Posts Tagged 'stretch effect'

PowerPoint Secrets – The Hard-edged Wipe

In 2014, I wrote a post about animating liquids (filling, pouring, etc.). In that post I provided an example using the Enter/Wipe animation effect – here’s the video from the post:

If I create a video from the same file using my current PowerPoint version (2013), this is what I get:

Observant readers will notice a difference between these two animations; the leading edge of the object is fuzzy or soft in the latest version. Here’s what happened: after PowerPoint 2007 (I think), Microsoft changed the animation effect from a “hard edge” to a “soft edge.” And, rather than make this an option, the geniuses simply eliminated the hard-edged wipe.

I believe this change was not limited to the Wipe effect but affected other animations and transitions but I don’t have the details.

If this change is acceptable or doesn’t affect your work, please browse my blog for dozens of other fascinating and useful posts. On the other hand, if you prefer the hard edge in some of your projects, read on for some ways to work around the change.

I want a hard edge in some of the projects I have detailed in this blog. I intend to add notes about this to earlier posts where needed but I may not get to all of them. Sorry.

I tried some effects that might work as a direct substitute for Wipe:

The Stretch/Collapse effects work as a hard-edged wipe but only for the shape with the uniform fill. The Peek effects appear to move the object in rather than expose it like the Wipe.

Of course, the distortion created by Stretch/Collapse is useful in some applications; see my post on opening a book.

The shape of the object is important, too:

As you can see, in the case of a non-rectangular shape, Stretch/Collapse is not the same as Wipe; Peek is a different effect.

Conclusion: Stretch is a direct substitute for Wipe only when the object is rectangular with a uniform fill.

But we can use an old PowerPoint trick to simulate Wipe:

Here I used the Collapse animation of a “mask” to reveal the arrow object; obviously this works for any shape or fill. The mask is a slide background filled (white) rectangle (outlined in red for clarity in the first example).

Here’s how this technique can be used to fill a non-rectangular vessel (the small sketch shows how the objects are “layered”):

Of course, the masking trick doesn’t always work – in particular, in cases where the slide background fill is not uniform:

Here the mask does not disappear against the background when it is animated; the slide background fill (a gradient) is static and does not track animations.

Here’s a way to “wipe” a uniformly filled object against a gradient background:

Create a rectangle with the same fill as the background; use Merge Shapes/Subtract to create an arrow-shaped hole. Put a gray rectangle between the hole and the background and apply a Stretch entry animation to the rectangle. This sketch shows the relationships:

In summary:

  • Stretch can substitute for Wipe for rectangular, non-rotated objects with uniform fill.
  • Using a background-filled “mask” and Collapse will mimic a Wipe for non-rectangular shapes with non-uniform fill. This won’t work with a non-uniform (e.g., gradient) background.
  • Using a background-filled “mask with a hole” will work for uniformly filled objects and a non-uniform background.

If you have more information about this topic, please share by commenting on this post. Thank you.

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