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Originally Posted by Stephen Fox
Edit: The CRT screen image is a challenge to JPEG compression as many edges and rapid spacial changes. I think a reallife JPEG from 20D would produce a filesize much lower.
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Yes reallife 20D fine JPEGs are more like 2-4Mb dependent on subject detail.
A little known fact about compression is that with some compression methods it is possible to end up with a bigger file than the original if fed with very rapidly changing information.
You have to remember jpeg in fact uses two forms of compression. A degree of Filtering that throws away image information based on your jpeg encoder setting. After Filtering Huffman compression is then used. Huffman is a lossless compression method.