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Raster image processor

A raster image, processor technology, applied in the direction of image communication, instruments, permanent visual display devices, etc., can solve the problem of not providing printed images as expected

Pending Publication Date: 2021-11-26
易客发有限公司
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Problems solved by technology

This results in not delivering the printed image on the selected substrate as expected

Method used

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Embodiment Construction

[0041] Ink Usage Predictor

[0042] The Ink Usage Predictor is a tool to predict the amount of ink that will be used for halftone raster images (RT) on a selected printing device. Said means is typically a data processing system adapted to predict said quantity, or a computer program comprising instructions for predicting said quantity. The computer program is preferably stored on a computer readable storage medium.

[0043] After halftoning a continuous tone image (CT) to a halftone raster image (RT), the pixels of the raster image are analyzed and a certain amount of ink per pixel is determined by the ink usage predictor. The sum of the determined ink volumes per pixel determines the ink volume required to print a copy of the continuous tone image on the selected substrate by the printing device. Also, the amount of each ink is determined for each non-image pixel by the ink usage predictor. This is not self-zeroing because ink can flow to said non-image pixels during or...

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Abstract

A raster image processor (RIP) for digital binary halftoning a continuous tone image (CT) by a threshold tile (TT) into a halftone raster image (RT) for a printing device capable of printing on a plurality of substrates(S1, S2,..., SM); wherein said processor comprises an input field in which information regarding a substrate is to be used; a memory having stored thereon a plurality of threshold tiles (TT1, TT2,..., TTN) for generating regularly tiled halftone dots; and a threshold selector which is capable to select said threshold tile (TT) of said plurality of threshold tiles (TT1, TT2,..., TTN) based on information supplied to the input field.

Description

technical field [0001] The invention relates to the field of raster image processors (RIPs) for digitally halftoning continuous tone images and in particular printing the images by means of lithographic or flexographic printing presses. Background technique [0002] Presses and digital printers cannot vary the amount of ink or toner applied to a particular image area except through digital halftoning, also known as dithering or screening. Digital halftoning is the process of rendering the illusion of a continuous-tone image with multiple dots (also known as halftone dots). A digital image produced by digital halftoning is called a halftone raster image or screen. Both multilevel and binary halftoning methods are known. Halftone dots produced by the binary method consist of pixels representing image data and pixels representing non-image data. [0003] Binary digital halftoning is a well-known technique explained in detail by Robert Ulichney in his book "Digital Halftoning...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/405
CPCH04N1/4055G06K15/1881H04N1/4051
Inventor R·巴尔特尔斯
Owner 易客发有限公司
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