Histogram operability

[truthseer]

While reading chapter 5.1 of the SF 6 manual, and specifically Tool #1, the Histogram, I am still not sure how the operability of this tool is supposed to work. I am focusing on B&W negatives and when viewing the histogram I am able to move the Shadow, Highlight and the Normal/Logarithmic arrows back and forth. The values in the boxes change according to each "S," "H," and "N/L" change with the movement.

My question is where should the settings of each arrow be placed after making a prescan of an negative image? Is it a value judgement of the one that is viewing the histogram? Or is there a specific place on the histogram the arrows should be placed according to the variance of the graph? Does this movement affect the outcome of the output file?

I am not real sure how this operation of the histogram is supposed to opperate. Please give some insight to the operability other than what the manuel has to offer.

Thanks,

Darrell

[LSI_Kratzenstein]

In the Histogram you can set the lightest and darkest point. All "lighter" / "darker" points bekcome black, and the gradiation curve is set between the lightest and darkest point. You could easely see the effect, if you move them both hard in the histogram.