Yes, that is the same as DOG (Difference of gaussian). :)

On Fri, Nov 7, 2014 at 3:56 PM, Elle Stone
<ellest...@ninedegreesbelow.com> wrote:
> 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
>> JPG
>> images of trailers and turn them into line schematics or outlines.  I want
>> just
>> the line drawing or frame of the trailers like the images I attached in my
>> original message.
>>
>> And... a simple grey background is sufficient.
>>
>> Thanks
>>
>
> This PhotoShop-specific link explains how to use divide blend mode to make a
> line drawing; the technique is the same when using GIMP:
>
> http://blog.advancedphotoshop.co.uk/tutorials/how-to-use-the-divide-and-subtract-blending-modes-in-photoshop-cs5/
>
>
>
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