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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. - PowerPoint PPT Presentation

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  • 2.01 Understand Digital Raster Graphics

    1.01 Investigate graphic types and file formats.

  • Also called bitmap graphics Consist of grids of tiny dots called pixels Have a fixed resolution and cannot be resized without altering image qualityEdited in paint programs

    1.01 Investigate graphic types and file formats.

  • 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.*

    1.01 Investigate graphic types and file formats.

  • 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.*

    1.01 Investigate graphic types and file formats.

  • PSDJPEGGIFPNGTIFFPDF

  • Native file format for Adobe PhotoshopSupports transparencySupports layers, text, and effectsLarge file sizes.Industry standard for raster graphic editing1.01 Investigate graphic types and file formats.*

    1.01 Investigate graphic types and file formats.

  • Standard format for animation on the InternetSupports transparencyLossless compressionColors = 256 (8-bit)Most common format for:Text Clip art, animations, icons, logosSimple diagrams, line drawingsGraphics with large blocks of a single colorGraphics with transparent areas Images displayed on computer screens and on websites.

  • Does not support animation or transparencyLossy compression.Colors 16.7 M (24-bit)High qualityCommonly Used For:Desktop publishing photographsPhotographs and natural artworkScanned photographsEmailing photographsDigital camera photographs

  • Does not support animationSupports transparencyLossless compressionSupports multiple color depthsPNG 8 8 bit color Small GraphicsPNG 24 24 bit colorBasic Graphics

    Commonly Used For:Replacing GIF and TIFF imagesOnline viewing of imagesSee examples at http://graphicssoft.about.com/od/freedownloads/l/blfreepng07.htm

  • Does not support animation or transparencyAvailable in compressed (lossless) and un-compressed formatsCompressed is advisedColors 16 M (24-bit)Commonly Used For:Storage container for faxes and other digital imagesTo store raw bitmap data by some programs and devices such as scannersHigh resolution printingDesktop Publishing images

  • Open source, platform independent format that embeds fonts, images, layouts, and graphicsAllows choice of lossy and lossless compressionSupports 16 million colorsViewable with Acrobat Reader, a free program by Adobe

    Commonly used for:Sharing files regardless of available softwareShare files that can be protected from copying or editingPublishing electronic documents and ebooks

    1.01 Investigate graphic types and file formats.*

    1.01 Investigate graphic types and file formats.

  • Animation No Transparency No Uncompressed256 colorsLarge file size - not well suited for transfer across the Internet or for print publications

    Commonly Used For:Editing raster graphicsCreating icons and wallpaperOn-screen display

    *Teacher Note: Enlarging raster graphics causes them to become pixilated (you can see the individual blocks of colors that make up the image).***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.*Teacher Note: Browser software or image editing program may require the user to download a plug-in before recognizing or opening the file.*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.*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.*

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