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2.01 Understand Digital Raster Graphics

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1 2.01 Understand Digital Raster Graphics

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 Teacher Note: Enlarging raster graphics causes them to become pixilated (you can see the individual blocks of colors that make up the image).

3 Raster graphics 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.

4 Raster graphics 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.

5 Common Raster Formats PSD JPEG GIF PNG TIFF PDF

6 PSD – Photoshop document
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
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. Standard format for animation on the Internet Supports transparency Lossless compression Colors = 256 (8-bit)

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

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 Teacher Note: Browser software or image editing program may require the user to download a plug-in before recognizing or opening the file.

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 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.

11 PDF – Portable Document Format
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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