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General Photography
Balancing Exposure and Processing
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<blockquote data-quote="WayneF" data-source="post: 406659" data-attributes="member: 12496"><p>Increasing ISO with analog gain in digital cameras has a similar effect as shifting the histogram higher. Both become brighter, and both also boost the low level noise. Both CAN reduce dynamic range, but only if there are already high values that ultimately get shifted off scale and lost.</p><p></p><p>But there is a big difference between analog and digital. </p><p></p><p>Analog is the real world, and has no discrete steps. Analog has no clipping end point.</p><p></p><p>For example, this is where processing to remove the orange cast from color negatives differs. This is a very minor issue when using color filters in the analog light, trivial to do, no bad effects. But trying to shift digital data that much involves huge clipping issues, never very satisfactory. For example, film scanners do this job by increasing the exposure time of the blue and green channels, relative to the red channel. This mimics analog action of a color filter, and is much superior than trying it digitally later.</p></blockquote><p></p>
[QUOTE="WayneF, post: 406659, member: 12496"] Increasing ISO with analog gain in digital cameras has a similar effect as shifting the histogram higher. Both become brighter, and both also boost the low level noise. Both CAN reduce dynamic range, but only if there are already high values that ultimately get shifted off scale and lost. But there is a big difference between analog and digital. Analog is the real world, and has no discrete steps. Analog has no clipping end point. For example, this is where processing to remove the orange cast from color negatives differs. This is a very minor issue when using color filters in the analog light, trivial to do, no bad effects. But trying to shift digital data that much involves huge clipping issues, never very satisfactory. For example, film scanners do this job by increasing the exposure time of the blue and green channels, relative to the red channel. This mimics analog action of a color filter, and is much superior than trying it digitally later. [/QUOTE]
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Balancing Exposure and Processing
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