Reciprocity failure in color film

While working on my slide collection digitization project, I came across some classic examples of color film reciprocity failure.  This is not a problem with modern digital photography, but something one should be aware about, otherwise it will surprise you when it crops up..

For starters, let’s consider the concept of reciprocity. Reciprocity refers to the simplification that the response of silver halide is a function of the total exposure. As a result, you should be able to achieve the same density of silver grains by exposing to a fixed total amount of light.  This fixed amount  is equal to the exposure time multiplied by the light intensity.  The idea is that the same density is achieved, say, intensity I in one second and with half the intensity or I/2 in two seconds.  Film does not strictly respond in this way.  At extremely low light levels this is not strictly true – hence what is known as reciprocity failure.  At low levels of

Figure 2 - Uncorrected digitized Ektachrome image of a wet street at night in NYC, illustrating reciprocity failure. (c) DE Wolf 2013.

Figure 1 – Uncorrected digitized Ektachrome image of a wet street at night in NYC, illustrating reciprocity failure. (c) DE Wolf 2013.

light the film responds much more slowly so you need a longer exposure to get the same density on your negative.  For color films things become more problematic as each of the three color layers respond differently to low light level.  In general, with slide films green is more responsive than yellow; so the image slips into a greenish tinge.

This can easily be seen in Figure 1, a digitization of an Ektachrome transparency, taken around 1970, of a New York City Street on a rainy night.  The image has clearly, shifted towards the green.  You’ve got to decide whether or not you find this aesthetically pleasing.  Of course, once you’ve got the slide digitized it is a simple matter to adjust the color back to normal, which I have done in Figure 3.  So you can decided which image you like better: uncorrected Figure 1 or corrected Figure 2.

Figure 2 - Color-corrected version of Figure 1.  (c) DE Wolf 2013.

Figure 2 – Color-corrected version of Figure 1. (c) DE Wolf 2013.

I showed this image to several colleagues, and it was unanimously decided that, in fact, the image looked better as a black and white.  This is presented below as Figure 3, and speaks to the power of black and white photography to create mood.

Figure 3 - Night scene of NYC in the rain, c 1970," (c) DE Wolf 2013.

Figure 3 – Night scene of NYC in the rain, c 1970,” (c) DE Wolf 2013.

 

Why Albert Einstein is wearing his wife’s coat explained

My posting about memes and the fact that Albert Einstein is wearing his wife’s coat – a jacket that buttons right to left has generated some interest.  As a result I decided to delve into the problem a bit and do some photographic forensics.

Figure 1 - Einstein facing the right way and wearing his own coat.  1947 from the Wikimediacommons and in the public domain.

Figure 1 – Einstein facing the right way and wearing his own coat. 1947 from the Wikimediacommons and in the public domain.

I wanted to put Einstein in what was definitely the correct perspective.  I found two images where the orientation is definitive.  The first, shows Einstein writing on the blackboard, where if we can read the equations, it’s not a mirror image.  The second, shows Einstein shaking hands, a right hand activity, upon receiving his certificate of US citizenship from Judge Phillip Forman.  The important point in these images is to notice the distinctive nature of Einstein’s two eyebrows.  The right eyebrow is darker in the center, while the left is more uniform in coloration.

So then if you return to our original image.  You see that it is the left brow that is smaller.  The image is reversed, mirror flipped.  The Wikimedia site is definitive.  It shows the original image from 1947 and facing right and facing left variants.  Somebody along the way decided that Albert would look better facing to your right, despite the fact that it dressed him in borrowed robes, and was just a bit disconcerting to the dress-code meme-sensitive among us.  So allow me to restore Einstein to his full uncropped and unflipped 1947 glory in Figure 1.  I am certainly glad that we got that straightened out!  Columbo and Monk would be proud.

 

Photography and the sin of pride

Figure 1 - The Roman Pantheon, from the Wikimediacommons, image by Bengt Nyman under creative commons license.

Figure 1 – The Roman Pantheon, from the Wikimediacommons, image by Bengt Nyman under creative commons license.

Among the seven deadly sins the sin of pride is considered not only the worst, but the root cause of all others.  The construction of the Tower of Babel was considered a classic biblical example of the sin of pride. Dante’s definition of pride was “love of self perverted to hatred and contempt for one’s neighbour”.  Whoa!  That’s serious stuff and not really what I want to write about here.  I’m more concerned about your everyday pride – perhaps not reading so high on the Father Guido Sarducci’s “How to Pay for your Sins Scale.”

There’s a lot of things that we as individuals are proud of.  I am proud of some of the scientific work that I have done, proud of some of my scientific writings, proud of the book book that my colleague Kip Sluder and I have edited and nurtured through four editions, and yes, proud of some of my photographs.  There’s not so much wrong with any of this kind of feel good about yourself stuff as long as you remember not to take yourself too seriously.

