Compression

Lossy - removes parts of the image to reduce the file size, so it has an effect on the image


Lossless - no effect on image, but reduces the file

Advantage of compression?
* takes less time to load image (in browser)
* less memory used
* less time to upload/email

Disadvantages

* takes time to compress images, longer for larger images
* can alter the images, effecting the quality
* repeted compression can ruin the image completely

JPEG - joint photographic experts group
Lossy!!!! -
GIF - graphics interchange format

TIFF - tagged image file format

MPEG - moving pictures experts group