What is a digital image
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
With the continuous development and application of digital technology, much of the information in real life can be processed and stored in digital form. Digital images are such images that are stored and processed in digital form. It can be processed by a computer with a common image processing technology, and it can be transmitted on the Internet, and can be copied multiple times without distortion.
First, the method of obtaining images
Many images with images use analog images such as 35mm slides, transmissive sheets or reflective sheets. To obtain a digital image, the pixels in the image must be converted to digital information for processing and processing on a computer. The work of converting an analog image into a digital image can usually be done by a scanner. The scanner measures the light emitted or reflected from the picture, sequentially records the value of the spot and produces a digital copy of the color or black and white. The image is translated into a series of numbers and stored on a computer's hard drive or other electronic medium, such as a removable hard drive, a graphics CD or a recording tape. Once an image is converted to a digital file, it can be electronically transferred from one computer to another.
Terms to understand
Analog image - a piece of data stored in a continuous form. A photo taken with a conventional camera at the seaside is an analog image.
Digital image-data processed with binary numbers (such as on and off), such as digital photos taken with a digital camera.
Scanner - A digital input device that produces a copy of a bitmap for electronic processing.
Second, the design planning digital method
A wide range of software can support digital image processing, such as generating digital graphics, modifying digital images, performing technical processing such as page design, and combining some pixels into one image.
Images produced by applying these software are grouped into two broad categories, vector graphics and bitmap images.
Vector graphics are often used for line drawing, marking statement drawing and any image that needs a smooth transition edge. One of the advantages of vector graphics is that they can be arbitrarily enlarged and reduced without losing detail and clarity, and without distortion.
A bitmap image is typically an image such as a picture or photo, such as an image obtained with a scanner. The bitmap image uses the software in the scanner to "map" the information of the picture to the corresponding space in the virtual graphics grid, and the color pixels fill each of the cells, thereby composing the entire image. Unlike vector graphics, bitmap images cannot be arbitrarily magnified without very good image quality. As the image expands, the pixel grid size increases accordingly, and the sharpness decreases. Therefore, in order to obtain sufficient image detail, it is important to select the size of the scanned bitmap image. Bitmap image files are usually much larger than vector graphics files because more information is needed to reproduce the image.
Graphic image file format used to describe the many, two of the most widely used is TIFF (Tagged Image File Format) format and EPS (Ecapsulated Postscript) format. TIFF is a commonly used bitmap image format, while vector graphics are similar to EPS files. Different types of graphic image files can be combined and designed and typeset in a common file format.
After the design layout is completed, all the pixels are concentrated in one file, which can contain vector graphics and bitmap images stored in different file formats. This file can be converted to a raster graphics format file (a bitmap form) required by the output device. The size of the raster in the output device is fixed and depends on the resolution of the output device. At this point all the pixels in the file, regardless of the original format, will be bitmapped so that the output device can reproduce the image.
Terms to understand
Vector graphics - a graphics file that can be scaled without loss of detail.
Bitmap image - An image file stored in pixel or dot format.
Raster Image Processor - A device that combines hardware and software to convert a graphics file into a series of points of data required for output.
Resolution - also known as resolution, the number of pixels per unit length, commonly used in dpi (pixels / inch).
Third, the method of digital image reproduction
Digital images can be produced on a wide-format output device using different technologies, among which liquid inkjet technology, electrostatic technology, solid inkjet technology, thermal conversion technology, and photographic technology are the main technologies used today.
Here are a few general introductions to several technologies:
Inkjet technology
The ink is forced to drip onto the medium on which the image is to be produced by applying pressure as needed.
Continuity - The ink continuously forms a jet of ink droplets under pressure, which is ejected onto the medium on which the image is to be formed.
Thermal effect - Bubbles are created at the nozzle opening, and the pressure of the bubble pushes the droplet onto the medium.
Solid ink - The ink is stored in solid form, melted as needed, and printed on the media by a method similar to liquid ink jetting.
Thermal wax or heat sensitive resin conversion technology
Wax or resin is used for the film carrier, usually in the form of a roller. The wax or resin is transferred to the medium by heating, and each color must be transferred separately.
Dye sublimation technology
Similar to the thermal conversion technique, when the controlled heat source heats up, the thermal sublimation dye is evaporated from the carrier roll onto the medium.
Electrostatic technology
Special media has an electrostatically charged image that electrostatically attracts colored particles to form a color image. A typical electrostatic printer produces images that are separate for each color.
Atomization sputtering
The separately placed color ink is directly sprayed onto the medium through the nozzle.
Digital images can be applied to paper media, vinyl film media, fiber fabrics, plastics and many other materials, and the most suitable output devices and media can be selected as needed.
Fourth, post processing
Images that are imaged using special media, ink or roll can withstand the effects of changes in the sun and everyday weather conditions. Similarly, stickers also provide an opportunity for digital images to be applied to the surface of the seed. You can see digital images on any decorative surface such as buses, airplanes, buildings, ceramics, knits, and more.
Digital image technology is changing the way we work with images, and it has many advantages:
When it enters the visual information exchange, the digital image changes the original habit. A few years ago, cost, color, format, and printing cycle were the four major challenges faced by large format image demanders. Now digital technology has successfully entered the role, making the production of large format images more convenient and practical than ever.
Here's how digital image technology breaks through these four challenges:
Cost—The cost of digital proofing or pre-printing is significantly lower than traditional proofing, making the price of short-run and single-shot proofs for full-color images within acceptable limits.
Color – For many projects, traditional proofing is too expensive, and digital images are a color processing process that eliminates expensive proofing steps.
Dimensions - Digital image technology can actually handle any size of image. Existing output devices can range from a few inches to more than 60 feet. For larger images, you can use a piece-by-piece approach.
Printing cycle - Digital image processing is an automated process that can quickly operate and change images, using digital image technology not only to get instant, but also to modify image content and text information separately.