Canon ImageRUNNER 2830 Facsimile Manual page 79

To change the document size from the pop-up screen that appears while the
machine is scanning, press [Document Size] ➞ select the document's size ➞
press [OK].
2
To change the resolution, density, and image quality of the document while the
machine is scanning, press [Resolution/Density/Image Quality] on the pop-up
screen that appears while the machine is scanning ➞ specify each setting ➞
press [Done].
Scanning starts, and the documents are sent from memory.
The display returns to the Fax Basic Features screen after scanning is complete.
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Sending Methods