Optix denoiser and real world RGB image

[droettger]

You mean you have 8 bit greyscale images vs. 24 bit RGB color images?
There is no difference for the denoiser invocation. Either needs to be remapped to half or float RGB(A) formats anyway to run the denoiser.

However when I use a 24bit RGB image the resulting image has got almost no difference.

You mean no difference between the noisy and the denoised image?
Do you set the OptixDenoiserParams::blendFactor to 0.0 to show the fully denoised image?

If that is all the data you have (no noise free albedo, no camera space normals) then there is nothing else to do.

Related topic:

Denoiser and thin lens cameras

Pre-processing on the noise before the OptiX denoiser is applied will not produce better results. It is not trained with any smoothed images. It requires the original noise. It’s also not going to work very nicely with very few samples because there is often not enough information present inside the input image. It’s also not guaranteed that adding albedo or albedo+normal buffers will always result in a better image. Means simply keep providing the original noisy RGB image. The more samples t…