Watermark printing method, storage medium and thermal printing device of thermal printer

Abstract

The invention relates to the technical field of thermal printing, and discloses a watermark printing method, a storage medium and a thermal printing device of a thermal printer. The watermark printing method includes: converting the initial binary printing data of the watermark into a gray scale according to a watermark command data; after error diffusion processing is performed on the grayscale data, new binary printing data is formed through an image binarization algorithm. The thermal printer of the present invention converts the initial binary printing data of the watermark into gray-scale data according to the watermark command; performs error diffusion algorithm processing on the gray-scale data, and then forms new binary printing data through the image binarization algorithm, the original continuous The heating points will be formed at random intervals due to algorithm processing, so that the text with reduced density will appear, so that the added watermark has a certain degree of transparency, and will not block the normal printed text, achieving a better watermark increase effect for thermal printing.

Description

technical field [0001] The invention relates to the technical field of thermal printing, in particular to a watermark printing method of a thermal printer, a storage medium and a thermal printing device. Background technique [0002] Thermal printing technology was first used in fax machines. Its basic principle is to convert the data received by the printer into dot matrix signals to control the heating of the thermal unit, and to heat and develop the thermal coating on the thermal paper. Thermal printers have been widely used in POS terminal systems, banking systems, medical instruments and other fields. Thermal printers can only use special thermal paper. The thermal paper is coated with a coating that will change color due to chemical reaction when heated, similar to photosensitive film, but this coating will change color when heated. This characteristic of thermal coatings has led to the emergence of thermal printing technology. [0003] It can be seen from the above ...

AI Technical Summary

Problems solved by technology

The existing technology is to simply superimpose the printing data of the printed text and the printing data of the watermark. Since the thermal printing of the text and the watermark are continuous, the text and the watermark of the thermal printing are pure black text, and the thermal printing increases The effect of the watermark is as figure 2 As shown, where the normal text and the watermark overlap, the pure black watermark text will cover the normal text text, resulting in the text content not being displayed normally and affecting the legibility of the text text

[0004] In addition, the existing technology also uses the diffusion processing printing watermark that comes with the computer driver, which can achieve the effect of changing the shade of the watermark, but it is inconvenient to handle, especially for portable printers, it cannot be realized.

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