As for this photo, he is still called a picture or a photo.
There are the following formats:
I. BMP format
BMP is the abbreviation of English Bitmap, which is the standard image file format in Windows operating system and can be supported by many Windows applications. With the popularization of Windows operating system and the development of rich Windows applications, BMP bitmap format is logical.
However, it is widely used. This format is characterized by rich image information and almost no compression, but this leads to its inherent defect-occupying too much disk space. So BMP is popular on stand-alone computers at present.
Second, the GIF format
GIF is the abbreviation of English graphic interchange format. As the name implies, this format is used to exchange pictures. Actually, it's the same. In 1980s, CompuServe, a famous online information service organization in America, aimed at the network at that time.
Due to the limitation of transmission bandwidth, this GIF image format was developed.
GIF format is characterized by high compression ratio and less disk space, so this image format has been widely used soon. At first, GIF was only used to store a single still image (called GIF87a). Later, with the development of technology, multiple still images can be stored at the same time.
The image then formed a continuous animation, making it one of the few formats that supported 2D animation at that time (called GIF89a). In the GIF89a image, you can specify a transparent area, which makes the image have an extraordinary display effect and makes GIF full of scenery. At present, the Internet is very large.
Most color animation files used in the volume are files in this format, also known as GIF89a format files.
In addition, considering the actual situation in network transmission, the GIF image format also adds a progressive display mode, that is, in the process of image transmission, users can first see the general outline of the image, and then gradually see the details of the image as the transmission process continues to adapt.
Respond to the user's viewing psychology from hazy to clear. At present, a large number of color animation files used on the Internet are mostly files in this format.
However, GIF has a small disadvantage, that is, it can't store pictures with more than 256 colors. Nevertheless, this format is still widely used on the Internet, which is inseparable from the advantages of short GIF image files, fast download speed and animation composed of many image files of the same size.
Yes
Third, JPEG format.
JPEG is also a common image format, which was developed by the Joint Photographic Expert Group and named ISO/KOOC-0/09/KOOC-0/8-/KOOC-0/. JPEG is just a common name. The extension of JPEG files is. Jpg or. Jpeg, and its compression technology is very good.
Advanced, it uses lossy compression to remove redundant image and color data, and can display very rich and vivid images at the same time, in other words, it can get better image quality with the least disk space.
At the same time, JPEG is a very flexible format, which has the function of adjusting the image quality, allowing you to compress this file with different compression ratios. For example, we can compress the BMP bitmap file of 1.37MB to 20.3KB at most. Of course, we can completely improve the image quality and file size.
Find the balance between inches.
JPEG is widely used because of its excellent quality and performance, especially on the Internet and CD-ROM. At present, all kinds of browsers support JPEG as the image format, because the file size of JPEG format is small and the download speed is fast.
It makes it possible for web pages to provide a large number of beautiful pictures in a short download time, and JPEG has naturally become the most popular picture format on the network.
Fourthly, JPEG2000 format.
JPEG 2000 is also formulated by JPEG organization, and its official name is ISO 15444. Compared with JPEG, JPEG 2000 has higher compression rate and is a new generation of still image compression technology with more new functions.
As an upgraded version of JPEG, JPEG2000 has a compression ratio about 30% higher than JPEG. Unlike JPEG, JPEG2000 supports both lossy and lossless compression, while JPEG can only support lossy compression. Lossless compression is very useful for saving some important pictures. JPEG2000
An extremely important feature of GIF is that it can realize progressive transmission, which is similar to the progressive display of GIF, that is, the outline of the image is transmitted first, and then the data is transmitted step by step, so as to continuously improve the image quality and make the image display from hazy to clear, instead of JPEG as it is now.
Similarly, slowly show it from top to bottom.
In addition, JPEG2000 also supports the so-called region of interest function. You can arbitrarily specify the compression quality of your region of interest on the image, or you can choose the specified part to decompress first. Compared with JPEG, JPEG 2000 has obvious advantages and backward compatibility, so it replaces the traditional JPE.
G format is just around the corner.
JPEG2000 can be applied to the traditional JPEG market, such as scanners, digital cameras, and other emerging fields, such as network transmission and wireless communication.
