The Find Edges filter is possibly the most commonly used filter used to create line drawings, but the filter results in lines made with shades of gray. The reason for this is that Find Edges makes low-contrast areas white, medium-contrast areas gray, and high-contrast areas become black. It also turns hard edges into thin lines and soft edges into fat lines. The result is a line drawing that is very different from the thin lines that we get by using the Smart Blur filter. It can, however, transform some digital photos into some pretty cool line drawings.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.