To change the image size or the resolution size go to the tool bar at the top and click on image, scroll down to image size and click onto it. Once you have clicked onto it a box will come up with all the measurements and you can change the resolution which i have done to my image, or you can change the pixel size or the image size.
If you change the resolution to a much smaller number your image will become very pixeled, which are the blocks of colours that your images is made up off.
If you change the size off your image and blow the image up bigger the same thing will happen as you are stretching the image. These both will effect your image and sometimes it can make them look blurred and distorted., but this can be handy as if you wish to put your images onto a webpage or email them you have to change the resolution to quite a small one so that it doesnt take up to much room.
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