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Digital Images

Digital Images. Chapter 8, Exploring the Digital Domain. Storing Digital Images. RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE. RGB color model employs additive primaries RGB color is employed by most color video displays.

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Digital Images

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  1. Digital Images Chapter 8, Exploring the Digital Domain

  2. Storing Digital Images RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE • RGB color model employs additive primaries • RGB color is employed by most color video displays

  3. Storing Digital Images RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE • Here is an RGB image • We will separate it into three separate color channels for comparison

  4. Storing Digital Images RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE • Here is the RED channel • Note that bright values denote high amounts of red; dark means low amounts

  5. Storing Digital Images RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE • Here is the GREEN channel • It closely resembles the normal graylevel image (black and white photo)

  6. Storing Digital Images RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE • Here is the BLUE channel

  7. Storing Digital Images • CMYK is based on subtractive primaries (paint pigments) • is used for printing • employs BLACK (K) for highlights and details The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK

  8. Storing Digital Images The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK • Here is a CMYK image • again, we will separate it into four channels

  9. Storing Digital Images The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK • Here is the CYAN channel • Note that white space here means no ink or pigment; dark means a concentration of ink

  10. Storing Digital Images The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK • Here is the MAGENTA channel

  11. Storing Digital Images The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK • Here is the YELLOW channel

  12. Storing Digital Images The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK • Here is the BLACK channel

  13. Storing Digital Images • HSB resembles how artists conceive color properties • HSB color is depicted by a 3-D polar coordinate system HSB color is defined by three separate values: HUE, SATURATION, and BRIGHTNESS

  14. Storing Digital Images • A single hue value is depicted with a series of changing brightness and saturation values HSB color is defined by three separate values: HUE, SATURATION, and BRIGHTNESS

  15. Storing Digital Images • INDEXED COLOR images are derived from full color images • INDEXED COLOR images are smaller or more compact in storage • are composed of pixels selected from a limited palette of colors or shades

  16. Image Layers • a digital image layer is a component of an image that exists as a separate plane • image layers can be edited separately DUCKY the type is a separate layer

  17. Image layers • Digital image layers are created using alpha channels as masks • A separate channel indicates which pixels are opaque and which are transparent

  18. Storing Digital Images • Digital images are converted to files for storage and transfer • The file type is a special format for ordering and storing the bytes that make up the image • File types or formats are not necessarily compatible • You must often match the file type with the application

  19. Storing Digital Images • TIFF (Tagged Image File Format) • used by most document preparation programs • has optional lossless compression • Windows and Macintosh formats differ • GIF (Graphic Interchange Format) • indexed color image (up to 256 colors) • compressed • used in Web applications

  20. Storing Digital Images • JPEG (Joint Photographic Experts Group) • lossy compression with variable controls • also used in Web applications • WMF (Windows Metafile Format) • “metafile” formats permit a variety of image types • PICT • the metafile format for Macintosh apps

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