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The Three Principles of Image Optimization - Free Web Templates @ Template Hunter

The Three Principles of Image Optimization


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The Three Principles of Image Optimization
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The Three Principles of Image Optimization
Speeding up image load times

Are you losing visitors to your web site due to slow page load times? Is your site being penalized because the images on your site are too large? Are you able to capture your visitor’s attention in the first 10-15 seconds that they are on your site?

All of these problems can be caused by an improperly optimized web page. In other words, the page loads too slowly and your visitor leaves before you have had a chance to hook them.

Optimizing a page for quick load times can be broken down into 3 broad categories: the basic coding of the page, scripts that are used on the page, and images. Of these three, images that are too large can have the most significant impact on load times and therefore have the greatest potential for improved page loading times if properly optimized.

A brief primer on image types

There are many image formats in common use on web sites, the three most popular being GIF, JPEG, and to a lesser extent Flash content. We will be limiting our discussion to GIF and JPEG images, with a specific focus on still images.

Each of these image formats has their strengths and weaknesses. GIF or Graphics Interchange Format was developed by CompuServe before the Internet boom as a way to share images on the CompuServe service. Due to limitations with screen resolutions and color depths at the time, GIF images were limited to showing up to 256 colors, more colors were imitated by Dithering, a process of fooling the eye into seeing one color by using 2 or more sets of color dots spaced too closely for the eye to distinguish separately.

Imagine a chessboard with black and white squares. When viewed closely we can distinctly see the individual squares, but if we back off far enough we will no longer be able to discern the individual squares and instead we will see one large grey square, the black and white squares merging together in our eyes to form one solid color. This is the concept behind dithering.

The JPEG file format on the other hand is a newer format that can handle millions of colors easily. The initial drawback to JPEG images is that they do contain many more colors, and each color requires some coding for display, making the file size larger.



 
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