How to create a photo negative from your digital image
a digital image at 300 dpi/ppi
Adobe Photoshop or other software capable of inverting an image into a negative
use of a laser printer
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Choose a digital photo with dramatic contrasts between light and dark for the best alternative process results.
Using Adobe Photoshop or another photo-editing software, change the image to grayscale. Adjust the contrast if needed.
Save the image as a .tiff at the size you wish to print at 300 ppi/dpi.
Invert the image so that you have a "negative" which turns the light areas to dark areas.
The image must be accessible on a computer that is connected to a laser printer (NOT an ink jet printer). One-color laser printers are relatively inexpensive. Mine is made by Brother.