giphy

You can use the site giphy.com to generate animated gif files. The site works with video files that you upload. See the option to create a gif file on the home page at the top right. Simply drag a video file (in .mov or .mp4 format) As you can see there are sliding scales which you adjust to determine where the animation of the gif should be begin and how long it should last:

You are given the option to add a caption to the .gif. After clicking on 'Create GIF', you can click on the Advanced tab for the option to download the .gif file you created.

The resulting gif can be inserted into a PowerPoint slide. It will display in animated mode when you enter presentation mode.

PDFs Can Be Uncropped

Be careful if you are exchanging PDFs that you have cropped with other parties. If you crop a PDF in Adobe Acrobat, even after you save it as a new file, and email it, another user can still open it in using different software.

As the screen grabs below show, it's possible to crop a PDF in Adobe Acrobat, and then undo the cropping action using Nuance Power PDF advanced.

Query by Image Content

Query by Image Content software allows you to search for images similar to one that you select. Consider trying out the free program Sepham SearchByDrawing, which is available for download here, http://www.sepham.com/. If you have a set of mostly images quite different images:

. . . and want to find which are similar to one that you're focused on, you load up your selected image on the left, check off a directory in the center, and get your results on the right.

The software does a tolerably good job of finding photos of other tigers, but as you can see it's more focused on the actual form of the object in the image. It finds the exact duplicate of our selected tiger, but it assigns a llama with a pose similar to the selected tiger a higher rank than the second photo of the tiger in the set. It doesn't find any similarity between the photo of the tiger and a drawing of one.