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Ic - the problem there is with which print density are you calibrating your table for? The contrast will change and you will not be able to make a single table that would cover all densities in the print. That is, to you calibrate it to a specific dark tone, middle grey, or a specific highlight? Each one would need a separate table.
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 Originally Posted by Kirk Keyes
Ic - the problem there is with which print density are you calibrating your table for? The contrast will change and you will not be able to make a single table that would cover all densities in the print. That is, to you calibrate it to a specific dark tone, middle grey, or a specific highlight? Each one would need a separate table.
For me it is middlle gray. Basically I 'straddle' the step wedge exposure strips when I line them up. When I work I want the blacks blacker and whites whiter when I increase contrast, and visa versa.
Ilford has the exact same type of table to locate the exposure factors when switching MG filters when using a W45 Aristo. The Ilford one is also based on a middle gray, but the advantage of making one's own table is that one could base it on the blacks or the whites depending on how one lines up the step wedge contact prints.
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Right, but you do have to pick the tone you are calibrating for when you make a chart like that.
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