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ConvertImageWithGimp

Page history last edited by PBworks 14 years, 1 month ago

In this description, we will take an image from photo to black and white line art. There are probably some extra steps, but this shows how it was actually done.

 

Start with a photo

 

Open it in gimp

Adjust the image with a filter

I used the find edges, edges filter

 

Convert the image to black and white Image, mode, black and white

All the color will be wiped out, but you need to turn it back into an rgb image to do the brightness contrast step.

 

Invert the values. Go to Layers, Colors, Invert

 

Crop the image so it doesn't have extra image information. Select, Image, Crop

 

Adjust the brightness and contrast until the grays are gone and there are lines

 

Print the image about the size you might want to use it. It is easier to work with large, then make it small later.

Go over the image with a marker

Add some variety to the image by having some lines thick and others thin

 

I then cut the image as a silkscreen stencil using a utility knife

Cutting the stencil took hours. In retrospect, this is not the right way to do it. What you should rather do is put a clean sheet of paper over the print and trace the parts of the image that you want. You need to have nice clean sharp lines with no shading. You could also use a paint brush and paint if you can get a solid enough line.

 

After determining that I might not have the right chemicals, or the stencil material might be old, I decided to scan the stencil rather than risk wrecking it. This will allow me to work with the image without damaging the on-of-a-kind stencil.

 

The scan was a color scan, black and white was too irregular.

 

I put the image on a wiki for online storage because the computer didn't have gimp.

The image also got uploaded to flickr for archiving purposes.

 

convert the image to black and white

It is gray and has low contrast.

 

Invert the values

 

Increase the contrast, lower the brightness and the image will become high contrast black and white.

not quite an instant black and white conversion, but it has some human touch.

 

This image should now be suitable for use as artwork in a vinyl cutter or laser cutter using vector strategy.

 

 

The descriptions of many of the photos in this set tell some of the process:

http://flickr.com/photos/connors934/sets/72157594504089055/

 

 

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