This smaller image size reduces the file size by a factor of two! JPEG format, 200x168 pixels, 60% compression, 9 kilobytes JPEG format, 200x168 pixels, 40% compression, 12 kilobytes For example, here's the same image in a 200x168 format: Forty- or 50-percent compression is probably a good value for this image, with an image size of 20 to 25 kilobytes.Īnother way to lower the size of the file is to reduce the image size. Eighty-percent and 90-percent compression is progressively worse, and 95-percent compression is badly pixelated. When I look at this particular image, I can begin to see minor degradation at 60-percent compression (most visible on the border of the blue shirt). JPEG format, 400x336 pixels, 95% compression, 4 kilobytes JPEG format, 400x336 pixels, 90% compression, 7 kilobytes JPEG format, 400x336 pixels, 80% compression, 12 kilobytes JPEG format, 400x336 pixels, 60% compression, 19 kilobytes JPEG format, 400x336 pixels, 40% compression, 25 kilobytes Besides, there is no difference between 1-percent compression and 20-percent compression in terms of image quality, even though the size of the file goes down by a factor of four! The original JPEG image at 1-percent compression (maximum quality) takes up 152 kilobytes of disk space, so it is not even included. In all cases, I started with the same 400x336-pixel image. The following images give you some sense of the effect that different compression ratios can have on image quality. #Make picture smaller proFor example, Paint Shop Pro lets you adjust the compression ratio on a scale from 1 to 99, with 1 offering the best image quality and lowest compression ratio and 99 offering the lowest quality and highest compression. Most image-handling programs let you tweak the JPEG compression ratio in one way or another. Sites like BBCi and CNN.com adjust the compression ratio to shrink the file size. It lets you adjust the amount of compression.It has good compression characteristics on photographic data.
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