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#1 12-04-2018 09:21:15

koalapaper
Nouveau membre
Date d'inscription: 02-04-2018
Messages: 9

Image Contrast and Density

The contrast of image layer should match with each other, and it should be balanced at any density level. Otherwise, it is impossible to get a good color balance in the whole exposure range. For example, if the negative contrast of the green layer is lower than the contrast between the red layer and the blue layer, the large density of the photo paper, such as hair and shadow, will be green, although the medium density may be well balanced. Poor film preservation, contamination of processing fluids or incorrect mixing of liquid, excessive or insufficient development of photo paper factory, and improper bleaching or fixing may cause imbalance.

The contrast should also be appropriate, neither too high nor too low. A photograph with low contrast will feel "dull" or "smooth", because the density range of high light and shadow is too low. If the picture contrast is high, because of the high light and shadow density range is too large, the tone is too hard. At high gloss wholesale photo paper, there is lack of detail. It will be "white like washing", lacking details in the shadow, and it is shown as "accumulation" and "clumps". High contrast is mostly due to underexposure and overdevelopment, while low contrast is often the result of overexposure and underdevelopment.

Light and shade are one of the most significant attributes of the scene. The brightness of scenery should eventually be restored to the corresponding level density of photographs, which is in black and white photographs and color photographs. Speaking from the perspective of professional photo paper manufacturer, is the need to correct tone reduction. Effect of density under the developing conditions and the camera, enlarger exposure.

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