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.
American photographer (1880–1962)
Arthur Hammond (1880 - 1962) was a pictorialist photographer, who has written books like Pictorial Composition in Photography.
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A photograph can be made with an uncorrected lens, or with no lens at all by making an exposure through a fine needle-hole in a thin metal disc, and the result may be a picture showing the characteristic virtue of photography, the rendering of infinitely delicate gradations of tone. This is where photography stands alone, and this is the distinguishing quality which has given it a place among the fine arts.
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.