Resolution:
Resolution is the number of pixels used to display an image, the more pixels there are on a screen, the higher quality an image will have for example on the iPhone 3gs there are 320 x 480 pixels which means the quality wasn't that great, but on the iPhone 4 there are 640 x 960 which means the quality was much better, below is an example of the 2 screens put side by side
Colour Depth:
Colour depth is used to show the maximum amount of colours that are able to be used in an image, the higher amount of colours used, the more realistic the image will appear. There are 4 types of colour depth; 256 colours, 16 bit colour, 24 bit colour and 32 bit colour.
Monochrome (e.g. Black & White): This has the lowest storage requirement 8 pixels stored in one byte
Greyscale (256 shades of Grey): a Byte can be one of 256 values, therefore information
for each pixel is stored in one Byte of storage
16 Bit Colour: This format uses two Bytes to store the information, one Byte for the colour
and one Byte for the shade of the colour.
24 Bit Colour: This format stores the Red, Green and Blue value for each pixel. Each
of these can be one of 256 values, giving a total of 16,777,216 colours
32 Bit Colour (True Colour): This
format uses the same format as above for the Red, Green and Blue colours but
also stores transparency information for each pixel. This allows each pixel to
be one of 256 values from fully opaque to fully transparent
No comments:
Post a Comment