Problem with a Noise Layer in PS

[Jean Louis_MAILLARD4838]

Hello Adobe Community. I have a problem with a noise layer.

I am working on Photoshop to reproduce a lith effect on my pictures.

In order to have noise , I created a gray layer, then added noise with the "Add noise" filter. The layer is in "Linear light" blending mode.

At the end, when I flatten the image, the result is a picture where noise is very present and the photography appears very faded behind ?????

See below the result with and without a noise layer.

I work with the latest version of PS v26.10

A big thank to anyone who can provide me with an explanation for this strange behavior.

[Stephen Marsh]

Noise has too be evaluated at 100% view (1:1), where 1 image pixel = 1 monitor pixel.

i generally use overlay or soft light blend modes for "smart nose" - I'd need to test.

I use actions for this::

https://www.dropbox.com/s/5rmz0b6c7a40h7y/Smart%20Noise%20CS3.atn

[D Fosse]

Whenever something seems to change when merging layers, it's because you are not viewing at 100%. The merged result is correct. The preview is misleading and incorrect.

100% has nothing to do with size. It means one image pixel is represented by exactly one physical screen pixel.

For performance reasons, all blending and adjustment previews are calculated on the on-screen version of the image. When you are zoomed out, that means a resampled and softened version of the image. Pixel levels are averaged out. You get a lot of intermediate values that aren't there in the full original data.

When you merge, commit an adjustment etc, the numbers are re-calculated on the full original data, pixel for pixel.

Viewing at 100% avoids all this and renders the whole issue moot. You see every pixel before and after, and so nothing changes.