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

Abstract

The invention relates to the technical field of thermal printing, and discloses a watermark printing method of a thermal printer, a storage medium and thermal printing equipment. The watermark printing method comprises the steps of: converting initial binary printing data of a watermark into gray scale data according to a watermark command; and after carrying out error diffusion processing on the gray scale data, forming new binary printing data through an image binarization algorithm. According to the invention, the thermal printer converts the initial binary printing data of the watermark into the gray scale data according to the watermark command; error diffusion algorithm processing is carried out on the gray scale data, then the new binary printing data is formed through the image binarization algorithm, and original continuous heating points can form staggered interval points due to algorithm processing, so that characters with reduced concentration are formed and presented, the added watermark has certain transparency, normal printed texts cannot be shielded, and a better watermark increasing effect of thermal printing is achieved.

Description

technical field [0001] The invention relates to the technical field of thermal printing, in particular to a watermark printing method, storage medium and thermal printing equipment of a thermal printer. 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, which is coated with a layer of coating that will produce a chemical reaction and change color when exposed to heat, similar to photosensitive film, but this coating will change color when exposed to heat. Due to the characteristics of thermal coatings, thermal printing technology has emerged. [0003] It can be seen fr...

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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