Basic Digital Imaging Concepts
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Questions and Answers

What is the primary difference between RGB and CMYK color models?

  • RGB is subtractive, while CMYK is additive
  • RGB is used for printing, while CMYK is used for screens
  • RGB is additive, while CMYK is subtractive (correct)
  • RGB has more colors than CMYK
  • What is the characteristic of a grayscale image?

  • It contains only shades of blue and no color
  • It contains a combination of gray and color
  • It contains only shades of black and white
  • It contains only shades of gray and no color (correct)
  • What is the primary advantage of TIFF images?

  • They are suitable for web use only
  • They are limited to grayscale and black and white
  • They are highly compressed and small in file size
  • They contain a lot of detailed image data (correct)
  • Why are JPEG files commonly used in digital cameras?

    <p>They are highly compressed and allow for more storage on camera cards</p> Signup and view all the answers

    What is the primary difference between GIF and JPEG compression?

    <p>GIF compression is lossless, while JPEG compression is lossy</p> Signup and view all the answers

    What is the primary purpose of PNG files?

    <p>To replace GIF files and provide an open format for web use</p> Signup and view all the answers

    What is the basic building block of a digital image?

    <p>Pixel</p> Signup and view all the answers

    What type of image is composed of paths rather than pixels?

    <p>Vector</p> Signup and view all the answers

    What is the effect of resizing a bitmap image?

    <p>The image becomes distorted with indented edges</p> Signup and view all the answers

    What is the color model used for digital images?

    <p>RGB</p> Signup and view all the answers

    What type of image can be scaled to a larger or smaller size without losing quality?

    <p>Vector</p> Signup and view all the answers

    What is a rectangular grid of pixels commonly referred to as?

    <p>Bitmap</p> Signup and view all the answers

    Study Notes

    Digital Images

    • A digital image is composed of pixels, which are individual building blocks of every digital photograph and most other digital images, representing a particular color.
    • Pixels are arranged in regular patterns of rows and columns, forming a rectangular grid, commonly referred to as a bitmap or raster image.

    Bitmap (Raster) Images

    • Bitmap images have a fixed resolution, which means resizing may result in distortion and indented edges.
    • Examples of bitmap image formats include GIF, JPEG, PNG, TIFF, XBM, BMP, and PCX, as well as bitmap (i.e., screen) fonts.

    Vector Images

    • Vector images are composed of paths rather than pixels, making them scalable to larger or smaller sizes without losing image quality.
    • Examples of vector image formats include graphics created using CAD applications, PICT, EPS, WMF, and TrueType fonts.

    Digital Color Models

    • RGB (Red, Green, Blue) color model stores individual values for red, green, and blue, and is the color space for digital images.
    • RGB is an additive model, where 100% of each color mixed together creates white, and 0% creates black.

    CMYK Color Model

    • CMYK (Cyan, Magenta, Yellow, Key/black) is the color space for printed materials, with colors getting darker as they blend.
    • CMYK is a subtractive model, whereas RGB is additive.

    Paletted Color Model

    • Paletted is a color-restricted model, commonly seen in specific file formats such as GIF, consisting of a color palette of only 256 colors.
    • Early web browsers could only display a particular paletted set of 256 colors, referred to as "web safe" colors.

    Grayscale and Black & White Models

    • Grayscale is an 8-bit per channel system with only one color, providing 256 shades of gray.
    • Black & White is a 1-bit per channel system, with only two possible colors, black or white, suitable for text and line art.

    Digital Image File Formats

    • TIFF (Tagged Image File Format) creates uncompressed files, flexible in terms of color and content, but resulting in large file sizes.
    • JPEG (Joint Photographic Experts Group) files are compressed, storing a lot of information in a small file, making them suitable for digital cameras.
    • GIF (Graphic Interchange Format) compresses images using lossless compression, with an extremely limited color range, suitable for the web but not for printing.
    • PNG (Portable Network Graphics) was created as an open format to replace GIF, allowing for more colors and better compression.

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    Description

    Learn about the fundamentals of digital imaging, including pixels, bitmaps, and raster images. Understand how pixels are arranged in a grid to form an image and how they represent color and shade.

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