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The printing heads in inkjet printers are precision-engineered to perform a specific function: placing thousands of tiny ink droplets accurately on a sheet of paper to create a photo print. Ink is a critical component in the system. Each printer manufacturer formulates inks to meet the needs of the print heads in printers in their range. In some cases there is a different set of inks for each individual printer; in others, one ink set can be used with several models in the range.

If you own a digital SLR (DSLR) camera – or a high-end compact digicam – you will find it provides two file format settings: JPEG and raw (often shown as RAW). When you shoot a JPEG image, the camera’s image processor with adjust the contrast, sharpness, colour saturation and white balance BEFORE the image is saved to the memory card. When you shoot a raw image, this processing is deferred until the file is opened in a computer.