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Web Design TIPS:

 

Formats of Web Graphics
Graphics used on the Web can be broadly divided into two types, bitmaps and vector graphics.
                                   
Bitmaps
Bitmaps are images that are stored in the form of pixels or dots. Each picture can comprise millions of such pixels. In case of bitmaps, each pixel can be manipu­lated separately. You can manipulate pixels by changing their colors or deleting them. Some of the supported formats for Web graphics are BMP, PSD, TIFF, JPG, GIF, and PNG.

Vector Graphics
Vector graphics are complex images in which pixel level manipulation is not pos­sible. Mostly these types of graphics are used for creating line art and illustrations. A major disadvantage in using vector graphics is that you cannot use these images directly on the Web. You need to first convert them to bitmap format and then use them. Some of the commonly supported vector graphic formats are EPS, WMF, and AI.

 

Commonly Used Graphic Formats
From all the bitmap formats mentioned previously, there are only three formats that are most commonly used to store graphics that you can use in your Web page. These formats are GIF, JPG, and PNG. PNG is the most recent addition to the list due to the compact and light files. Let's discuss each of these formats separately.

• Graphic Interchange Format (GIF): The GIF format is the most com­monly used format for graphic images used in Web pages. The format supports a maximum of 256 colors and an 8-bit compression. Mostly all images that are used as logos and banners on the Web are stored in GIF format. Most of the images stored in GIF format use solid colors. You can also save animated images, integrated images, and transparencies in GIF format. Animated images are multiple images that run in a sequence and are browser-independent. Therefore, the image appeals, to be in continuous movement. Integrated images are a boon for people with slow Internet access, because in this case the image appears in lay­ers. You can also create a GIF image that has one color as the back­ground and is set as transparent. Since most graphics comprise basic shapes such as ellipses, squares, and rectangles, the use of transparencies offers an excellent opportunity for creating complex images.

 

• Joint Photographic Experts Group (JPEG): This is another commonly used format, which is used for saving images of very high quality. JPEG images use 24-bit compression and support 16 million colors. Generally, all complex images such as photographs and drawings are saved in JPEG format. The earlier JPG formats did not support transparency. However, new versions are being developed that support transparency. Although these versions might support transparency, these graphic images would not be compatible with the earlier versions of Web browsers.  

• Portable Network Graphics (PNG): The PNG format is the latest addition to the list of acceptable graphic image formats. The popularity of this format can be attributed to its support of all the bit formats, such as 8-bit, 24-bit, and 32-bit. Currently, a major drawback in using PNG format graphic files is that these images are not supported by the earlier versions of Web browsers.

 

Now that you know about the different types of formats in which you can save Web graphics, let's discuss how images can be used in PHP.