Before starting using Photoshop we need to have a basic understanding of how digital images work. There are some important terms and concepts, which will help us to enhance and adjust our images correctly and to make professional decisions with our Photoshop projects. We are going to use several devices when we work with digital images like digital cameras, scanners, monitors, printers etc and we need to know how to use them properly. Parts of this series: 1. Digital Image Theory 2. Working with Bridge 3. User Interface 4. Making Selections 5. Tonal and Colour Adjustments 6. Working with Layers 7. Retouching Images Pixel vs vector graphic There are two kind of digital images: vector and pixel images. Pixels are used for photographic images, while vectors are better for illustrations, text and shapes. Pixels are small building blocks like mosaics. Each pixel can show only one colour, but from a distance lots of pixels together can create the illusion of a smooth, photographic picture. Pixel images are resolution-dependant, but it is easy to manipulate them and use photographic effects on them. Photoshop is mainly a pixel-based graphic application. Vectors are created with curves and anchor points and they have the advantage of creating resolution-independant images. Photoshop has some vector tools like the Pen tool, the Type tool or the Shape tools but mainly Adobe Illustrator is used to create vector images. Facebook and on Twitter!