|Four separate images are taken on B&W film or captured with a
grayscale digital camera through RED (25), GREEN (58), BLUE (47) and ULTRAVIOLET
(403) transmitting filters. The images are recombined into RED-GREEN-BLUE
colour channels in Adobe Photoshop. The images created from the RED-GREEN-BLUE
filters appear as natural as those obtained on colour film or a colour digital
camera. The image from the GREEN-BLUE-ULTRAVIOLET filters are interesting
false-colour renditions incorporating the ultraviolet image.
If a colour digital camera is used, only two images are taken, one unfiltered and another through the UV-transmitting filter. The RED-GREEN-BLUE images can be extracted from the unfiltered colour image using the "split channels" function in PhotoShop.