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I've done a scan of a portrait by Sharon Knettell and it's file size after the scan is 469.8 kb and the dimensions are 1437 pixels wide by 2371 high. Too big, of course to post on the Forum. Now I'm going to size it down. To size down your image, click Image | Image size. Enter 400 pixels for the width. If your height is now greater than 600 pixels, enter 600 in the height. Now I'll save my file as a jpg file. When the option for jpg quality comes up, I select level 10. There is nothing sacred about this size, but it does maintain good quality with no worries about pixelation.
I had no problems getting my image within the 100 kb limit with the regular save, but I know some have had difficulty with this. Perhaps it's due to the dpi at which you scanned. The problem was resolved by using File | Save for Web.
You might be using a digital camera instead of a scan. You can simply apply the same principles.
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