![]() ![]() On the Web, you will be working at “screen resolution.” These days, screen resolution is roughly 96-100ppi (pixels per inch). To understand how this process works, one needs to think about how big the files will be for Web pages. If you want your Web pages to load quickly, file compression is of the utmost importance. JPEG also supports 32-Bit files as (CMYK) and 8-Bit grayscale files. ![]() It is an excellent format for reducing the size of your images it also stores image data as a 24-Bit format. The JPEG format is used for still images. The acronym JPEG (Joint Photographic Experts Group) describes a 24-Bit file format designed for compressing photographs, photo-realistic artwork and grayscale images. These most popular formats are JPEG, GIF and PNG. In the next section, we look at the different formats available to you when compressing files for the Web. As an example, an image with a clear blue sky will compress more than an image filled multiple textures and patterns. An image with large areas of similar colors will compress more than a complicated image where there are plenty of colors and many transitions. To make sure you get the best results, here are a few things to consider: The final compressed file will depend on the subject matter in the original image. On the Web, it is important to reduce images to as small a size as possible while retaining the quality of the original. This will reduce or eliminate the above issues. When using bitmaps for the Web, it is best to use images at the same size at creation or to reduce them. This means that the pixels will become more obvious as the image is enlarged. The image above has been magnified by 1200%. This works well, but when you zoom into an image it will begin to look ragged. Each pixel contains a color, which, when viewed at a distance, creates an image. When you look at a bitmap (aka a raster image) under extreme magnification, you will see that it consists of rows and columns of pixels. In the last part of this series, you will learn how to use image slicing if your web images are too large to load all at once. In this series, you will learn how bitmaps work, when to use JPEG, GIF, and PNG formats and how to create web page graphics that load quickly. You have roughly 10 seconds for your web page to load otherwise you run the risk of losing your audience. The down side is these graphics can also be the source of many issues. Web graphics can increase your pageviews and generate a lot of interest. ![]()
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