That's problematic at larger sizes of this unit because the difference increases: Name and manufacturers of hard disk drives use the new one because their drive's file-size appears to be bigger. Generally the tendency is to use a system that makes the product appear better.įor this reason JPGMini uses the deprecated mode of calculation. Since 1998 the correct way to declare that way to calculate would be with "KiB".ĬOD uses the correct mode of calculation (1000 bytes corresponds to a kB) and displays 2,350 kB for the same file.ĭepending on your operating system or your program you will see either one or the other value. The well known tool JPGMini uses the deprecated mode of calculation (1024 bytes corresponds to a kB) and displays 2,295 kB. It gets really interesting when you try to gain the biggest savings at very low qualities.īefore we start I want to mention something you should take into account if you compare file sizes.Īssume you've got a JPG from tool XY and the file has 2,350,195 bytes.ĭepending on the tool you will get different sizes displayed in kB ( ). In this case you could use nearly every tool to compress your images. Of course you can also use COD for large photographies (2,000px x 2,000px and bigger), but at very large sizes it is often not important to save 20 or 30 kB. Therefrom it should be clear how the file-size reduction tricks explained at the end of the article work.įurthermore it should be clear to you why compression tools without settings can only achieve a fraction of the possible file-size reduction.īy the way COD was created to increase maneuverability in digital advertising banners which usually have size-limits somewhere below 200 kB. For example I will presume that a color image has an 8 bit resolution, although the JPG format supports other resolutions.Īfter reading this article you should understand the functionality of the JPG algorithm. To make this possible I will overly simplify some aspects for the purpose of answering questions adequately if not perfectly correctly. On the other hand there are so many incorrect statements about the JPG format out there and therefore so many wrong tool comparisons, that it is simply important to me to clear up misconceptions with an explanation that is reasonable for every level of understanding. ![]() It is in my opinion THE tool to create JPGs with the best file-size/quality ratio. On the one hand I want to push my little baby (that I will call COD in the rest of the article). I am writing this article for multiple reasons. ![]() English version | Deutsche Version | Spanish Version
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