What is the difference between tolerance and dynamic range?

Tolerance refers to H &；; The projection range of the straight line on the D curve on the abscissa on the abscissa, that is, latitude, is defined as the exposure range of the photosensitive material to record the brightness contrast of the scene in direct proportion during photography. This projection range does not include toes and shoulders.

l = LG H2-LG h 1；

L=H 1:H2

l= 1:2^9= 1:5 12

Exposure range:

The logarithmic brightness range of ordinary objects is smaller than that of film, and the exposure latitude is larger. However, if the logarithmic brightness range of the object is equal to the useful logarithmic brightness range of the film, there is no tolerance, that is, there is only one exposure. For scenes where the logarithmic brightness range is greater than the useful logarithmic exposure range of the film, some details will be lost anyway.

Difference between tolerance and density

Dynamic range:

d = log(Power _ max/Power _ min)× 10；

dmin = log( 1000/960)= 0.02；

Dmax = log( 1000/40)= 1.40

As long as the dynamic range of the scanner is larger than the film, the information on the manuscript can be truly expressed, including some subtle dark details. & ltp Indent " style = " line-height: 120%； Margin:10px 0px; Text-indent: 30px" align="left "> Actually, scanner is different from film, and film can be regarded as a complete signal system, including input, DSP and output. The size of the final dynamic range is determined by the cell with the minimum value. At this time, the concept of numbers is needed.