First, what previous advice have you gotten?
Originally Posted by gwatson
Making a digital negative with inkjet printers involves two steps. One step is to choose a printing color (black, green, green + blue, etc.) that matches the contrast of the process, in this case argyrotype. This varies a lot according to printer. Mark Nelson's PDN system explains how to do that, but much too complicated to relate all of the procedures here.
Second step is to print a negative on your printer from Photoshop using the color selected and then maping the input and output values to produce a correction curve.
As a easier way that may give good results, down-load one of the curves on Dan Burkholder's website, assuming you are using the same printer. Unfortunately, printers vary a lot in terms of UV absorbance so you really need to be using one of the printers for which Burkholder provides curves to expect good results.