I've been contemplating trying some of the "alternative" printing methods p- starting out with the Cyanotype.

So armed with a 40% off Borders coupon this weekend, I purchase Digital Negatives: Using Photoshop to Create Digital Negatives for Silver and Alternative Process Printing by Hinkel and Reeder, 2007.

Although I have not yet read it, I am somewhat puzzled by the following statement on page 19:

"...One common critique of the digital negative is that it is not as sharp as a film negative. This is definitely true. Digital negatives can hold one hundred lines per inch of detail (or even a bit more), but film can hold thousands of lines per inch...But the detail of the digital negative is more than sufficient for making very sharp prints when contact printing..."

"One hundred lines per inch" translates to about 4 lines per milimeter. Is a resolution of 4 lines per milimeter truly sufficient for a print?

Thomas