A light meter provides only a rough estimate of the exposure time. The positive anaglyphs must be drawn onto transparent paper. The sketches must contain orienteering marks so that the first spatial image correctly blends into the second. The x-axis in the ground plane is recommended as an orienteering point because it is from here that the viewing position of the eyes with distance d and height h is established. Both sheets are covered with a thin plate of glass so they remain fixed and do not contain any air bubbles.
All lines appear dark upon a light background.
This procedure is especially interesting when geometric dependencies are being studied. The result is then a bright, stick model in which a dark stick model is implanted With this, one obtains a good differentiation between the two parts of the picture. Since the dark lines of the positive anaglyph are more evident because of the increase contrast, one must decide which part of the picture should be represented by the negative anaglyphs and which by the positive ones. When viewing negative anaglyphs under UV-light, a supplement of fluorescent green No. 219 can be advantageous. With this one must consider that since the anaglyph projections are in the ground plane, a certain amount of distortion takes place.