12 Questions
What is the primary difference between RGB and CMYK color models?
RGB is additive, while CMYK is subtractive
What is the characteristic of a grayscale image?
It contains only shades of gray and no color
What is the primary advantage of TIFF images?
They contain a lot of detailed image data
Why are JPEG files commonly used in digital cameras?
They are highly compressed and allow for more storage on camera cards
What is the primary difference between GIF and JPEG compression?
GIF compression is lossless, while JPEG compression is lossy
What is the primary purpose of PNG files?
To replace GIF files and provide an open format for web use
What is the basic building block of a digital image?
Pixel
What type of image is composed of paths rather than pixels?
Vector
What is the effect of resizing a bitmap image?
The image becomes distorted with indented edges
What is the color model used for digital images?
RGB
What type of image can be scaled to a larger or smaller size without losing quality?
Vector
What is a rectangular grid of pixels commonly referred to as?
Bitmap
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.
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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