16 terms

Image File Formats and Types

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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)
Vector Graphics
Images represented by mathematical formulas that define lines, shapes and curves that can be resized without distorting the image.
Lossy
Where some data is lost during compression (JPEG and PNG))
Lossless
Where no data is lost during compression (TIFF, BMP, GIF, PNG formats)
RAW
Uncompressed optional file format used by digital cameras.
TIFF
Tag Image File Format: lossless, raster , 24 bit colour
GIF
Graphics Intercharge Format: lossless, 8 bit colour, supports transparency
Dithering
Method to reduce 'banding' in GIF images
BMP
Bitmap images: raster format, 24 bit colour: TIFF (uncompressed) and JPEG (compressed)
JPEG
Joint Photographic Experts Group: lossy, raster, 24 bit, no transparency.
PNG
Portable Network Graphic, 16 bit colour (more than gif, supports transparency)
PPI
Pixels Per Inch - digital image resolution (screen)
DPI
Dots per inch - out device resolution (printer)
Colour Depth
More bits gives more colours (depth) from 8-bit giving 256 colours (web safe) to 24-bit giving 16.7 million colours (True colour)
RGB
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)
CMYK
Subtractive colour model, used in colour printing (Cyan, Magenta, Yellow and Black)
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