Data types – Images & Sounds
Jack Shepherd
Images:
Digital images are composed of binary:
-1 bit: 2 colours (black and white)
-2 bit: 4 colours
-3 bit: 8 colours
-4 bits: 16 colours
-8 bits: 256 colours
Metadata is data concerning data. Image metadata contains information about the resolution, bit depth and
size of pixels.
-Resolution: the amount of images tall x wide the image is, an image with higher resolution is of better quality
than one of low resolution.
-Bit-depth: the range of colours able to be replicated by each pixel, the higher the bit depth the more colours
can be used and so the image will be more life-like.
Images can be stored as vectors or bitmaps:
-Vector: a vector is an image type that is basically a series of calculations that generates a path from A to B.
(won’t pixelate). The file size of the vector file is also not affected by the size of the image itself.
-Bitmap: a bitmap is a type of image that is comprised of pixels (will pixelate if zoomed). The size of the file is
affected by the size of the image.
Sound:
Analogue sound data is sampled at intervals to create a digital file, the higher the sample rate, the better
quality the sound file.
Lower quality (lower sample rate)
Higher quality (higher sample rate)