Export Transparent PNG
I would like to have a switch on PNG export to delete the slide master background and export the slide with the transparent background. The resulting image would be the normal size of the frame, but only text or objects within the slide would be visible. Images or other non-outliner objects on the master would not be visible.
Reason? PowerPoint makes a great titling app for video, automating much of the process. This would make creating titles (or subtitles/open caption) for video insertion very convenient by bypassing the chromakey step needed to get them into a video timeline.
You can also make things easier by creating page size presets that yield standard HDTV file sizes on export: 1080p - 20x11.25in. UHD: 40x22.5. ("Widescreen" is already 720p 13.34x7.5in.)
Jamie Garroch commented
Since background transparency can be set on the slide, layout and master, it would make sense to support transparent slide export and with the latest version of PowerPoint that supports the export to animated GIF, this request makes even more sense. The current implementation falls back to using the theme’s Background 1 colour (either Light 1 or Dark 1 based on the background style).
It would be nice to do this so you can export as a video/GIF file without the slide background. Exporting images in PNG is not difficult.
You can already do this by right click, save as image, and then set to PNG. However to the best of my knowledge, to get the transparent backgorund, you have to do this slide by slide. Exporting all slides from the standard export menu as PNG pulls the slide master white background into them all. In the standard export as PNG we just need a checkbox (transport background). Simple.