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Resolution
There are five options for the output resolution, four are pre-set values for quick selection and the fifth is for setting a specific value.

• thumbnail (8ppi) - very coarse
• screen (72ppi) - used for web designed a lot of the time
• medium (150ppi)
• high (300ppi)
• specific - type in your own custom value

The resolution of the output image is measured in pixels per inch (ppi). On a printer they talk about the output resolution in dots per inch (dpi). They are similar but not the same.

The higher (bigger number) the resolution the larger the file size.

For example:
To work out the file size of a 300ppi image of a 10" x 8" color image =
10" x 300ppi = 3000 pixels
8" x 300ppi = 2400 pixels
2400 pixels x 3000 pixels = 7,200,000 bytes or 7.2 megabytes

If the image is in 24bit color, it is also times 3 bytes per pixels, which is:
7,200,000 x 3 = 21.6 megabytes

If you set to use 2 x 2 anti-aliasing then a temporary file is written out at FOUR (2 x 2) times the final file size and imaged back to the final size. This is called oversampling.

21.6 x 4 = 86.4 megabytes as a temporary file.

Hint:
The higher the resolution value the larger the file size. ppi stands for "pixels per inch".

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Color Space - Anti-Aliasing - Appearance