S. Farooq  
Department of Geology
Aligarh Muslim University

email farooq.amu@gmail.com

Virtual Geological Field Trip to Jhalawar

Anaglyph 3D


The stereoscopic 3D effect achieved by means of encoding each eye's image using filters of different (usually chromatically opposite) colors, typically red and cyan, is termed Anaglyph 3D. Anaglyph 3D images contain two differently filtered colored images, one for each eye. When viewed through the "color coded" "anaglyph glasses", each of the two images reaches one eye, revealing an integrated stereographic image. The human visual system fuses this into perception of a three dimensional scene or composition.

Anaglyph images are much easier to view than either parallel (diverging) or crossed-view pairs stereograms.  However, these side-by-side types offer bright and accurate color rendering, not easily achieved with anaglyphs. Recently, cross-view prismatic glasses with adjustable masking have appeared, that offer a wider image on the new HD video and computer monitors.

Viewing anaglyphs through spectrally opposed glasses or gel filters enables each eye to see independent left and right images from within a single anaglyphic image. In a red-cyan anaglyph, the eye viewing through the red filter sees red within the anaglyph as "white", and the cyan within the anaglyph as "black". The eye viewing through the cyan filter perceives the opposite. Actual black or white in the anaglyph display, being void of color, are perceived the same by each eye. The brain blends together the red and cyan channelled images as in regular viewing but only green and blue are perceived. Red is not perceived because red equates with white through red gel and is black through cyan gel. However green and blue are perceived through cyan gel.

Anaglyph of Lonar Crater

Anaglyph of Ramgarh Crater


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S. Farooq

Department of Geology

Aligarh Muslim University, Aligarh - 202 002 (India)

Phone: 91-571-2721150

email: farooq.amu@gmail.com