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Want to increase your Bubble Jet IQ ? Come on over >> Printer Driver Image-Processing Technologies There is little point in producing beautiful image data if it cannot be output appropriately. For this reason, Canon brings together its experience and technologies in the image-processing technologies of its printer drivers. There are six categories of technologies used to send instructions on printing out images from computers. These are multi-value expression, color adjustment (color matching and Photo Optimizer), image optimizer, color conversion, halftoning (dither pattern and error diffusion), and compression/decompression. Firstly, original image data is input as gradation values of the three primary colors red, green and blue. These signals are adjusted into R', G' and B' (color adjustment), then converted into cyan, magenta, yellow and black (CMYK) gradation values for printing in the color conversion process. (Cyan, magenta, yellow and black represent the coloring material colors + black. The BJC-8200 and other top Canon Bubble Jet printers have six inks, including Photo Cyan and Photo Magenta.) During halftoning, dots are converted to on/off information depending on gradation values and turned into CMYK dot data. Printer drivers operate as far as the compression stage of dot data. The data is then sent via cable to the printer, where it is decompressed. Ink ejection levels are controlled as required as the image is output. Although images displayed on a PC monitor are expressed in RGB values, output is in CMYK values. For this reason, there are at least minor discrepancies in the expression range. The key to printer driver image-processing technologies is therefore compensating for such discrepancies to output images as close to, or even better than, the original image data. Among the many adjustment technologies involved in this process, the Auto Tone Control (ATC) function adopted in the BJC-8200 Bubble i Jet printer is best matched to today's needs for brilliant and well-balanced photos. In the past, if the overall intensity of an image were uniformly raised, dark areas would become too dark. However, Canon's new technique involves the analysis of a histogram of the original image, after which the adjustment level is set. Using this technology, under-exposed portions of photos can now be expressed with precise gradations. The 1~ difference between illustrations and photos are automatically recognized, so that text, graphs and diagrams are output sharper and more vividly than ever before. Canon's diverse experience and technological know-how, amassed since its start as a camera manufacturer, are applied in printer driver imageprocessing technologies to ensure excellent output precision and quality. Sample of the Auto Tone Control (ATC) function   |
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Sample output of Bubble Jet printers
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