Combined storage of data for two printheads
First Claim
Patent Images
1. A method of processing image data representing plural colors for output to a color display device, comprising the steps of:
- generating blocks of digital image data signals representing rasterized image data of at least one pixel said signals representing data for display in at least two colors;
compressing the blocks of digital image data signals;
storing the compressed image data in a compressed form;
expanding the compressed image data;
after the step of expanding separating the expanded image data into separate color channels;
outputting the expanded image data to a color display device wherein the display device comprises two electronic writers and each writer receives data respectively from a respective one of the color channels for recording the data in a different color.
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Abstract
A method and apparatus for processing image data representing plural colors for output to a color display device such as a printer or soft display. A block of digital image data signals is generated representing rasterized image data of at least two colors. The block of digital image data is compressed and stored in a compressed form. The compressed image data is then expanded losslessly and output to a color display device.
42 Citations
35 Claims
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1. A method of processing image data representing plural colors for output to a color display device, comprising the steps of:
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generating blocks of digital image data signals representing rasterized image data of at least one pixel said signals representing data for display in at least two colors; compressing the blocks of digital image data signals; storing the compressed image data in a compressed form; expanding the compressed image data; after the step of expanding separating the expanded image data into separate color channels; outputting the expanded image data to a color display device wherein the display device comprises two electronic writers and each writer receives data respectively from a respective one of the color channels for recording the data in a different color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of processing image data representing plural colors for output to a color display device, comprising:
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generating first image data signals representing data for display in two colors, the image data signals representing first pixels of at least one color as grey level image data; recording and developing the data on a first image frame in an electrophotographic marking engine in accordance with a DAD-CAD recording operation wherein the data for one color is recorded using a first printhead and the data for a second color is recorded using a second printhead; transferring the developed image to a first receiver sheet; generating second image data signals representing second image data for display in one color, the image data signals representing second pixels as grey level image data wherein the number of grey levels of said second pixels exceeds the number of grey levels of said first pixels; recording and developing the second image data on a second image frame of said engine using said first printhead and in accordance with a DAD only recording operation; developing the image recorded on the second image frame; and transferring the developed image to a second receiver sheet. - View Dependent Claims (13)
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14. An apparatus for processing image data representing plural colors for output to a color display device, comprising:
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means for generating blocks of digital image data signals representing rasterized image data of at least one pixel, said signals representing data for display in at least two colors; means for compressing the block of digital image data; means for storing the compressed image data in a compressed form; means for expanding the compressed image data; means for separating expanded image data into separate color channels; means for outputting the expanded image data to a color display device; and a color display device, the display device including two electronic writers and each writer receives data respectively from a respective one of the color channels for recording the data in a different color. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of processing image data representing plural colors for output to a color display device, comprising:
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generating blocks of digital image data signals representing rasterized image data of at least one pixel said signals representing data for display in at least two colors; compressing the blocks of digital image data signals representing data for display in at least two colors without differentiating between the data by color; storing the compressed image data in a compressed form; expanding the compressed image data; and outputting the expanded image data to a color display device. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus for processing image data representing plural colors for output to a color display device, comprising:
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means for generating blocks of digital image data signals representing rasterized image data of at least one pixel, said signals representing data for display in at least two colors; means for compressing blocks of digital image data representing data for display in at least two colors without differentiating between the data by color; means for storing the compressed image data in a compressed form; means for expanding the compressed image data; and means for outputting the expanded image data to a color display device. - View Dependent Claims (32, 33, 34, 35)
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Specification