Can you make low resolution or low quality images look better for printing?
The short answer is no. In some instances, we can reach into our bag of tricks and make it better, but it will never be as good as a great quality original image.
We recommend that you retain your image quality from the start. Once an image is saved at a lower resolution or in a reduced quality format, the detail that is lost in that conversion cannot be recovered—even if you try to resave later at a higher resolution.
Always supply your artwork at full resolution for best results.