Ali’s Thumb-in-post plugin allows you to include some fancy tag+info and the GD library to create thumbnails for a picture, when the thumbnails does not already exist.
<thumb>fullsizeimage.jpg?cap=This is a caption.</thumb>
in your post will create a thumbnail of fullsizeimage.jpg complete with the caption “This is a caption”.
It resizes gifs, jpegs and pngs, as it uses GD (GD’s resizing looks kind of ugly at times, I should say). I do not know if lets you decide the size of the resized image.
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