Dodging
The process of dodging (also: holding back ) reduces the exposure time for certain parts of the image when exposing photographic materials with the aid of a magnifier . Dodging is a way to compensate for excessive negative contrasts or to achieve special creative effects. In the photo laboratory, dodging usually takes place when exposing negative material ( photo paper ) and in this context has a lightening effect. Dodging can be used, for example, to improve the drawing in the shadow areas of an image if it would be too weak without this intervention.
For dodging, one reaches into the beam path of the projection of the enlarger with the hand or a cardboard in order to reduce the amount of light falling on the photographic material on the desired image parts. To avoid scattered light , black cardboard is preferably used for this purpose, which is usually held on a wire to reach areas in the center of the image. The box is constantly moved (hence the term "waggle") to avoid sharp edges. The duration of the intervention in the beam path is determined with the help of test strips .
The reverse process - the partial increase in the amount of light on parts of the image - is called post-exposure .
image editing
Modern image processing programs offer tools, the effect of which is based on the manual process of dodging and which enable partial lightening in digital image processing .
Individual evidence
- ↑ David Präkel: Basic knowledge photography: exposure. Addison-Wesley, 2009, ISBN 978-3-8273-2866-3 ( online ).