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If you put photos from a digital camera on your web site, you should consider removing the exif layer.
The camera records the shutter speed, "film" speed, and other useful data in there. Newer models tend to have orientation sensors, and record whether the photo is in landscape or portrait mode; sideways or normal. Lots of good stuff in there. But there's also a thumbnail image that can take up to 30 KB; when you review the picture on the back of the camera, it loads this one until you zoom in, to avoid reading the whole file and be faster.
Photoshop 6+ preserves the exif layer, depending on what you do with a photo. 7 and up keep the info pretty much no matter what you do, and starting with CS even files that started in raw mode will have the exif layer. So, if you want your images around 100 KB, you've got an extra 20 to 30 % file size that's not doing anything for you. And if you have galleries, or other reasons to use thumbnail images, you probably want those to be 10 to 15 KB, but you get a minimum of 20 extra KB. Most versions strip this out when you use the Save for Web command, but if you just Save or Save As, you can lighten your files a bit with no visible change.
So, in general, you should use Save for Web, or if not, download exifer, written by a German as "postcard-ware." I learned the hard way back when bandwidth used to actually cost something, but nowadays your visitors still enjoy faster load times, even on cable or T1 or DS3 connections.
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