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③ the photographic properties of the sensitive film. Custom Car Flags Cheap
(a) sensitivity. The sensitivity is a sensitive film to light to indicate the degree of sensitivity. High sensitivity, you can take pictures in dark or higher shutter speed; sensitivity is required to take photographs in bright conditions or lower shutter speed.
At present, the more common sensitivity units custom in
The imaging conditions are the same circumstances, if the high sensitivity of sensitive film, you need exposure, on the contrary, the exposure. Therefore, in the sensitive film on the formation of the image density, sensitivity and exposure is inversely proportional relationship. The following equation: Custom Car Flags Cheap
S = K / H Outdoor Flags And Banners
Where: S – sensitivity;
H – exposure;
K – constant.
(b) density. Sensitive film by exposure, development processing, resulting in black silver like the number of particles known as the density, with the "D". Plate sensitive film density of 0.05 ~ 2.2, shall not exceed 3.0.
c gamma. Contrast refers to the original or the bottom plate image, the maximum density and minimum density difference. Image contrast on the camera bottom plate, due to the sensitive film performance, shooting conditions, developing conditions, often with the original contrast is different from the number that the relationship between them, the contrast coefficient "gamma" distinction between:
γ = image contrast / original contrast Yard Flags And Banners
Γ> 1 the sensitive film to shoot, you can get to the bottom plate than the original contrast. Γ <1 the sensitive film to shoot, you can get to the bottom plate is smaller than the original contrast. Car Flags
Contrast and gamma are two different concepts, not confusion. The image on the original and the bottom plate, the plate has a respective contrast, the contrast coefficient is inherent in the sensitive film of the performance.
(d) tolerance. Sensitive film according to the size of the original contrast between the ability of the proportion of records known as tolerance, tolerance is the inherent characteristics of the sensitive Car Flags