I have been reluctant to publish the image in my previous post, Heidelberg Castle at Night. It is a single frame taken without a tripod at ISO 5000. It has a fair amount of noise and does not appear very sharp. The latest instalment of DxO PhotLab added an improved version of the PRIME denoising algorithm called DeepPRIME. I decided to see what it can do to this picture.
Enabling DeepPRIME and bumping Luminance up to 90 eliminates the noise completely, but the image appears slightly blurred. A lower value would have been enough for most of the picture, but 90 gives a better transition between the hill and the sky. To bring back some of the detail, I increased Lens Sharpening Global to 1.8.
The image above shows zoomed-in examples of the different steps, and below is the full edited image.