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Raster Graphics

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 . Notice the pixels. Bitmap enlargement.

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Raster Graphics

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  1. Raster Graphics 2.01 Investigate graphic image design.

  2. 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 Notice the pixels Bitmap enlargement Image source: http://graphicssoft.about.com/od/aboutgraphics/a/bitmapvector.htm

  3. Common Raster Formats • GIF • JPEG • BMP • PNG • TIFF

  4. 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. AnimatedGif

  5. 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

  6. 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

  7. 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

  8. 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

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