Mac PowerPoint - border lines appearing when viewing on Sharepoint.

Question

I'm having an issue with PowerPoint on Mac where borders are being added to some images when viewed through a browser. Those images can be .png, .jpg, .ai, or .eps. I've tried saving them in different formats, copy/pasting, or inserting from file. I tried turning off image compression, and turning off hardware acceleration. The PPT is created on a Mac desktop, latest version. The dimensions are 13.333 in, 7.5 in, and the raster images are 300dpi, the others are vectors. Attached is a vector graphic on the right, and a jpg on the left for example. Any ideas? Thanks for any help!

Answer 1

Hello,

This is almost always a rendering artifact in PowerPoint for the web and the SharePoint viewer.

Thin hairline borders can appear around placed images or vectors when the browser scales them. The quickest fix is to use the picture-as-fill method so the object has no independent image edge for the browser to antialias.

In PowerPoint for Mac, duplicate the slide so you have a backup. Draw a rectangle exactly over each affected image so it matches the same size and position. With the rectangle selected, open Format Shape > Fill > Picture or texture fill, then insert the same image.

Make sure Tile picture as texture is off so it stretches once. Set Outline to No line. Delete or hide the original image behind it.

Save the file and view it again in SharePoint in the browser. The unintended borders should be gone. If they do not, tell me and I will guide you to the next step.