Country, I was taught that the Opacity is how hard the pen would be pushing on a paper if we were coloring, and the fill was the amount of ink that you wanted to use. Simple for me to remember. Here is an article I found to help with what they do and their differences. Gary http://www.photoshopessentials.com/basics/layers/opacity-vs-fill/
Country's Mama wrote:
In photoshop in the Layer adjustments what is the difference between opacity and fill. To my untrained eye they seem to do about the same thing.
Country, I was taught that the Opacity is how hard the pen would be pushing on a paper if we were coloring, and the fill was the amount of ink that you wanted to use. Simple for me to remember. Here is an article I found to help with what they do and their differences. Gary http://www.photoshopessentials.com/basics/layers/opacity-vs-fill/