A few years ago, I did all the necessary math to build a chart for resizing images to fit the screen precisely. Cropping images or creating original ones to fill the screen without ProShow dictating what gets lost is now a piece of cake. Since the chart is handwritten on 3 cardboard pages–both front and back totaling 148 combinations–I can’t give you a file to download, but below are some typical numbers you might find useful. You read it as, “If the width is this, then the height needs to be that for 4:3 (or 16:9).” I use the chart both ways depending on whether I need to retain the width or the height of an image since nobody wants to cut off the top of Rover’s head.
Width 4:3 Height 9:16 Height
800 600 450
960 720 540
1024 768 576
1184 888 666
1200 900 675
1280 960 720
1344 1008 756
1440 1080 810
1552 1164 873
1600 1200 900
1792 1344 1008
2000 1500 1125
My favorites? 1552 x 1164 for standard screen, and 1792 x 1008 for widescreen.