Talking about Digital Imaging (I) - What is Digital Imaging?

Introduction The author hopes to explain digital images with easy-to-use texts, so that ordinary readers can understand this interesting topic with lively text. From this issue onwards, the author has planned to describe image sensors, computer monitors, digital photography, digital animation, scanners, image software and digital image output in eight stages.
The English relative noun of an image is Image, which is a visual reaction to the object, including shape, color, motion, and so on. Drawings and texts are one of the best human communication tools from ancient times to the present. Nowadays, the Internet and multimedia are developing rapidly to help information be transmitted effectively. I just saw the difference between Dot and Pixel. On the left is the enlarged ink dot of the ink-jet print image, and on the right is a computer-displayed pixel-related information technology program, which tells that the Chinese University set up a company a year ago to provide electronic clipping service. It is to promote the dissemination of information so that all walks of life can make effective use of information, improve social competitiveness and education culture. Information is arguably the most important kind of industry in the society. Probably the big and small industries all rely on information for living, as small as newspaper vendors, and as big as banking.
Video is a kind of information and a necessary element of the Internet and multimedia. If television, newspapers, or magazines don't have pictures, we must be boring. With advancements in science and technology, television stations and publishers are now digitally processing images. What are the methods of traditional image recording in digital video, such as painting and photography, analogically recording scenes, paint on a canvas or on a film (It is clear that black and white films generally produce images with black silver particles, while general color films use a layer of film. (or more) are the particle size of the magenta, cyan, and yellow stained particles, and the shape and color of the dense simulated scene. Simulating something in kind is analogy, so painting and traditional photography can be called analog images. In contrast, digital images are digital representations of images stored on hard disks or other storage media such as floppy disks or optical disks. Digital images can be generated directly from software, scanners, digital cameras or digital camcorders. Since the digital image is represented in digital form, the duplicated copy is exactly the same as the original, and can be freely output to any output device such as televisions, computer monitors, printers, and traditional and digital printing equipment. Digital images can consist of dots, lines, or faces. The situation is like the dots, lines, and faces used by paintings or graphic designers. Digital images can be divided into two major categories. The first is the bitmapped image, and the second is the vector image. The former consists purely of dots or pixels (short for the pixel-picture element). Digital photographs are the best example; the latter is composed of lines and faces, often used in computer painting. Regardless of artistic viewpoints, the quality of digital images depends on defects, namely, accuracy, colour depth, and resolution. Figure 1: A lecture by Adobe Systems in the United Kingdom in 1996. The topic is electronic publishing, which introduces many digital imaging technologies. Accuracy - refers to the color and shape accuracy of images produced by computer software or hardware or hardware devices. For example, the lens of a digital camera will deform the photo more or less. For example, the response of a photosensitive system of a digital camera to the color (correct response to light, explanation may refer to the color management of the fifth issue of this publication) is not 100% One hundred accurate. Let's talk about digital imaging equipment later.
Color Depth - Color depth determines the number of colors, consisting of bits. English is called color depth or bit depth. A larger bit represents a richer image color. A dollar in the computer stands for "0" or "1". It can also represent two conditions, "yes" or "no", "black" or "white". Each pixel in black and white without a grayscale image is represented by one bit, and each pixel of the 16 and 256 grayscale images is composed of 4 bits and 8 bits, respectively. 8 bits can also represent 256 colors, and larger bits such as 16-bit or 24-bit can produce 64K (1K for 1024) and 16.8 million colors, respectively. The following table explains the relationship between color depth and resolution, number of colors, and file size: Photo: One of the booths at the 1998 computer show placed a digital liquid crystal projector. After connecting to the computer, the computer data can be projected on the screen or on the wall. Figure 2: The electronic advertising light box in the 1997 exhibition at the Wanchai Exhibition. Table (1) Digital image resolution is set at 100ppi and size is 3R (3.5"X5") Table (2) Color depth of digital image is defined as 24-bit and size is 3R (3.5"x5") annotation
Byte - A byte consists of 8 bits, which represents 256 colors and is the most basic unit of text. A byte can represent an English letter, and a Chinese character needs two bytes.
Pixel per inch(ppi) -- Represents the resolution of a digital image. How many pixels are in an inch, often misunderstood in a commercial as dpi (dot per inch). There is a big difference between the two.
Dot per inch(dpi) - Represents the resolution of some printers and print output devices. Dot is not like pixel, there is no change of color depth, only exist or does not exist, that is printed material (such as paper) on a little or no point. The output of a general inkjet printer is a dot, and the output of a digital photo printer is a pixel. So 200ppi output quality is better than 200dpi or even 1000dpi output. Reference URL:
Http://(electronic clippings)
Http://~jweise/quality/NetworkedImagesTOC.html (University of Michigan, USA)
Books: Understanding Desktop Color Michael Kieran Peachpit Press