Resizing An Image - Making It Larger
For this tutorial, you should already know how to resize. Go ahead and open your image and resize it larger. This tutorial only works up to a certain point. I'll be posting a tutorial on how to improve the quality on larger resized images on another page.
1. After your image has been resized, go to Filter - Noise - Reduce Noise.
2. Play around with the settings until you like the outcome. Make sure preview is clicked so you can see what you're doing.
3. Try setting your settings to match mine and then move them to what works with your picture. The larger the resize is the higher the strength should be.