Clean up line art
I have a nice simple trick for cleaning up line art. This only works if the image doesn't contain smooth gradients but only black lines and filled black areas.
Convert your image to grayscale (
Image/Mode/Grayscale). It should look like this:
Scale up your image 400% (
Image/Image Size). Make sure to choose
OKand you will have this:
Now, convert the image to bitmap mode (
Resulting in this:
Convert the image back to grayscale. Let's clean the jagged edges a bit using
Filter/Noise/Dust & Scratches:
Which will give us a little cleaner result:
Now we are almost done. In
Image/Image Size, scale down the image to its original size (25%). Again, make sure to use
The result should look like this:
You might need to experiment with individual settings on different originals. Your image might need a little
Brightness/Contrast before going through the process - you need to make sure that anything you want to be black must be more than 50% black - anything less will become white.
Remember to always scale up and down by a factor of 4 or more. If you scale it less you might get unwanted pixelation.
If you have many images you might want to make this into an action.