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This controls what happens when you click the image in a preview. "imagepage" takes you to the image page (and will generate a subpopup when you hover over the image), unless the popup is generated for the image page; "sizetoggle" means the image size is toggled on click, and "linkfull" means that the image links directly to the full size version.
See Wikipedia:Alternative text for images for discussion of appropriate alt text. Internet Explorer displays the link title as a tooltip but other browsers may not. [needs update] Hint: to force the caption to be written (underneath the picture) and not just appear as "hover text" even when you wish to resize the image, specify "thumb".
Cropping is the removal of unwanted outer areas from a photographic or illustrated image. The process usually consists of the removal of some of the peripheral areas of an image to remove extraneous visual data from the picture, improve its framing, change the aspect ratio, or accentuate or isolate the subject matter from its background.