Photos are raster-based images (rasters are small squares called pixels)
Photos
- Measured in resolution
- refers to the number of pixels that describe an image and establish its detail
- determined by number of pixels along the width and height of an image
- Think of resolution as depth of image quality
- The higher the resolution the better the image quality
Resolution and size are inversely related
- If physical size increases, resolution (quality) decreases
- If physical size decreases, resolution (quality) increases
- Resolution measured in ppi or dpi
- Images on the Web should be 72 dpi
- High-quality print images should be at least 300 dpi
Vectors
- Vectors are mathematic (made of lines based on x-y coordinates)
- No dots!!!
- No matter how big you make a vector image, quality will not change!
- Images can be made using vectors, but don’t have the same “true to life” quality as pixels
- Although text can be made using pixels, text should always be made with vectors!!!!
Photoshop
- Raster-based
- Alter or create photos
InDesign and Illustrator
- Vector based
- Place photos & add text