Modifiers were first introduced in ProShow Producer v4. Photodex has yet to improve them as of v8. It has been left up to the so-called “expert” ProShow user to figure out how to use them. One of the modifiers deals with a layer’s zoom setting. This modifier alters a layer’s zoom based on the layer’s existing zoom setting. It is entered as a constant value on the layer’s zoom setting.
A cursory review reveals that this constant value represents the percent of change of the layer’s existing zoom setting that is added to the layer’s zoom setting. So, if the layer has a zoom of 100 and a constant value modifier of 10 is assigned to the layer, when the layer is played, the layer will display as 110. If the modifier was -10, the layer would display as 90.
I’ve been using modifiers for years. I do not, however, use zoom modifiers all that often. But, too, I’ve only been making cursory changes using them. My main use has, in the past, been to periodically apply the modifiers to a layer to create appearance of an outline for another layer. These have been related to small changes in size.
I developed a tool in my TOOLS FOR PROSHOW that is used to define size changes to a layer to allow it to work as an outline or frame to another layer. It defines the size changes necessary in terms of zoom settings, zoom settings and modifier values, or a dimensioned layer of a specific and size. But, it was limited in utility to the specific task of frames or outlines. I wanted something that gave me more latitude. So, I created a tool, MODIFIER ZOOM that would help me create a modifier for zoom.
When creating a zoom modifier there are three attributes that are dealt with: a layer’s starting zoom, the final zoom value, and the modifier itself. But, knowing any two of these three values lets you calculate the missing value. Sometimes you want to know what value of modifier is required for a given setting of zoom that provides a desired zoom setting. But, likewise, you may know what the layer’s zoom setting and what its zoom modifier are. What you want to know then, is what the final zoom setting will result from that pair. Other times, you may want to know what the required starting value of zoom is for a given end zoom value and a specific modifier. So, that’s how I built the tool. Choose whether you want to know the start zoom, end zoom, or modifier … the tool will then ask for the values it needs to calculate the values being sought.
The tool was built on the idea that the modifier created a proportional change in the zoom of that layer. What I discovered, however, was that Photodex didn’t build the modifier zoom function that way. In the process of testing the tool, I discovered that the layer’s zoom settings were cross-related. The starting zoom value of one axis had an effect upon the modifier calculation of the other axis.
Equation 1. X-Axis Modifier
Equation 2. Y-Axis Modifier
Where Xe and Ye are the End value of Zoom for the X and Y axis respectively. Xs and Ys represents the initial (or Start) value of zoom for the X and Y axis respectively. Finally, Mx and My are the Modifier values for each axis (X and Y axis respectively). That’s all there is too it. However, note that while the percent change from the starting zoom has been understood for some time no, the idea that the other axis could affect the actual modifier value for current axis was unknown. Photodex has NOT documented any information about modifiers. This particular quirk of zoom modifiers was a big surprise.
Advanced Introduction to Modifier Zoom
Adding A Zoom Modifier to a ProShow Layer
© Copyright 2016, Dale L Fenimore, FPVP LLC, All Rights Reserved