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Category:Computer companies of China
Category:Companies based in BeijingThe present invention relates to an image output device, such as a color display, a video printer and a color facsimile machine, and a controller of the image output device.
Recently, image output devices, such as color display devices, video printers and color facsimile machines, have been developed to have more functions and more colors. The image output devices have been developed to enhance color reproducibility by supporting color models such as sRGB and CMYK.
To support such color models, devices are required to have a color memory capable of temporarily storing input image data, and a display memory capable of temporarily storing color signals for one page. These memories are provided as a buffer memory between an image processor and an output controller.
Meanwhile, in order to improve the color reproducibility, the image output devices have been developed to support a method of improving color reproducibility by correcting each color signal with an error diffusion algorithm. In this method, a highlight color, such as red or blue, and a shadow color, such as yellow or cyan, are converted into an additive color, such as white, by adding each color signal, in a color space, in which the color reproducibility is enhanced.
In the error diffusion algorithm, however, each color signal may be saturated and cause an image blurring. In this case, the color reproducibility is not improved, and each color may be diffused, i.e., blurred.
Accordingly, the image output devices are provided with a buffer memory, a color correction circuit and a color correction control circuit. In this case, when each color signal is saturated, the color correction circuit detects the saturation and converts the saturated color signal into a color signal close to the original color signal. The saturated color signals are corrected and then converted into the additive color signal.
However, the saturated color signals are converted to the additive color signal close to the original color signal by simply using one conversion value
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