Verb (abbreviation of verb) TIFF format
TIFF (Tag Image File Format) is a widely used image format in Mac. Developed jointly by Aldus and Microsoft, it was originally designed for cross-platform storage of scanned images. It is characterized by complex image format and much information stored. Because it stores charts.
There is a lot of information like subtle levels, and the quality of images has also improved, so it is very beneficial to copy manuscripts.
There are two forms of this format: compressed and uncompressed, in which compressed can be stored as LZW lossless compression scheme. However, due to the complex structure and poor compatibility of TIFF format, sometimes your software may not correctly identify TIFF files (most of the software has solved it now).
This question). At present, it is also very convenient to transplant TIFF files on Mac and PC, so TIFF is now one of the most widely used image file formats on microcomputers. PSD format of intransitive verbs
This is a Photoshop document (PSD), which is a special format of Photoshop, the image processing software of the famous Adobe company. PSD is actually a draft of Photoshop graphic design, which contains various design samples such as layers, channels and masks, so as to facilitate.
You can modify the final design the next time you open the file. Among the various image formats supported by Photoshop, PSD has much faster access speed and more powerful functions than other formats. Because Photoshop is more and more widely used, we have reason to believe this grid.
Types will gradually become popular.
Seven. PNG format
PNG (Portable Network Graphics) is a new network image format. At the end of 1994, because Unysis announced that GIF had a patented compression method, the author of GIF software was required to pay a certain fee, thus promoting the birth of free png image format.
Healthy. PNG combines the advantages of GIF and JPG from the beginning, and intends to replace these two formats in one fell swoop. 1 996 65438+1October1was proposed by PNG to the international network alliance and was recommended and recognized. Most drawing software and browsers began to support PNG image browsing. From then on, PNG image grid.
Type a is full of energy.
PNG is the most undistorted format at present, which absorbs the advantages of GIF and JPG, has rich storage forms and has two color modes of GIF and JPG. Another feature of it is that it can compress image files to the maximum extent to facilitate network transmission, but it can keep all images related to image quality.
Information, because PNG uses lossless compression to reduce file size, unlike JPG, which sacrifices image quality for high compression rate; Its third feature is its fast display speed. You can display a low-resolution preview by downloading 1/64 image information.
Like; Fourthly, PNG also supports the production of transparent images, which is very useful when making web images. We can set the image background to be transparent, and replace the transparent color with the color information of the webpage itself, so that the image and the webpage background can blend harmoniously.
Together.
The disadvantage of PNG is that it does not support animation application effects. If it can be strengthened in this respect, it can completely replace GIF and JPEG. The default format of Macromedia's Fireworks software is PNG. Now, more and more softwares are beginning to support this format, and are now
Internet is becoming more and more popular.
Eight. SWF format
With Flash, we can make an animation with the suffix SWF(Shockwave format), which can express rich multimedia forms in a relatively small volume. In terms of image transmission, you don't have to wait until all the files are downloaded before you can watch it, but
It can be downloaded and watched at the same time, so it is especially suitable for network transmission, especially in the case of poor transmission rate, and can achieve better results. Facts have also proved this point. SWF has been widely used in multimedia presentation and interactive design of web pages. In addition, SWF animation
It is made by vector technology, so no matter how many times the picture is enlarged, it will not be damaged. To sum up, SWF format works are favored by more and more web designers because of their high-definition image quality and small size, and are increasingly becoming web animation and
The mainstream of web page picture design and production has become the de facto standard of network animation.
Nine, SVG format
SVG can be regarded as the hottest image file format at present. Its full English name is Scalable Vector Graphics, which means extensible vector graphics. It is based on XML (Extensible Markup Language) and is supported by World Wide Web Consortium (W
3C) Developed by the Alliance. Strictly speaking, it should be an open standard vector graphics language, which allows you to design exciting and high-resolution Web graphics pages. Users can directly describe images with codes, and can open SVG images with any word processing tool.
Modify part of the code to make the image interactive. You can insert HTML at any time and view it through the browser.
It provides the advantages that GIF and JPEG, the popular formats on the Internet, do not have: you can enlarge the graphic display at will, but never at the expense of image quality; Text remains editable and searchable in SVG images; Generally speaking, SVG files are better than JPEG and GIF files.
It's much smaller, so it downloads quickly. It is believed that the development of SVG will provide a new image standard for the Web.