Size & Resolution #
The scale of your images is highly important in creating an impressive and visually pleasing presentation. Your images should be a minimum of 720 pixels by 1280 pixels with a resolution of 72ppi or higher. Any smaller or lower resolution will severely diminish the quality and give you a potentially blurry image.

Contrast #
You want to choose a background that will have a high contrast against your message. If your text and background colors are too similar in shade or tone it will be difficult on the eyes to read. The greater the contrast the better.


Composition #
Composition is also a key factor in increasing legibility. It is much easier to read your message against negative space in a photo rather than on top of the subject matter.

Focus #
If you were going to have a lot of text on screen or perhaps you’d like your message to be front and center, a picture with a soft focus or slight blur will really let your text shine. A busy background will do the opposite, and bring focus away from your focal point.

