الإضاءة لإظهار الملمس ( Fexture ) .. كتاب فن التصوير الفوتوغرافي

Lighting to show the texture (Fexture)

The texture and texture of things differ, some of which are soft, and some are rough. This difference in the texture of the surface of objects affects the way the light that falls on them is reflected, and thus affects their visible appearance. And the skilled photographer takes advantage of this feature to the touch
Objects by using appropriate lighting and directing it in a way that reduces the appearance of the roughness of a surface, or increases it according to his desire.

To illustrate this, let's do the following experiments:
Let us take a small board of corrugated cardboard, and focus two light bulbs of equal intensity, one on each side, at one distance from this board, as shown in Figure (8). We see that the image resulting from this situation of lighting has almost lost its texture.

Let us now move the lamp on the left side and bring it close in such a way that its light is very oblique with respect to the wavy surface, and let us extinguish the light on the right side. The image resulting from this situation of lighting is shown in the drawing and picture (9), where we notice an exaggeration in the texture of the surface.
Finally, move the light to the position shown in drawing (10), adding an auxiliary light to the right side of the camera. This mode results in an image with a natural texture.

As you have seen, the texture can be photographed so that it appears as it is in reality, and its features can be blurred or those features can be shown in an exaggerated manner.
To hide the roughness of the skin texture, and on the contrary, it is advisable to take pictures of men with strong lighting to show the roughness of their skin texture. Picture (11) gives an example of using lighting to exaggerate by showing a zigzag texture.