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Are you talking about the automatic resizes created when you upload an image to a picture library. Typically it will create an 160px max and 640px max and put them in the _t and _w folders of the library respectively. When this is done the resizes are always jpgs. When browsing from a picture library if you click on the thumbnail, then the resize, then it ...

SharePoint automatically creates two JPG images every time you upload image to a Picture Library: they are thumbnail image and web preview image. They're stored along with the original image in the Picture library. No in-place conversion happens: the image is converted only once during the initial upload process. SharePoint needs these extra images to ...

It seems that SharePoint stores the data internally this way, and if you change a field type, nothing actually happens with the data itself, and the only thing which changes is the Type property. I've been fiddling around this for some time, unfortunately with no lack. For example, changing field type to "Integer" will cause nulling all the "big" values ...