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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

Digital Images

Chapter 8,

Exploring the Digital Domain

storing digital images
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
storing digital images1
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
storing digital images2
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
storing digital images3
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)
storing digital images4
Storing Digital Images

RGB color model represents natural color as a combination of three channels: RED, GREEN, and BLUE

  • Here is the BLUE channel
storing digital images5
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

storing digital images6
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
storing digital images7
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
storing digital images8
Storing Digital Images

The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK

  • Here is the MAGENTA channel
storing digital images9
Storing Digital Images

The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK

  • Here is the YELLOW channel
storing digital images10
Storing Digital Images

The CMYK color model employs four channels to create color: CYAN, MAGENTA, YELLOW, and BLACK

  • Here is the BLACK channel
storing digital images11
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

storing digital images12
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

storing digital images13
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
image layers
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

image layers1
Image layers
  • Digital image layers are created using alpha channels as masks
  • A separate channel indicates which pixels are opaque and which are transparent
storing digital images14
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
storing digital images15
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
storing digital images16
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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