Error Diffusion - A screening technology used in digital continuous tone printers where fixed-sized dots are placed based on image detail and tone values to enhance sharpness and detail while avoiding posterization problems.

Telephoto Lens - This category has a focal length that is greater than 50mm for 35mm cameras and makes the subject seem closer.

Artifact - Unwanted visual anomalies or defects generated by an input or output device, or by a software operation, that degrade image quality.

DPI (Dots Per Inch) - The unit of measure used to describe the resolution of image files, scanners, or output devices. The measure of distinct pixels that a device can produce either horizontally or vertically in one inch.

Digit - A single unit from which all data is built.

Image Noise - Image noise creates specks of the wrong color in a digital image. Image noise usually occurs in low-light conditions when a camera's light sensor registers an incorrect value, for instance recording yellow when it should record black. This error causes small dots to appear in the image. Higher quality cameras should have very little noise, even at high ISO settings.

Advanced Photo System Cassette - The film cartridge loaded into the camera and then used to store the processed negatives. It has indicators to show if the film a) is new b) has been used (exposed) partly c) has been used (exposed) completely d) has been processed. If the Film has been completely used or processed, the cassette cannot be put back into the camera.

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