Re: curves and gum and Christopher James book
Title: Re: curves and gum and Christopher James book
The Harrington QTR works with many Epson printers, and is very inexpensive.
I am currently printing digital negatives on the Epson 2200 with a QTR profile for pure palladium plus an .acv curve that I add for greater linearity. I make the .acv curve with Mark Nelson's PDN system. With somewhat reduced accuracy you can also make the .acv curve with the ChartThrob program that has been mentioned, but you do need as minimum Photoshop CS2.
Basically, the QTR profile does the heavy listing toward linearity, and the .acv curve adjusts for small differences in curve shape of processes like carbon, palladium and vandyke.
I got the original QTR profile from Clay Harmon who put it on the hybrid site.
Basically I figure that anyone who says that adjusting your negatives for linearity does not work is someone who does not really know how to make prints. It works perfectly IMO if your system is calibrated. The idea is very simply -- you make a digital negative that prints in your process as the image looks on screen. I have made prints this way in carbon transfer, palladium, vandyke and kallitype, and it works great.
At 10:34 PM -0600 3/10/08, Michael Koch-Schulte wrote:
On Mon, Mar 10, 2008 at 9:04 PM, Don Bryant <firstname.lastname@example.org> wrote:
There are two scales that can be used for measuring tones in the curves dialogue the scales can be toggled with the double-arrowed button on the bottom gradation. One scale goes from 0 to 100 per cent. It's commonly used to define screen blackness in the graphic arts field, 0 being white (no ink) and 100 being black. The second scale goes from 0-255. This scale evolved from the binary math used in computers. 0 is black and 255 is white. (In truth both scales are binary behind the scenes in Photoshop) The first was a paradigm so widely used for so long that it's part of the graphic lexicon. When an graphic artist asked a offset press camera operator for a 10 per cent grey screen they knew what they were talking about. Photoshop started out as a graphics editor and evolved into a photo editor.