Types of Images

• Bitmap Images - Images where information about each pixel is stored.
  • Photographs
• Vector Images -  Images drawn with math creating shapes, gradients, and fonts.
  • Logos, Banners, Original Artwork

Common Bitmap Image File Types: 

• .PNG - Portable Network Graphics (2004)
• .JPG / .JPEG - Joint Photographic Experts Group
• .GIF - Graphic Interchange Format (1987). In 1999 Unisys began enforcing .gif patents.

Other Image File Types: 

• .TIFF (Bitmap) - Tagged Image File Format (1992) owned by Adobe
• .AI (Program File) - Adobe Illustrator. Program file for designing vector artwork. 
• .EPS (Vector Image) - Encapsulated Post Script. Vector images like original logo art, was the early file format for Illustrator. 
• .SVG (Vector Image) - Scalable Vector Graphics. Open standard for vector images, mainly used for icons and animation. 

Resampling VS. Resizing

• Resampling - Making an image a new size natively using a photo editing program. Can make the file size smaller when resizing down.  
• Resizing - Changing the dimensions of an image in a website without changing the file size (bad practice).