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what blend modes do noise filters use?

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jdg1978
Posts: 4
If I specify an image as input to a noise filter, e.g., Perlin Noise, which blend mode does it use to blend the generated noise with the input image? Looks close to a screen blend, but I'm wondering if this is documented anywhere?

Thanks!
Posted: March 28, 2016 12:01 pm   Details E-Mail
Indigo Ray
Adam

Posts: 1442
Filters: 82
Welcome!

Filter Forge has help pages on each component. You can access the help page directly by entering the filter editor, selecting the Perlin Noise component, and clicking the Help link on the bottom left.

The noise components do not use a screen blend. I believe it's a normal blend. Keep in mind you can use an image as either the foreground or background input (or any combination of green inputs).
Posted: March 28, 2016 6:15 pm   Details E-Mail
jdg1978
Posts: 4
Thank you! I had read the documentation (for the Perlin Noise filter) but it didn't specify the blend mode. Appreciate your reply.
Posted: March 29, 2016 12:16 pm   Details E-Mail
jdg1978
Posts: 4
So, just practicing this in Photoshop I notice that I get something much closer to what I'm seeing in FF when I use the Screen blend mode as opposed to Normal (which only works if I reduce transparency, obviously!).
Posted: March 29, 2016 1:45 pm   Details E-Mail
ThreeDee
Lost in Space

Posts: 1672
Filters: 112
I'm pretty sure it is Normal. The result depends on what the other (background) color is that it is blended with, as well as the contrast setting.

If it was anything but Normal or Linear (lerp), putting the same image in Source and Background would result in something that looked different from the original image.
Posted: March 29, 2016 2:24 pm   Details E-Mail
jdg1978
Posts: 4
Ah, I don't think I've provided enough context. I'm only using the Noise input (and the input is just an RGB image). I'm not specifying anything for Background. I'm really just trying to understand how the generated noise is applied to the input image.
Posted: March 29, 2016 2:42 pm   Details E-Mail

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