You can see how corrupted that picture at below. You can seperate these part and fix. But if you find out a more easy way. This was is different Noice/Despeckle features.
1 – Think about this image (png, jpg ,,,etc) I mean it is not psd.
2- Open it in photoshop > Filter Noise Median… yes our solution is “Median…”
3 – You try Radius value between 2 – 9 . It is depend on your image situation.
4 – I tried 5 and this is it.
If you have any suggestions or questions,requests please leave a . Thank you.