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  • Liza Daly thinks this is interesting:

Slideware comes with a wide range of templates and preselected color palettes, and you can make your own simple color palettes as well. An easy but underutilized technique is to create a unique color palette from a few colors in one of your photographs. Choose colors that you think set the appropriate tone for the visual presentation. To do this, click the color picker or eye dropper on the desired portions of the image.

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+1 One of my favorite techniques for making visually pleasing slides despite no artistic ability is to select the colors from the images and use for the text.