Compressing an image reduces the file size (fewer kilobytes) which makes the image load faster on a Web page. Compression also reduces the quality of an image. The more compression you use, the more likely it is that a viewer will detect a reduction in image quality.
To reduce an image file size, click the ˜Compress Image™ button. You will notice in the lower part of the interface the Quality text box, where you can enter a number between 1 and 99. This number represents the percent of the image initial quality you want to maintain:
The default value of the Quality text box is 80. The image below was reduced to 20 percent of the original quality, resulting in a much smaller image but also a noticeable reduction in visual quality.
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