Week 3 Notes

# Week 3 Notes - Gamma Gamma 3/24/2008 8:02:00 AM Slope of...

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Gamma 24/03/2008 07:02:00 Gamma Slope of the straight line portion of the D-Log H curve Measure of development contrast, which is one factor in determining the  overall negative contrast Gamma (slope) is most effected by development Average Gradient Used when there is no straight line portion or there are 2 straight line portions Choose any two points, draw a line, determine slope Caution: A curve can have many different gradients Ilford defines two points as o 0.1 above B + F o 1.5 log H units to the right o Consider a normal value equal to 0.55 Contrast Index A method for the measure of the contrast of an emulsion Takes into account the toe portion of the curve Is an average gradient method o Benefit is that it is measured over the most useful portion of the film  curve taking into account the toe o Assuming that the exposure onto the film was done correctly

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## This note was uploaded on 04/21/2008 for the course M&P 073 taught by Professor Salvaggio during the Spring '08 term at RIT.

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Week 3 Notes - Gamma Gamma 3/24/2008 8:02:00 AM Slope of...

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