Vector is object(shape) based bound together by anchor points to form a solid object (if those anchor points join/connect). Rastor is purely Pixel based, simply meaning that an image is created by color values assigned to it on a pixel by pixel basis.(most commonly photographs and scanned images). NOTE: Since version 6 Photoshops Vector capabilities have improved and for a brief overview see this spec from Adobe. And, yes, Photoshop's vector shapes is by no means a figurehead in comparison, but what tools are available offer no real limitation as to what they can do. Often, Photoshop's vector capabilities are quickly shot down by those familiar with true vector programs, like Adobe Illustrator, Corel Draw, or Macromedia Freehand. I'd like to show you a technique on how to vectorize from a photo reference in Photoshop.
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