Pixel
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Image Resolution - Image resolution is the quality of an image, film or game. The higher the specification of the console/computer (in terms of both software and hardware) the higher the resolution it can handle. An Xbox 360 uses 64-bit processor which means it can address more memory, allowing for higher resolution images to be displayed. This allows a game to have more detail and won't blur/distort as quickly when you zoom in closer.
Usually a game will be made in 32-bit or 64-bit but will get compressed for a phone, which means the game will lose some image quality.
Intensity - The intensity of a pixel determines the brightness, colour and quality of an image. Binary images will use the value of 1-bit pixels to indicate that it is either the foreground or background of an image. Byte images are the most common, "where this number is stored as an 8-bit integer giving a range of possible values from 0 to 255. Typically zero is taken to be black, and 255 is taken to be white." http://homepages.inf.ed.ac.uk/rbf/HIPR2/value.htm
Picture Resolution - Picture resolution is almost identical to image resolution, only a picture can be an illustration.
Picture Element - A picture element doesn't have a set size, but is a term for the smallest part of an image. if we go back to older newspapers, they used tiny dots of ink, which could be seen with a magnify glass. Each tiny dot is a picture element and was the smallest point of ink that could be made (within the expenses) at that time. http://www.wisegeek.com/what-is-a-picture-element.htm
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