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The eye is, practically, a long-focus lens. It covers only a comparatively narrow angle, and in order to see as much as can be included in a picture made with a short-focus lens we have to move the eyes a little and look at the various objects in succession.

A small but noticeable patch of contrasting light or dark tone would more correctly be described as an accent than as a mass, and it will be found that, as a rule, an accent is needed to prevent a picture from becoming monotonous and uninteresting.

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An ordinary photographic plate or film is abnormally sensitive to the light rays at the violet end of the spectrum and is strongly affected by the ultra-violet rays, which are invisible though they are present in sunlight, but it is practically insensitive to red and to the colors at the red end of the spectrum. Therefore, an ordinary plate sees red as black and is affected only very little by orange and yellow, so that those colors appear very dark while, on the other hand, being so sensitive to blue and violet, these colors are made to appear too light. That is why we can use a red light in the darkroom, as the plate is affected, practically, not at all by red light.

...even if our range of tones is shorter and we have to compress the tones into a shorter scale, we can preserve truth of value only by keeping the tones in about the same relative proportions. We should make our lightest tone light and our darkest tone dark, and then get in as many tones as we can in between.

Where light falls on an object and is reflected back to the eye, we see a highlight; where it strikes at an angle and is reflected back other than directly to the eye we see halftones; where no direct light falls on the object we have shadows: and these highlights, halftones and shadows are modified by light reflected into them by other objects and by other parts of the same object.