8/10/2023 0 Comments Kb compression calculatorI distinctly remember that Mandrill image from my Amiga days. * An entire set of classic reference images is available from the USC-SIPI image database. There's virtually no effect at all on file size, which stays constant at 30-31 kilobytes even through generation 15. By generation five, you can see a few artifacts emerge in the image, and by generation ten, you're definitely in trouble. I was quite surprised to find that there's very little visual penalty for recompressing a JPEG once, twice, or even three times. For each new generation, I opened and saved the previous generation with my standard JPEG compression factor of 15. I've been forced to do this when I couldn't find an uncompressed or high quality version of the image I needed, and I always wondered how much worse it made the image when I recompressed it.įor the recompression test, I started with the uncompressed, resized 384x384 Lena reference image. That is, opening a JPEG and re-saving it as a JPEG, including all the artifacts from the original compressed image in the recompression. I was also curious what the image quality and file size penalty was for recompressing a JPEG image. Here's a more complete breakdown of JPEG compression factor and file size for the 384x384 Lena image: The original, uncompressed image size is 433 kilobytes.īeyond 50 percent compression factor, quality falls off a cliff, so I won't bother displaying anything higher. Note that I resized the image slightly (from 512x512 to 384x384) to keep the file sizes relatively small. Combustion Chamber Volume/cylinder head volume: Total volume of the area from the piston dome at TDC inside the cylinder head. So I performed a JPEG compression series using the Lena reference image*. Head Gasket Specs: How thick the head gasket will be once compression, as well as the bore of the gasket. Over the years, I've standardized on a JPEG compression factor of 15 I find that generally provides the best compromise between image quality and file size for most photographic images.Īlthough I've done some ad-hoc testing that pointed to compression factor 15 as the sweet spot before, I've never done a formal test. A Comparison of JPEG Compression Levels and Recompression He did say determining compression ratio will help him make a better 243 KB KB243-040 Keith Black KB Performance Pistons Summit Racing racers tool.
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