Actual sizeDisplaying the image on screen so that one pixel in the image exactly matches one pixel on the monitor. This is not the same as print size, which is determined by the resolution of the image.

Adjustment LayerSpecial layers that perform non-destructive tonal and color adjustments to all or part of the artwork; they can be turned on or off and altered as required.

AliasingThe opposite of anti-aliasing: no attempt is made at blending elements of the artwork to avoid jagged edges. This does have its uses: it can be used with very small fonts to avoid them becoming unreadable.

Alpha channelAn area used to store a layer’s selection information. This can be loaded and saved whilst the document is open; some file types can ...

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