Raster graphics
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Raster graphics

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  • 1.01 Investigate graphic types and file formats.
  • Teacher Note: Enlarging raster graphics causes them to become pixelated (you can see the individual blocks of colors that make up the image). 1.01 Investigate graphic types and file formats.
  • 1.01 Investigate graphic types and file formats.
  • 1.01 Investigate graphic types and file formats.
  • Teacher Note: This format is best for images containing many colors or shades of color. Most digital cameras save the images made with the camera as JPEG files on their memory cards. 1.01 Investigate graphic types and file formats.
  • Teacher Note: When editing images, all the changes would be made to the BMP file. When the user is satisfied with the final image, they would then save the BMP as a different file format depending on their intended use of the image. (For example, if it will be used on a website, the images would be saved as a compressed file format such as GIF or JPEG.) By on-screen display, this means displayed on the monitor but is referring to images that are on the desktop computer, not from Internet websites. 1.01 Investigate graphic types and file formats.
  • Teacher Note: Browser software or image editing program may require the user to download a plug-in before recognizing or opening the file. 1.01 Investigate graphic types and file formats.
  • Teacher Note: TIFF images have very high quality which is ideal for faxes or printed images, such as those used in desktop publishing. However, this results in a large file size so it is not recommended for images that will be viewed over the Internet. 1.01 Investigate graphic types and file formats.

Raster graphics Raster graphics Presentation Transcript

  • Raster Graphics 2.01 Investigate graphic image design.
  • Raster Graphics
    • Also called bitmap graphics
    • Consist of grids of tiny dots called pixels
    • Have a fixed resolution and cannot be resized without altering image quality
    • Edited in paint programs
    Bitmap enlargement Notice the pixels Image source: http://graphicssoft.about.com/od/aboutgraphics/a/bitmapvector.htm
  • Common Raster Formats
    • GIF
    • JPEG
    • BMP
    • PNG
    • TIFF
  • GIF – Graphics Interchange Format
    • Animation – Standard format for animation on the Internet.
    • Transparency – yes
    • Lossless compression
    • Colors = 256 (8-bit)
    • Most common format for:
      • Text
      • Clip art, animations, icons, logos
      • Simple diagrams, line drawings
      • Graphics with large blocks of a single color
      • Graphics with transparent areas
      • Images displayed on computer screens and on websites.
    Animated Gif
  • JPEG – Joint Photographic Experts Group
    • Animation – No
    • Transparency – No
    • Lossy compression
    • Colors – 16.7 M (24-bit)
    • High quality but larger file size than a GIF
    • Commonly Used For:
      • Desktop publishing photographs
      • Photographs and natural artwork
      • Scanned photographs
      • Emailing photographs
      • Digital camera photographs
  • BMP - Bitmap
    • Animation – No
    • Transparency – No
    • Uncompressed
    • 256 colors
    • Large file size - not well suited for transfer across the Internet or for print publications
    • Commonly Used For:
      • Editing raster graphics
      • Creating icons and wallpaper
      • On-screen display
    Icons
  • PNG – Portable Network Graphics
    • Animation – no
      • Transparency – yes
    • Lossless compression
    • 256 colors
      • Not suited for photographs
      • Biggest Disadvantage: Not widely supported by web browsers and image viewers/editors without plug-ins.
    • Commonly Used For:
      • Replacing GIF and TIFF images
      • Online viewing of images
    • See examples at http://graphicssoft.about.com/od/freedownloads/l/blfreepng07.htm
  • TIFF – Tagged Image File Format
    • Available in compressed and un-compressed formats
    • Compressed is advised
    • Commonly Used For:
      • Storage container for faxes and other digital images
      • To store raw bitmap data by some programs and devices such as scanners
      • High resolution printing
      • Desktop Publishing images