Photoshop and Illustrator are forever open on my computer, and yet I am a big proponent of doing as much design as possible directly in PowerPoint. Very often, adding an effect or editing an image in PowerPoint is actually quicker than doing the same in Photoshop. And even more importantly, effects created natively in PowerPoint are almost always non-destructive, which means adjustments are far easier as presentation content continually shifts (because it always does...)
One of my favorite techniques in PowerPoint is to place a semi-transparent gradient box over full-page imagery. This is a way of "editing" the photo to make it fade out on an edge or to reduce the opacity over a part of the image and to allow for the placement of text on top of it.
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