The bleed is the part on the side of an image that gives the printer a small amount of space to account for movement of the paper.
This command applies to selected images. You can perform it in the menu Instruments → Bleed… [⇧⌘B] or in the toolbar with the icon .
With the menu command Instruments → Bleed… [⇧⌘B] or the tool in the toolbar, you get the following dialog:
Tip: clicking on the icon with the option [⌥] key pressed, the dialog is bypassed and last used parameters will be applied.
Trim marks, optionally placed on each corner of the image, are the classic ones. If you want to use the Fotoba® DIGITRIM marks, please refer to Fotoba® DIGITRIM topic.
Note: during this operation the asymmetric scale is necessarily activated for the images involved. To reset the scale to symmetric (loosing the bleed resize!) it is sufficient to click the icon / in the info panel.