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Adobe Photoshop is an industry standard piece of software for image editing. It is used by photographers, graphic designers, web designers, videographers, 3D artists, typographers, students, and others. It is primarily a pixel-based (raster) image editing program, but it does contain some vector graphics editing, text layout, and video capabilities as well.
Photoshop has an immense user base, and there are many, many resources available online and in print for people wishing to learn to use the program.
LinkedIn Learning @ Penn
LinkedIn Learning provides over 77,000 training videos related to new technologies and software. Faculty, students, and permanent staff can access LinkedIn Learning through Pennkey access.