want to match the Redshift window to match the Redshift window

[Mark]

I am working with someone who really likes the look of the noise in the RedShift window with low quality render. but when I output the image it is clean. it is like there is noise reduction being added but It is off in the redshift settings. Below are the same frame, the Redshift window fully rendered, and the picture viewer output.
I know I can add noise with a plugin but it does not look anything like the noise I get here.
Dr Sassi, do you know how I can get the look of the Redshift window in my output render?

Thanks!

[Dr. Sassi]

Hi Mark,

Can you share a project file with the noise you like, just one object, and the lights you used (if HDRI, please use one from the Asset Browser)? My hope is that the file will be below 1MB and can be attached here as a c4d file.
(Dropbox, Google, Wetransfer, Apple, or Adobe as cloud services are fine, but other options are excluded based on security concerns. There are no exceptions – Sorry. Please no tiny URLs)

The noise can have different reasons, which means it can occur in some areas and not in others. Setting the Render Settings to Progressive and only one pass (or a few) and the Threshold to 0.1 or even 1.0 might do the trick, but as long as I don't know what part produces the noise, it is hard to say.

My suggestion, as it might get tricky to keep this level of noise (continuity), is to enable the RedShift Render> Red Giant Looks, in the RS Render View, the post render options (cogwheel) post effect and set up from "Tools" a noise instance, preferably Monochrome. This will setup automatically for the Picture Viewer render, so there will be no extra work.

If I get a file, I will look into it in the morning. (Pacific Time here).

Cheers

[Mark]

Thanks, Yes setting "Final Rendering" to progressive did most of it but I am still getting some sections without the noise but it is now the same in the Viewer and the output. I will try to figure it out and will possibly make a project to upload here.

Thanks

[Dr. Sassi]

Hi Mark,

What you need to do is exactly the opposite of what most (?) artists do. Typically, any training that moves a little bit above the beginner level showcases what refinements are needed to get short render settings and noise-free results.
Producing noise artifacts randomly is possible, but evenly and with continuity: I'm unaware of that based on changing scene and render settings.

The influences are not trivial, and mastering to avoid noise is easier than producing an even noise, yet a noise that allows for continuity. This is (again) not trivial, so I suggested going for a clean result and a post-production treatment. The reason for the noise might change even with camera moves or if a character moves through the images, blocking a light source. There is no stability, and I doubt that you will find any training about it. Noise is normally only good on insufficient screens, as it merges noise to a pseudo-grain (Use the noise filter in Photoshop then use a Gaussian Filter to see what I mean.

This file is set up for this demo, all settings are not suggested at all for any production use.
Cv4_2025_drs_25_RSno_01.c4d

I have introduced the reflections to showcase the problem and save you some time. How to get noise evenly on top of that while keeping the balance between shadow and height areas is beyond me.

Anyway, here is another project file, connect the texture or any of your test images to the plane. Then, switch between the render settings. The HDRI should load from the Asset Browser; look here for the upper right corner of the image. How is the noise not there? With the RedGiant noise option, it is.

I have concerns even supporting this exploration, as it is impossible to produce an even noise, as it is missing information in some specific areas that lead to the rendered noise. I do not see a good service to you to encourage this path. Especially as things might change with the next update, and you have to start over with the search to create an even problem.

From a colorist point of view, having noise in the image creates the next problem, as the gamut of color noise is all over the place. Typical color grading (secondary) with masks/mattes or just power windows will change the noise locally anyway, and all the effort to maybe get some even noise produced is taken away. In my received training (Color Academy for Professional Colorists, in Hollywood, the noise was always taken out before. If Grain was wanted, it was placed on top of it, if at all).

All the best

P.S.: some areas to set up artifacts -- or noise free results
https://help.maxon.net/r3d/cinema/en-us/Default.htm#html/Optimizations.html?TocPath=Redshift%2520Render%2520Options%257CRender%2520Settings%2520-%2520Production%2520-%2520Advanced%257COptimization%2520-%2520Production%257C_____1

[Mark]

Thanks, Dr Sassi!

This helps a lot. I have a better understanding now of what we are seeing. I think we can get the look we want with your information and add noise to the sections that are not generating noise.

[Dr. Sassi]

You're very welcome, Mark.

The RedGiant Noise was added after noise reduction for a more even distribution.

Stress test this with heavy filters* and strong color grading, going from large color spaces into small ones, since there is no 100% conversion from one into the other.

*(Think of Post-FX DOF/Bokeh and the logic of Noise when applied.)

Enjoy you project