Picture of Pop Art Negatives for Lumi Inkofilm
At our recent Lumi Build Day, we decided to make a pop art themed piece as a tribute to the founders of our makerspace. The important part was getting the negatives just right so we could get more of a painted on look than an actual photo and the right features were visible.

Things you'll need
A computer running GIMP
An inkjet printer
A nice digital photo
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Step 1: Open the picture in GIMP

Picture of Open the picture in GIMP
I'm choosing GIMP because it's free and available on all operating systems so there's no reason for you not to have it :)
You can download it from www.gimp.org

To make things easier, make sure you choose a picture that has a lighter background and you have a clear shot of the persons facial features. The best pics are casual portraits where the subject is unaware

Step 2: Desaturate the image

Picture of Desaturate the image
Inkofilm works best in grayscale or black and white so no need for color here.

Right click image > 'Desaturate...'

Step 3: Adjust Brightness/Contrast

Picture of Adjust Brightness/Contrast
Next, adjust the Brightness/Contrast levels so you have clearly distinguished whites, grays and blacks

Step 4: Duplicate layer

Picture of Duplicate layer
Then duplicate the layer at least 3 times by right clicking and selecting duplicate layer. These layers will each take one shade of gray. The more variations you want the more layers you should have.

Right click image in Layer toolbox > Duplicate Layer

Step 5: Apply Threshold

Picture of Apply Threshold
Next, select the top layer and make it a two tone image by using threshold. This is going to be your darkest layer so make suer you the features you want to be darkest are clear. With this layer I made sure that his pupils, eye brows and beard were clearly defined.

Right click image > 'Threshold...'

Slide the marker from side to side to get the right balance

Step 6: Reduce opacity of layer

Picture of Reduce opacity of layer
When you're satisfied with the threshold level, reduce the layers opacity to about 30%. This will let you work on the other layers while still being able to see the foreground.

In Layer toolbox on the right side of the screen, slide opacity down to 30%