Topaz DeNoise not having any effect on image?

[frankg]

ver 3.1.2

I have an iPhone image (copy attached) and if viewed at 100% you see that it is full of noise & artifacts. I have tried all the DeNoise modules at various numbers & at full strength but none smooth out the noise. (I dont need detail as it's a shadow against a flat untextured wall. ). Can you suggest the best way to get a smooth noise free result?
IMG_4224 copy.jpg

[frankg]

I can’t see how to delete my original post?? I could remove the image. The issue has been resolved on another forum. Please ignore this post