The original picture without PS is a real picture.

a picture refers to a plane medium composed of graphics, images, etc. There are many formats of pictures, but generally they can be divided into two categories: bitmap and vector graphics. BMP, JPG and other formats are all bitmap graphics, while SWF, CDR, AI and other formats are vector graphics.

what we see in form is a general term for pictures, photos, rubbings, etc. Drawing is a basic term in technical drawing, which refers to a form of describing the geometric characteristics, shape, position and size of things with points, lines, symbols, words and numbers. With the development of digital acquisition technology and signal processing theory, more and more pictures are stored in digital form.

image format

bitmap, which is the standard image file format in Windows operating system, can be supported by various Windows applications. With the popularity of Windows operating system and the development of rich Windows applications, BMP bitmap format is naturally widely used.

The characteristic of this format is that it contains rich image information and hardly compresses it, but this leads to its inherent disadvantage: it takes up too much disk space, so BMP is more popular on a single computer. Hsb mode is defined based on the observation of color by human eyes. In this mode, all colors are described by hue or hue, saturation and brightness.