الحجب والتظليل فى اثناء عملية التكبير (Dodging-Shading).كتاب التحميض والطبع والتكبير

Dodging and shading during the zoom process:

When exposing the film while it is in the camera, the lens records what is in front of it without choosing. Therefore, you may sometimes find that the negative image carries parts that we do not want to appear in the enlarged image, because if these parts were left, it would harm the composition or balance of the image and spoil its aesthetic value, or at least it would be a factor in drawing the viewer’s attention to secondary parts that have nothing to do with the subject. The original in the photo.

As an example of the parts that we may see obscured during the enlargement process.

Unwanted shadows on the face or in parts of the image.

_ Details in clothes or at the back of the image Background.

Here, the importance of the shading process appears to us in the integration of the photographic image as a work of art in which the photographer's thinking and feeling overlap, and that it is not just a mechanical or visual means that records the visuals without thinking or choosing.

Likewise, a single negative image may contain two areas of different degrees of density, which necessitates exposing the denser area for a period that may be much longer than what is suitable for the other area of ​​less density. Therefore, we find it inescapable to expose the sensitive paper first to the appropriate extent for the less dense area that has been obscured and shaded, while continuing the exposure for a period commensurate with the other, more dense area (Fig. 88, page 328).

The process of blocking or shading was done by using pieces of paper that are cut in different shapes (Fig. 80). It is also possible to use the hand or fingers to shade parts of the image without the others, or a piece of cotton is attached to the tip of a thin wire, or parts of thick cardboard are formed and fixed at one end. This wire.

In performing this process, the following is noted:

1- The hand or the cardboard should move in a continuous, rapid movement throughout the covering process, and that the hand or the paper should be far from the sensitive paper and closer to the magnifying lens so that neither clear or sharp shadows appear in the enlarged image.

2 - As the matter may require controlling the exposure of many parts of the image, so it may be preferable to increase the total exposure time. To achieve this, it is better to narrow the diaphragm aperture of the lens.