>> Hang in
there ....We're almost finished!
Next we go into Photoshop and either create a new document or load an
image you'd like to convert into a custom negative.
Go to
Image>Adjust>Curves. This valuable tool allows us to enter input and output
values ...exactly what we have from our tests!
Under the graph, there are two tiny arrows, click them so that the tonal
scale goes from left to right: white to black. This will show us the values in
% values rather then the 256 values computers use.
>> This next thought might seem a bit confusing: our Gum output
values in our chart are now our input values in Photoshop. As such, our previous input values are now our
output values.
This is all because we are now reversing the process a
bit. For example: we want the value 0% (white) in our image file to print as the relative
value 0% (also white) in our gum print.
0% in our tests printed from a value of 86% on our
negative. So we have to tell Photoshop's curves to turn all 0% values of our photograph into 86%
values so that they print as 0% in our gum print, corresponding to the 0% in our digital image.
We set all these points in our curve by specifying our particular input and
output values from our Average scale chart, keeping the above paragraphs in
mind.
The resulting curve should look something like the curve to the left,
sloping in a downward fashion from left to right in a negative slope (remember high school algebra)
Hit save... in the curves window and Save this Curve!!!!! Name it something
like, Custom_gumneg so that you can easily find it later. |
