Intro to Photoshop for Nonprofits: Part 5
Tech Soup
APRIL 28, 2015
If you want to learn more about vector graphics, this Wikipedia article can give you a broader understanding of how they work. Check out Sprout Social's Always Up-to-Date Guide for Social Media Image Sizes for more info on that. Further Lessons. Mashable: 12 Beginner Tutorials for Getting Started with Photoshop.
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