And as long as you remember to keep it all in proper perspective.  I remember that when my book first came out I would hold it up and think: “Pretty good I made this!”  Well, at about that time I happened to visit Rome on vacation, where I wandered into the Roman Pantheon – The Temple to all the Gods.  This is a remarkable building.  I have included an image of it as Figure 1. The Pantheon is deceptively designed in that its facade is meant to look like the Athenian Parthenon, the Temple of Athena.  But when you enter it you emerge into a giant dome, really a sphere (the ancients realized that the Earth was a sphere and believed that it was surrounded by the concentric spheres of cosmos) with a marvelous window at its center.  This is meant to symbolize everything (a modest endeavor to be sure).  This building is truly wonderful and almost beyond description.  You emerge again breathless and look back from whence you came and there above the portico, inscribed in giant letters for all the world to see are the words: “M·AGRIPPA·L·F·COS·TERTIUM·FECIT,” which basically means: “MARCUS AGRIPPA MADE THIS.”*

Hmm, my little book paled in comparison.  I tell you this story kind of as a parable in relationship to photography.  In photography, indeed in life, one needs to do for the love of doing and seek to do good and beautiful work.  One reads so many biographies of photographers, scientists, artists that say something like: (s)he was unappreciated is her/his lifetime.  The point is that while it is nice to be loved, do it for yourself, the rest: fame, riches, whatever is serendipity.  Indeed, the goal to be great as opposed to the goal to be good is a dangerous one, witness all of the cases of scientific fraud, perpetrated by those who sought fame and somewhere along the way lost the meaning of being a scientist.  This takes us full circle to the sin of pride.

I know so many people that are true amateurs – someone who does something purely for the love of it.  And among these are some of the finest photographers that I know.  And how do I judge that?  The answer is obvious.  It is that their work speaks to me and contains a deeply personal vision.

And what of Marcus Agrippa and the Pantheon that he built?  What of the deadly sin of pride?  The answer, of course  lies in the famous poem “Ozymandias” by Percy Bysshe Shelley (1792-1822).

I met a traveller from an antique land
Who said: “Two vast and trunkless legs of stone
Stand in the desert. Near them on the sand,
Half sunk, a shattered visage lies, whose frown
And wrinkled lip and sneer of cold command
Tell that its sculptor well those passions read
Which yet survive, stamped on these lifeless things,
The hand that mocked them and the heart that fed.
And on the pedestal these words appear:
`My name is Ozymandias, King of Kings:
Look on my works, ye mighty, and despair!’
Nothing beside remains. Round the decay
Of that colossal wreck, boundless and bare,
The lone and level sands stretch far away”.

* Actually the inscription was put there during a later renovation by the Emperor Hadrian and means, in its entirety: “Marcus Agrippa the son of Lucius made this in his third term as consul.”

Marcus Aurelius, Kurt Vonnegut, and the photograph as time machine

 “For a man cannot lose either the past or the future: for what a man has not, how can any one take this from him?

Marcus Aurelius “Meditations,” 167 A.C.E.

In his, Meditations, Marcus Aurelius (121-180) raises the point, since echoed by many western philosophers, that we only possess the present,  We don’t possess the past, because it is gone, and we don’t possess the future, because we don’t have it yet and perhaps never will.  It is the Stoic rendering of live, perhaps better stated, act in the moment.

I spoke yesterday about copying my old slides.  My photographic life, in terms of color images, is divided into three strata.  My slides days, my color print days, and my digital days.  So my slides are the oldest and their digitization takes me back to things that I really haven’t seen sometimes in forty-five years.  There are a couple of aspects to that.  First of all you get to relive all of the moments – I can invariably remember the act of capturing the image.  And second, there is the desire to understand the person who took the images.  That person is you, or somehow related to you, and you feel that if, via these images, you can somehow get into the head of that photographer that you somehow learn something important about yourself. Phew!  That’s a complex sentence.

Figure 1 - "Portrait of the artist as a young man, 1971," sigitized Kodachrome transparency. (c) DE Wolf 2013.

Figure 1 – “Portrait of the artist as a young man, 1971,” digitized Kodachrome transparency. (c) DE Wolf 2013.

