The next data structure in a GIF file is the Global Color Table. A six byte Logic Screen Descriptor follows, specifying the dimensions of the image, number of colors used, and other flags. GIF are composed of a six byte header, identifying the file format and version.
#Gifsicle opitmiztion how to
To understand how to optimize GIF images, we need to first explore the structure of the image format to identify which areas can be streamlined or optimized. Due to their prevalence, understanding how to structure optimize GIF images is an important part of understanding. According to the HTTP Archive, 33% of all images on the web use the GIF format. GIFs feature the ability to contain multiple graphic images inside of a single fileĭue to their age, simple nature, and a widespread support, GIFs are widely present on the Internet. This means a pixel of the image can be completely transparency, showing the background behind the image, or completely opaque, showing the color value for that pixel. GIF images also support binary transparency. GIF is a palette based image format, allowing an image to contain up to 256 distinct colors defined from a possible 16,000,0000 colors (2^24). This makes GIF the oldest image format in common use on the web today. GIF is a lossless image format created by CompuServe in the late 1987. To do this, we start by exploring the GIF image format and how to optimize it. Understand images and how to optimize them are skills for any frontend performance advocate. Of that, 601kB, or 62% of the total amount, is image content. According to the HTTP Archive, the total size of an average web page and its supporting content is 968kB. Images make of the majority of content on the web. Now let’s shift our attention from text content to images. In our last post, we talked about using HTTP compression to reduce the size of the data that needs to be sent to the client, as well as the challenges that are involved. As we have mentioned, a great way to lose the wait is to lose the weight, as in the weight of your page content. Our Lose the Wait series is all about improving the performance of your web applications.
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