"amputated" appearance. It is of course possible to create a three-dimensional "pop out" frame surrounding the subject in order to avoid this condition. If the subject matter is a landscape, you may consider putting the frontmost object at or slightly behind the surface of the screen. This will cause the subject to be framed by the window boundary and recede into the distance. Once the adjustment is made, trim the picture to contain only the portions containing both left and right images. In the example shown above, the upper image appears (in a visually disruptive manner) to spill out from the screen, with the distant mountains appearing at the surface of the screen. In the lower modification of this image the red channel has been translated horizontally to bring the images of the nearest rocks into coincidence (and thus appearing at the surface of the screen) and the distant mountains now appear to recede into the image. This latter adjusted image appears more natural, appearing as a view through a window onto the landscape. Scene composition Dual purpose, 2D or 3D "compatible anaglyph" technique Since the advent of the Internet, a variant technique has developed where the images are specially processed to minimize visible mis-registration of the two layers. This technique is known by various names, the most common, associated with diopter glasses, and warmer skin tones, is Anachrome. The technique allows most images to be used as large thumbnails, while the 3D information is encoded into the image with less parallax than conventional anaglyphs. Modern Anaglyph Rendering Techniques Anaglyphic images made with cameras used to be constructed by having the lens covered with the appropriate coloured filter. Modern video/image rendering programs use a similar technique to achieve the anaglyph effect. Modern anaglyphic rendering programs used to use simulated filters over the virtual cameras, for Red/Cyan anaglyphs the left camera blocking all but red light being perceived and the right blocking all but the blue and green light being received. This worked okay for creating colourful anaglyph images but the results were prone to retinal rivalry In 2001 Eric Dubois () released a paper titled 'A projection method to generate anaglyph stereo images' This paper described a method of filtering for anaglyph images that retained much of the colour and reduced ghosting and retinal rivalry The algorithm used to create this effect is called the least-squares algorithm. The result is