A cel (from celluloid) is one image in a specific frame and layer, at a specific xy-coordinate in the canvas.

Cel on Timeline

The difference between a frame and a cel, is that a frame is the set of cels for all layers in a specific time:

Frame on Timeline

Move a Cel

You can use the Move tool to drag-and-drop the current cel in the canvas. Or you can use the Timeline to move the cel to other layer/frame position.

Change Opacity

On RGB images each cel has its own opacity level. You can use the slider at the status bar to modify its opacity:

Cel Opacity

You can do the same right-clicking a cel and selecting Properties option (or Frame > Cel Properties menu):

Cel Properties


Linked Cels | Timeline