Re: Simple & Stupid Curve Generator for Digital Negatives

Sounds quite handy, but what about those of us without Exel? Is there any
other way of accessing the file?

Jack Reisland

Loris Medici wrote:

> Hi Don,
>
> I) Determine your exposure time for black (using a blank negative and
> bracketing, just like silver-gelatine printing).
> II) Expose your paper with a digital 100 step tablet using the time you
> found in step I (I made the 100 step tablet in Photoshop; 10x10 squares,
> starting with 1% luminosity - ending with 100% luminosity, each square
> 2x2cm @ 360dpi - you may use a less accurate scale if you like)
> III) Inspect the print and determine the first clear square - this will
> be your 100% density value. Use the eye dropper on the 100 step tablet
> file to determine the 100% density value equivalent in the 256 scale.
> IV) Use the value you found in step III as "Max Value" in the following
> Excel file:
> http://www.geocities.com/loris_medici/loris_curve_generator_for_digital_
> negatives.xls and create a curve using values in A column as input, and
> values in D column as output.
> V) This will give you a good starting point (assuming you're printing
> black-only or quadtone and your B&W output is pretty linear), print a
> photo which also includes 21-step wedge, evaluate & fiddle a couple of
> times.
>
> Hope this helps - I made my cyanotype curve using this method; it works
> for me.
>
> Regards,
> Loris.
>
Received on Fri May 28 03:00:13 2004