The two issues of resolution and size are almost more confusing than anything else related to scanning and input. What is the role of resolution in digital images? What kind of input resolution should I use when scanning original drawings? How high resolution is enough to ensure high quality output and what kind of resolution is not too high? When is it best to resize the image and what method is best to resize the image? What is the resolution? and many more.
What is resolution?
If various terms in the field of digital imaging are regarded as actors, then in terms of versatility, "resolution" can win an Oscar. Regardless of the "dressing" and "character" of resolution, one of its most basic facts is that it is always used to describe the amount or density of digital information, so any discussion about resolution is inseparable from the pixel and net. The relationship between grid characteristics, and the pixel and grid are the basic components of the raster device for the scanning device or output device. Now let's discuss the properties of pixels by placing the resolution in the digital imaging environment.
The original grayscale or color photo has a continuous hue, that is, a smooth transition between adjacent colors or shadows, but the computer can not understand any continuous thing, the information is divided into individual units that can be processed, pixels The (graphical element) is the smallest unit that can be used to measure image data. The complexity of reproducing all digital images is to use these separate, discrete small elements to simulate continuous tones. Each pixel in a raster image has four basic characteristics: size, hue, color depth, and position. These four attributes all help define the resolution from different perspectives.
All pixels in the same image are the same size. Initially, the size of the pixel is determined by the resolution used when the image is scanned, i.e., when the image is captured digitally. For example, a 600 ppi scanning resolution means that each pixel is only six hundredths of an inch. The higher the input resolution, the smaller the pixels, which means that each metric unit has more information and potential details, and the hue looks more continuous; the lower the resolution, the larger the pixel. The smaller the detail of each metric unit, it looks somewhat rough. The combination of pixel size and number in an image determines the total amount of information it contains. At any time during the production process, the pixel size can be changed by simply changing the resolution. If your output is used for printing, then changing the resolution automatically changes the size of the print.
Color or tone
A film or filmless camera assigns a color or grayscale value to each pixel in the image. When the pixels are small and the color or tone of the adjacent pixel changes little, it creates an illusion of continuous tone. . Images scanned using a device with a low noise figure and wide dynamic range exhibit a very natural continuous tone because they include a particularly wide tonal range from light to dark. Tip: The detail in the image is a function of the pixel size and tonal range, the pixel size is directly related to the resolution, and the tonal range is determined by the dynamic range of the scanning device.
A single pixel can only give it a value, and it is the bit depth or color depth of the digitizer that determines how many potential colors or shades can be assigned. Although each additional bit can increase the smoothness of the transition between adjacent colors and shades, it requires more file storage space.
A raster image is simply a grid of many individual pixels, each of which has a definable horizontal and vertical position within the grid. In most major image editing programs, the coordinate position of any pixel can be obtained by moving a tool called Eyedropper on the graph. The physical size of the grid is determined by the total number of pixels and the resolution, which in turn determines the relative position of each pixel.
Design Source: Wenzhou Design