Viewing Restrictions

Image Size

Available Number Of Colours (or Colors for US)

GIF's vs JPEG's vs PNG's

If more than one image is viewable on the screen at the same time, then they must share the colours that are available. For systems with millions of colours, this is not an issue. For systems with thousands it generally does not become an issue. It is only an issue with systems with 256 colours.

Warning The User

If you are going to use large images and they require a certain number of colours to really be viewable, let the user know. For example, on an intro page or a "test screen", tell the user the requirements. You could also give examples, such as a box, and ask them to set they window size so that they can see all of it.

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