Image Size Quality

Image size and quality -
Discard editing data - When an image is inserted the image dimensions get changed to fit into the document. It is possible that the image being inserted already has some information relating to editing perfomed previously. This option will remove any previous editing data. If you have made changes to a picture (eg cropping, brightness etc) the information to reverse this change is saved in the file. You can reduce the size of a file by removing this edited data.
Do not compress images in file - By default images are automatically compressed to help reduce the file size. If you want to keep the maximum picture quality then you can switch picture compression off.
Default resolution - Allows you to control the picture resolution for all the pictures in the chosen document. The default is 220 ppi.