So the process for creating Cyanotypes all starts with the Negative. Well, OK, perhaps with the photo shoot to get a negative. I will do a post on that when I do my next shoot for this project. One could of course shoot film and have readymade negatives. For this project however I’m looking at creating 16×20 images and unfortunately I do not have a 16×20 View camera at my disposal. So, I’ll be shooting digital images and creating Digital Negatives. No, not creating Adobe .DNG files, and not the Digital Negative term coined by the father of Camera RAW files Thomas Knoll representing the RAW data itself but rather printing old style Negative transparencies on Acetate film using my Epson 3880 printer.
The concept of creating a Digital Negative itself is fairly simple; however doing it well is a little more complex. You could simply create a negative image in Photoshop and print it or use your printer driver software to print a negative image if you printer driver can do that, but both these processes would be wrong, or at least would not result in an optimum Cyanotype print with the best possible tones.
Secondly, more importantly and definitely a little more technically challenging is that the tones need to properly be converted, or mapped, to produce a good tonal curve specifically for the Cyanotype process. Your perfect image with great Whites, Blacks and Mid-Tones will not convert perfectly during the Negative Conversion and even if they did, they would be a perfect Negative conversion for printing on standard paper, not on the greatly reduced tonal range of Cyanotype papers.
|Negative Image, Reversed
For my first test I used an image that somewhat represented my project and then did a simple Negative Conversion and only eyeballed the curves to create what I thought would be a better negative based on my days in the darkroom. I then reversed the Negative image (flipped on the Horizontal) and printed my Acetate Negative. Again, I will cover in detail my printing process but for now note that I used the Epson’s B&W settings to get optimum blacks in my Negative.
|Fake Digital Cyanotype, Colors and Density not right but an accurate representation of the details.
The Negative was printed on what is considered to be the best Transparency Film available for creating Digital Negatives, Pictorico Premium OHP Transparency Film. Note that this overhead transparency film is clean. For creating Digital Negatives for traditional B&W prints and some other alternate processes, White (as opposed to clear) Transparency film is recommended; the Pictorico Hi-Gloss OHP White Film. For testing and to keep costs down I first purchased 8.5×11 inch sheets. I also purchased Sun Art pre-made Cyanotype paper in 5×7 sheets.
Using my printed Negative I laid it overtop (emulsion side down) of the pre-coated paper. Over top of that I laid a sheet of Contact Glass to press the negative and paper together. This was all done in my office, no darkroom required. I place this setup outside on a sunny day for five minutes creating other test exposures of 3 minutes and 10 minutes.
|Scanned Cyanotype, Some detail is lost, colors fairly good. If you enlarge the image you can see some of the diagonal banding from the paper.
On the pre-coated Sun Art paper my comment is based on both the cheap very thin paper that is used and on the banding effect that is either caused by their coating process or perhaps by the paper itself. Not sure which. But, used as kids’ projects by moms or teachers these would be very cool and very affordable.
Next post – Cyanotype – The Shoot
© 2013 Francois Cleroux
(Version 1.02 – March 2013)