If you scan your inked cartoon and save it as a TIF, the scanned image is white to the edges, obscuring anything on the layers beneath. We need a method that will let us isolate the cartoon lines and place them on any background we choose. We could change the blending mode of the image layer to Multiply in order to let the lower layers show through the white, but deleting the white altogether allows us maximum freedom to manipulate the cartoon and extend our options for the final image.
Additionally, this workflow allows us to color the outlines of our cartoon to match the adjacent areas of color rather than being limited to just black outlines. I’ve included an example at right, where most of the outlines are a gradient of orange and red. Note the black outlines that I’ve left around the eyes.
Open your high resolution cartoon TIF and go to the Channels palette. You will see a single composite RGB channel and each of the Red, Green and Blue channels broken out into layers. Drag any one of the Red, Green or Blue channels to the new channel icon at the bottom of the palette to create a copy or Alpha Channel.
Switch back to the Layers palette and make a new, empty layer by clicking on the icon at the bottom of the Layers palette. Then from the Select menu > Load Selection… . This will bring up a dialog box with a pull-down menu for our Source/Channel. Pull this menu down and select the new channel that you made earlier. In the same dialog box under Operation, make sure that the radio button for New Selection is pressed. Hit OK.
Back in the Layers palette in the new layer, you will see the ‘marching ants’ indicating an active selection. (If the marching ants are marching around the edges of your file window, your cartoon lines are not selected and you’ll need to go to menu Select > Inverse.)
Once you’ve made sure the marchin
g ants indicate the outline of your cartoon, fill the selection with black. Now you should see just the lines of your cartoon with no white fill inside or out, and the checkerboard pattern, indicating transparent areas, should be visible behind the lines.
*If you are going to use color outlines, as shown in the bird’s head example at the beginning of this post, you’ll need to lock the transparency of the line art layer at this point.
Now that we have the line art isolated, we have no use for the black and white scanned layer anymore. Double click that layer to change it’s name to something other than Background which will unlock it and allow you to delete it.
Finishing your cartoon is now just a matter of creating a new layer to hold the color. Background elements can be placed on additional layers as needed and pulled to the bottom of the layers stack in the palette.