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I'm trying to convert some BMP files into JPEG format at highest quality (Q = 100) until I realize there is a "Progressive" option here.
One of my BMP file is 2.9MB. After converting to JPEG format without progressive the new file size is 338.2KB and with progressive the new file size gets down to 283.2KB only.
I have read Wikipedia article about what this progressive JPEG is for, but my concern is comparing to normal JPEG, the quality of progressive JPEG get worse or they will be the same?
I doubt the quality efficiency is a concern, but let me add to the web-loading issue: While progressive is fine for tiny images that are part of the design, such as various skins, frames and backgrounds, it is wrong for payload images such as large photos. There is a way to optimize the user experience better with standard top-to-bottom loading leveraging the fact that the thumbnails are already in the browser's cache: The website design stretches the cached thumbnail behind the image being loaded. This is much quicker and nicer than the jagged result of the progressive JPEG. – Zdenek – 2015-12-29T09:12:45.850