Image File Formats and Types
Raster Graphics (Bitmap)
Images composed of grids of pixels that have a fixed resolution and cannot be resized without losing image quality (also called bitmaps)
Images represented by mathematical formulas that define lines, shapes and curves that can be resized without distorting the image.
Where some data is lost during compression (JPEG and PNG))
Where no data is lost during compression (TIFF, BMP, GIF, PNG formats)
Uncompressed optional file format used by digital cameras.
Tag Image File Format: lossless, raster , 24 bit colour
Graphics Intercharge Format: lossless, 8 bit colour, supports transparency
Method to reduce 'banding' in GIF images
Bitmap images: raster format, 24 bit colour: TIFF (uncompressed) and JPEG (compressed)
Joint Photographic Experts Group: lossy, raster, 24 bit, no transparency.
Portable Network Graphic, 16 bit colour (more than gif, supports transparency)
Pixels Per Inch - digital image resolution (screen)
Dots per inch - out device resolution (printer)
More bits gives more colours (depth) from 8-bit giving 256 colours (web safe) to 24-bit giving 16.7 million colours (True colour)
Additive colour model in which three colours of light (Red, Green, Blue) are mixed together to display images on a screen. If 8-bits are used for each colour, result is 24-bit colour)
Subtractive colour model, used in colour printing (Cyan, Magenta, Yellow and Black)
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