Resampling
The practice of interpolating an image of one specification and producing an image of another specification from that interpolation.
Resolution
Defines image quality of a display. It refers to the number of pixels available on a display. Resolution controls the level of detail that can be presented on a screen.
Retouch
Digital image editing processes used to restore damaged photographs for reproduction
RLE
Run-Length Encoding: a data compression technique that records repeated data elements with the same value, which is coded once along with a count of the number of times it occurs.