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Raster Graphics

2.01 Understand Digital Raster Graphics. 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. Raster Graphics. Can support high color depths.

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Raster Graphics

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  1. 2.01 Understand Digital Raster Graphics Raster Graphics

  2. 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 Raster Graphics

  3. Can support high color depths. Most common type of raster is a digital photograph. Great for adding special effects. Work well for web design. Used to create images for print design. Raster graphics

  4. Native File Formats: file formats that are default file format that are proprietary to a specific program that are generally not meant to be used with other software. Standard File Formats: file formats that can be used with a variety of software programs. Standard file formats are usually created by using the “Save As” command or through exporting. Standard file formats include, but are not limited to: .gif, .jpg, .png, and .tif. Raster graphics

  5. Common Raster Formats • PSD • JPEG • GIF • PNG • TIFF • PDF

  6. 1.01 Investigate graphic types and file formats. PSD – Photoshop document • Native file format for Adobe Photoshop • Supports transparency • Supports layers, text, and effects • Large file sizes. • Industry standard for raster graphic editing

  7. GIF – Graphics Interchange Format • Standard format for animation on the Internet • Supports transparency • 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.

  8. JPEG – Joint Photographic Experts Group • Does not support animation or transparency • Lossy compression. • Colors – 16.7 M (24-bit) • High quality • Commonly Used For: • Desktop publishing photographs • Photographs and natural artwork • Scanned photographs • Emailing photographs • Digital camera photographs

  9. PNG – Portable Network Graphics • Does not support animation • Supports transparency • Lossless compression • Supports multiple color depths • PNG 8 – 8 bit color • Small Graphics • PNG 24 – 24 bit color • Basic Graphics • Commonly Used For: • Replacing GIF and TIFF images • Online viewing of images • See examples at http://graphicssoft.about.com/od/freedownloads/l/blfreepng07.htm

  10. TIFF – Tagged Image File Format • Does not support animation or transparency • Available in compressed (lossless) and un-compressed formats • Compressed is advised • Colors – 16 M (24-bit) • 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

  11. 1.01 Investigate graphic types and file formats. PDF – Portable Document Format • Open source, platform independent format that embeds fonts, images, layouts, and graphics • Allows choice of lossy and lossless compression • Supports 16 million colors • Viewable with Acrobat Reader, a free program by Adobe • Commonly used for: • Sharing files regardless of available software • Share files that can be protected from copying or editing • Publishing electronic documents and ebooks

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