffect, Operator=Multiply, Parameter2=Value, Value2=Vector4Float(200.0f / 255.0f ~= 0.784313)

[Ego Eram Reputo]

Aside: Add Noise doesn't work on a transparent layer, correct?