Yes, that is the same as DOG (Difference of gaussian). :)
On Fri, Nov 7, 2014 at 3:56 PM, Elle Stone
> On 11/07/2014 03:34 PM, Garyfx wrote:
>>> You mean just exchanging colors?
>> Well, I may have not been as articulate as I could have. I want to take
>> images of trailers and turn them into line schematics or outlines. I want
>> the line drawing or frame of the trailers like the images I attached in my
>> original message.
>> And... a simple grey background is sufficient.
> This PhotoShop-specific link explains how to use divide blend mode to make a
> line drawing; the technique is the same when using GIMP:
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