To change the threshold on my images, I first opened the original on photoshop and clicked the threshold button on the right hand side, found under the 'adjustments' tab
After clicking this, my image appeared like this, with very little depth and detail. A histogram appeared on the right hand side showing the detail of black and white within the image.
Using this histogram, I slid the little cursor at the bottom and adjusted the image so that it became how I wanted. I then saved the image and printed it out to the size I wanted to stick in my photobook.
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