IT TAKES TWO TO TANGO
But let me give it just one more try. Maybe seeing an image made by a camera and a print like two dancers going through the intricate steps of a tango, yes it is a bit complicated, it is definitely interactive, and if serious even a bit dangerous. The tango is a dance to a particular kind of music. There are many kinds of songs, music, poems and stories told by the countless tangos written during its long history, as there are many different subjects a camera can reproduce that can eventually become a print. That a tango, the music, and the movement of two dancers together interacting to the music, the rhythm, the mood and its story; is to me very much like a photographic image once captured by a camera can become after much interaction within a computer reproduced as a printed image on paper that tells a unique story.
With just a photographic image file on your computer, it is like one hand clapping. With just one dancer there is no tango, just a solo dance that is something else. If the two dancers doing a tango are not closely matched it is like Mutt & Jeff attempting the impossible, it is not a tango, it is some kind of farce. That is like a computer display that is very bright 200.0 - 300.0 CD/m2, looking way over the head of printing paper that is about 90.0 CD/m2. The dancers need to be a match, the same brightness or height. The paper cannot get brighter it will only reflect a little less than 100% of the illumination falling on it, but the display can be made less bright, so do it.
A calibration and profile for a very bright display cannot match that of what a paper can produce through a printer, so even if you use software and a sensor to calibrate and profile a very bright display, you have not created a color range that can be printed - they will not dance together. I learned this in the many hours I have spent since getting my displays to 90/0 CD/m2 completely re-color correcting, adjusting and editing hundreds of archived image files done with brighter displays. The difference is much greater than one would expect, the image must be re-adjusted for brightness, but once that is done the saturation is too low, and the color balance is off, and some colors need a different adjustment than others It is a job I will never get done, they are files I have made over that last 20 years, and I don’t expect to be doing this till I am age 96!
So, what I am saying is that the tango dancers of digital image capture and print reproduction, must be matched closely and precisely, not just by the color translation of a profile, but also by the other factors of brightness, contrast and tone distribution that is saved as the parameters of a photographic image file by a computer. They are the two tango dancers, there is color matching in the profile of a display that is set at 90.0 CD/m2, 6500K and and gamma 2.2, and the brightness/darkness, contrast and tone distribution of an image file corrected and edited by a computer. The two must match at the particular parameters that define what paper is upon which the image will be reproduced.
But you say you have never seen or paid any attention to a couple dancing the tango very well. I chose the tango because it more closely exhibits the principles I am talking about, but any kind of dance, ballet, jazz, samba, rock ‘n roll, where two people interact to play out a precise form on a floor, it is the same thing, the two dancers have to be very much alike or it will look incongruous, comical , a mismatch. For someone who has no appreciation of dance it is is in sports by taking the two forms of football/soccer and trying to play either with a team of the opposite kind, American Football, and a soccer team in the rest of the world - the players must match the rules of the game. Basketball players don’t usually make ideal tennis players, golfers are different from wrestlers.
We have a very serious problem today because most of the LCD displays made in the world are constructed for the needs of offices and brightly lit homes - too bright for digital photography. Color Management with profiles was designed when there were only CRT’s monitors available, and all of them had a very limited maximum light output on average about 90.0 CD/m2. Technology advances, like LCD displays screwed that system by now offering LCD displays that are extremely different and much, much brighter. So the challenge everyone now has is doubly complex through no fault of anyone.
If you have a comment, they are welcome, so please post it. If you have a question you want me to answer please address an e-mail to David B. Brooks at: firstname.lastname@example.org