Question | Answer |
Graphic Image | A visual design or representation made using various methods and programs (ex. painting, drawing, shape, photograph) |
Pixels | Small squares of color in a grid; A collection of pixels can produce an image |
Bitmap Image | Also referred to as raster image; Are a complex image made up of pixels that usually create realistic images or photos (created with paint programs) |
Vector Graphic | Drawing created by using a series of lines and curves that usually create images like clip art, cartoons, diagrams, maps, etc. and can be resized without loading clarity (created with drawing programs |
Resolution | The clarity of an image, expressed as dots per inch (dpi) or pixels per inch (ppi); The higher resolution, the greater the image detail |
Compression | Reducing the size of an image; 2 types: lossy and lossless |
Lossless | Compression reduces the file size without losing any pixel information |
Lossy | Compression reduces the size of an image file by removing or simplifying data that is not essential (the greater the lossy compression, the poorer the quality of the image) |
File Formats | Tells the computer how to display, print, and process, and save the data; Dictated by the application program which created the file, and the operating system under which it was created and stored |
GIF | Lossy raster file format that reduces the number of colors in an image (best for web pages, small icons, etc.) |
BMP | Lossy raster file format similar to GIF |
PNG | Lossless raster file format that preserves image detail and preserve transparency (good general purpose format) |
TIFF | Lossless raster file that preserves image detail and preserve transparency (works best for high quality printing, files are quite large) |
JPG | Raster file format commonly used for photographs and images (for low to medium resolution needs, or pictures that do not require transparency); Most common digital format |
WMF | Windows meta file; Used for vector graphics |
Aspect Ratio | Ratio of width to height; Must be maintained when image is resized to avoid distortion |