Canon EOS 10D Software Instructions page 172

Printing Images
●
Changing the image size
You can change size of an image by moving the cursor over the image and dragging
the displayed arrows.
* Depending on the selected print mode, you may not be able to change image size or
angle.
9
Select the printer to be used, specify the print settings and print
images.
●
The [Custom layout printing] radio button in the [Layout Options] dialog box allows
you to freely change the size and position of the images for printing. The other
options allow you to print an index or print onto Canon perforated paper (supported
on OS 9 only).
●
The settings available in step 3 vary depending on type of printing selected in step 2.
M-66
Drag this arrow to change the image size.