After inserting a picture in your slide, you should first consider if the picture you have used complements the message of your presentation and slide. Even if it is relevant, you should consider making it more pertinent by removing the areas that may be not required. In other words, you must ponder and decide whether you want to use PowerPoint’s Crop options. Cropping an area removes extraneous areas, and lets you add focus to the areas of the picture that are appropriate to the topic of your presentation.
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