Guest Tutorial: How to Posterize using Gimp
Creative Team Member Eva (aka whitefrost(dereva)) created an artsy posterized effect on her Parliament of London page, and she put together a tutorial for us to show how she created the photo effect using Gimp, free photo editing software!
First, choose your background paper and the photo you want to work with. Then, scale the photo to 3600px on the layer above your background paper.
Then we need 4 layers of the photo, so duplicate the original photo layer until you have four of it.
On the top photo layer, choose the filter “Edge-Detect”, then filter “Laplace.”
Here you can see the result:
Then choose the 2nd copy of the photo and apply the “Artistic” -> “Photocopy” filter.
This is how it looks like now.
Next, remove the white parts of the “Photocopied” layer. You may prefer using layer mask to hide areas of the photo but actually i prefer the eraser. Anyway, remove the white part of the photo with layer mask or eraser.
Now choose the 3rd copy of the photo. Go to Colors Menu -> “Posterize” and choose the minimum value. If you set the marker to very left, you can see this.
Then select black color and erase it, then the same with white.
You may want to hide the layers that you don’t use at the moment.
In the next step, posterize the last photo layer with a different value.
Then, select the grey and dark blue colors and erase them.
If you hid some of your layers in previous steps, unhide them now. And here you are.
You can now merge all of the photo layers.
Choose a photo mask to make the picture edges uneven and set it to the picture. Here select the black of the photo mask then go to the picture and invert selection. So you can remove the unwanted area of the picture.
Now you can decorate your page a bit with some elements.
Here’s my finished page!