Photodex is not exactly forthcoming about some of the inner workings of its star Programs Gold and Producer. They normalize your imported graphics and images to the slide defined upon import. However, if you want and need specific information about your layer, you have to figure it out on your own. Generally, this involves figuring out how tall or wide the layer is for a specific size. But, to make effective use of rotation center, you generally must do some math. From ProShow v4 through v6, Photodex has only provided a layer-centric rotation center feature. Therefore, if you want to rotate/tilt your layer around a specific spot on the screen, you have no choice but to do some calculations figure out where that spot is relative to your layer’s center. If you have no idea how ProShow does what it does or even where the rotation center values come from, you are simply out of luck.

For the more adventurous, curious, or simply masochistic users however, some people have figured out some of ProShow’s mysteries. I figured them all out and finally decided to write the darned equations down . . . maybe you will find them as useful as I have.

I have derived the following ProShow equations. You might find them useful. These equations deal with Pan, Zoom, Rotation Center, Width, and Height in all ProShow Scales. Note that Stretch to Frame effectively converts the layer’s height and width to the screen aspect (and so is not directly referenced). Enjoy … and, Good Luck!

Update
Fixed minor errors with Safe Zone Equations. Adjusted all equations to use a decimal number representation of the Zoom percent value rather than the decimal value of zoom. Therefore, a zoom of 60% is represented as 60 for the value of Z instead of 0.60. This should make it easier to use and understand the equations. This also improves the consistency in how numbers are represented in the equations. Finally, simplified the presentation of the equations.