Edge sharpening technique - Photoshop
Note: This should be done as a last step in your workflow.
You will also need to flatten your image so make sure you
save it first and then duplicate the window so you're not
working with your original image. Also make sure you've
resized it to the output size you want. Always be looking
at your image at 100% magnification. At the very end you
can zoom in to 200% to see exactly what effect you have
created. Once you have this process down to a fine art,
don't use anything other than the UNSHARP MASK for
sharpening. The other options are simply default settings
of the Unsharp Mask.
For Mac users, replace the
Ctrl with Command.
1. in the layers panel right click on the background and
2. with "background copy" selected change the blend mode
from "normal" to "luminosity"
3. select and copy - Ctrl+A then Ctrl+C
4. select the channel tab (next to layer) and click on the
"create new channel" icon at the bottom of that window.
This will create an alpha channel.
5. paste - Ctrl+v
6. select Filter menu - Stylize - Find edges
7. Use the the levels tool to increase or decrease the area
to be sharpend. Black is more, white is less. you really
only want to sharpen edges so move the black and white
points around until you have very little grey left.. should
be mainly black edges by the end.
8. select menu, load selection. In the box that appears
tick the "invert" tick box then OK.
9. select the layers tab and highlight the duplicate layer
10. Filter menu, Sharpen, Unsharp mask. Use settings of
Amount = 500%, Radius= 0.8, Threshold = no more than 30.
Click OK to apply
11. right click on the duplicate layer and select blending
12. Find the "This Layer" slider at the bottom of the box
and move the black and white threshold markers in about 10
mm each side. Click OK
13. Done. If you now compare your unsharpened image and the
sharpened one you will see that only the edges have been
sharpened giving a more natural look.
PS: if you open up your original image and run the Sharpen,
or Unsharp Mask over it you can compare the difference to
only sharpening the edges. You'll notice a dramatic lack of
sharpening artifacts by following the above process.
Questions or updates? Contact me.