High quality colour magazines can go to 300 LPI. Offset printing, as used in newspaper production, usually ranges from 85-133 LPI. A higher LPI figure indicates greater detail and sharpness. It indicates how close together the lines in a halftone grid are. Applies to four colour reproduction in magazines and newspapers. Lines per inch: a measure of resolution, usually screen frequency in halftones. Virtually all digital cameras can save images in JPEG. This group established a standard method for compressing and decompressing digitised photos or images. The amount of data stored in an image file, measured in pixels per inch (ppi). The main attribute of a colour that distinguishes it from other colours. The lightest part of an image, represented in a halftone by the smallest dots, or the absence of dots. The reproduction of a continuous-tone image, made by using a screen that breaks the image into various size dots. GREY SCALE IMAGEĪn image consisting of up to 256 levels of grey, with 8 bits of data or more per pixel. The basic method of recreating a broad spectrum of colours on a printing press. DPIĭots per inch: a measure of image resolution. The tonal gradation between the highlights, mid tones, and shadows in an image. The process of splitting full-colour artwork into its CMYK components one or all four of the separate pieces of film from which a four-colour version will be printed.Īn image containing gradient tones from black to white. The changing of the colours of pixels in an image, including adjusting brightness, contrast, mid-level greys, hue and saturation to achieve optimum printed results.Ī representation of the final printed product, for checking colour accuracy and other elements. A CMYK image is generally used to print a colour separation it is also the way that inkjet printers output colour images, taking the original RGB image and translating it in the printer. CMYK IMAGEĪ four channel image containing a cyan, magenta, yellow, and black channel. The four process colours used in printing: cyan, magenta, yellow, and black (K). The term ‘Brightness’ is used to describe differences in the intensity of light reflected from or transmitted through an image independent of its hue and saturation. One of three dimensions of colour the other two are hue and saturation. Adding bit depth allows the rendering of more colours. The only colours displayed in a single bit mapped image are black and white. BIT MAP IMAGEĪn image with 1 bit of colour information per pixel is also known as a bit mapped image. Feel free to let us know what other terms that you’d like covered in comments below. Lets’ try to make it easy with some photography definitions and the start of a glossary. Got your bits mixed up with your bytes? Is a halftone less than a semi-quaver? Computer terms can often be a mess of confusing jargon.
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