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When saving a image for web and devices as JPEG, I can either choose progressive or optimized (or none). What is the difference between both and what should I use ? In my case, the image is the background image or a website (20KB).

On mouse-over, it says:

Progressive: Download in multiple passes

Optimized: Creaets smaller but less compatible files

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I know what progressive is visually. When those pictures load in all blurred up and low-res, then clear up eventually. It is sort of Layered pics in the file. This requires the file size to be a bit larger, the graphics have to re-refresh / re-drawn, and the Viewer gets to see some useless mudded up image FAST , instead of nothing . msdn.microsoft.com/en-us/library/windows/desktop/… Except in very specific instances like massive pictures , or horrible connection speeds, IMO it is usually a waste :-) of data time and effort, for little. – Psycogeek Jan 17 at 14:13
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@Psycogeek Progressive should help with browsing a large number of large(ish) files in Windows' image viewer, since you get a rough outline of the image much more quickly than having to wait for it to finish. Although the web/devices image sizes will hardly make a difference here. – Daniel Beck Jan 17 at 14:21
@DanielBeck Yes should, Thumbs Fast. also the different picture types use methods that dont require more data, just more work to refresh it again. I donno no mater how bad my connection, and speed of like a portable device, I have never wanted to see pixelated mud , I just want them to "get on with it" and get to the real thing. – Psycogeek Jan 17 at 14:32
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