Digital Imaging | Notes from Readings File Types | Week 1 Raster Images ● Made up of a set of grid dots (pixels) where each pixel is assigned a color ● Resolution dependent ● When you transform, you stretch the individual pixels, making the image blurry ● Typically used for photographs, digital artwork, web graphics ● Can be saved in CMYK or RGB ● Either Lossy or Lossless CMYK vs RGB ● ● CMYK is a four color printing process (cyan, magenta, yellow, and key [black]) ○ The colors represent the four inks that combine during the printing process ○ Files saved in CMYK are optimized for physical printing RGB is light based color (red, green, blue) ○ The three primary colors of light that combine to produce other colors ○ Files saved in this formal will be optimized for anything that appears on a screen Lossy vs Lossless ● ● Lossless images capture all the data of the original file ○ File may still be compressed ○ Will be able to reconstruct image to its original state Lossy images approximate what the original image looks like ○ Could reduce the amount of colors or analyze the image for any unnecessary data ○ Reduce file size, but also reduces image quality ○ Ideal for online where file size and download speed are vital JPEG/JPG ● A lossy raster format ● Stands for Joint Photographic Experts Group ● Most widely used formats online ● Have a sliding scale of compression that decreases file size but increases artifacts or pixelation the more the image is compressed ● ● Should be used when ○ Working with online photos and/or artwork ○ Want to print photos and/or artwork ○ Need a quick preview image Don’t use when ○ You need a graphic with transparency ○ You need a layered, editable image GIF ● Lossless raster format ● Stands for Graphics Interchange Format ● Widely used in web images, typically for animated graphics ● Can be exported in customized settings that reduce the amount of colors and image information ● ● PNG ● You should used a GIF when ○ Creating web animation ○ You need transparency ○ You need a small file Don’t use a GIF when ○ Need a photographic quality image ○ You need to print an image ○ You need a layered, editable image