Extending Image Overlays

Option #1

Revolution Slider includes a dotted image overlay by default:
If you wanted, you could replace the png image files that are used for these repeated overlay patterns. Image locations shown in screenshot to the right.

Option #2

Add one of the following Custom CSS blocks to the slider's Custom CSS section, and adjust the "background" property.

Best for when your individual slides have captions:

Best for when your individual slides do not have captions:

Option #3

Inside Photoshop, add a solid colored layer on top of the original image, give it a transparency value, and save the image.