How to add digital watermark to BMP images with C language

Using C language to add text to existing bmp pictures to generate new pictures is:

1, first of all, you should understand the structure of bitmap file, be familiar with the basic knowledge such as drawing function of C language, and you can find self-study on the Internet;

2.BMP (full name bitmap) is a standard image file format in Windows operating system, which can be divided into two categories: device-dependent bitmap (DDB) and device-independent bitmap (DIB). It uses bitmap storage format and does not use any other compression except image depth. So BMP files take up a lot of space. When storing data, the image is scanned from left to right and from bottom to top. Because BMP file format is the standard for exchanging image-related data in Windows environment, all graphics and image software running in Windows environment supports BMP image format, and the color value of each pixel in the image is saved in BMP file.

3.c language is a computer programming language, which has the characteristics of both high-level language and assembly language. It can be used as a system design language to write working system applications, and it can also be used as an application programming language to write applications independent of computer hardware. Therefore, it has a wide range of applications.

The most direct way to display BMP image in C language is to extract the color value of each pixel first, and then draw it with the drawing function of C language.