In this context photograph functions like a time machine.  Photography is momentary and it is intimate.  If I show you a painting or a sculpture of, say, Abraham Lincoln, you think: “OK, nice painting or nice statue.” It’s somehow abstracted.  You know that it is a creation and therefore at least one degree of separation away from the subject (Abe Lincoln).  But if I show you a photograph of Honest Abe, you think: “Oh wow.  That’s really him!”  A photograph brings this magic with it.  Fox Talbot and Louis Dageurre put that magic there, and we are still enchanted 150 years after.  And even more curious is the fact that if I tell you that it’s really only Lincoln’s head and face transposed on Calhoun’s body, you are unperturbed.  The intimacy remains!  The magic is still in the photograph.

So there you have your life, spread out randomly on the table – chronology lost.  Photography creates the sense that Aurelius was wrong – that is, of course, an illusion.  But for a while, at least, you feel like Kurt Vonnegut‘s Billy Pilgrim.  You have become “unstuck in time.”  You can ponder your own youthful face or the image of some long forgotten scene – a place that might no longer even exist.  This is truly the magic of the medium.

Life returns to normal in Watertown

Last Friday a colleague and I went out for lunch and watched a helicopter hovering over the site of the capture of the Marathon bomber.  It turns out that this was recording the removal of the now infamous bullet-riddled boat as evidence.  Well, Watertown and Boston, at some level, are returning to normal.  Spring is magnificent on the Charles Reserve.  So after all this heavy duty discussion about memes and memetic evolution, I thought that something light was in order – something warm and cuddly, something symbolic of renewed hope.

This past weekend the first gaggle of Canadian baby geese was born.  I was amazed at how many of them there were.  They had not yet taken to the water, but hid themselves perfectly camouflaged by the moss on the river bank.  Papa goose had proudly taken the majority of his gosling charges  along.  Momma stayed behind to bring up the rear and prod on these two slow pokes.  There was something wonderfully normal in all of this – something expectant and promising.

Figure 1 - "Hey! Wait for us, mom!" (c) DE Wolf 2013

Figure 1 – “Hey! Wait for us, mom!” (c) DE Wolf 2013

 

 

 

The meaning of photography – are we more or less connected, revisited

We started this discussion about the meaning of photography and of images as memes with the basic question whether we are more or less connected today compared to people of the past.  I think that you can guess where I stand on the issue.  Overwhelmingly, I believe that we are more connected.  Photographic images are representative of memes and the more we share photographs and other forms of information and memes, the more we are connected as a global community.

So if you are engrossed in your communication with a larger community than just the people around you, then you are more connected.  I emphasize the word just.  Don’t ignore the people you are with.  You are interacting directly with them in a much more human context than can ever be achieved electronically.  Indeed, failure to do so can, for example, totally ruin your love life.  You are treading perilously close to what William Congreve (1670-1729) (not William Shakespeare) said in his “The Mourning Bride (1697):”

“Heaven has no rage like love to hatred turned
Nor hell a fury like a woman scorned.”

If you to any degree believe in the concept of memetic evolution, then you accept, to that degree, the view that this kind of replication through social communication of ideas (and images) is essentially a manifest destiny.  We are meant to do it and must do it in order for our culture (a global and interconnected culture) to evolve.

This said, it must be pointed out again that technology expands choices.  It does not make ethical decisions.  There is as much misinformation as valid information on the internet.  I am constantly dismayed by the foolishness on social media – doctored images and false “facts” to name but two.  It is as if everyone’s brains had turned to mush!

As we reach for the for a better world through communication of images, memes, and ideas; as we literally reach for the stars, we must remember what, this time William Shakespeare, said:

“The fault, …, is not in our stars,
But in ourselves, that we are underlings.”

Image and the meaning of the sacred

Yesterday, I wrote about images of the Challenger disaster and how the event, and by connection the images of the event, became sacred.  Not surprisingly, sacred memes and their connected images are a quintessential element of human culture.  The example given spoke directly of God.  But it is very important to point out that while the sacred as it relates to religion and numinous deities is certainly a widespread class of cultural memes, there are other memes that we hold sacred.  We hold family sacred. We hold country sacred.  We hold our political systems and institutions sacred.  We hold our cultural traditions, our literature and our legends all sacred.  These are all memes, and whenever an image resonates with a sacred meme it strikes a chord with which we relate very deeply.

Our religions seek to explain our place in the universe.  And, in a sense, anything that serves the same role we also hold sacred.  If we are overwhelmed by the beauty of nature, we hold that sacred.  If we stand in respectful awe at ancestors who defended our nation and way of life, we hold them sacred.  In the past couple of weeks, I showed images of several scientific greats: the Curies, Einstein, and Tesla.  All of these individuals sought to explain the place of men and women in the universe, and in a very real sense we hold them sacred.

The role of photography in all of this is defining.  Look at the images of these people, we can almost touch them, and the hair may rise on the back of our necks.  But in all cases these people are gone from us, replaced, extended, and redefined by palpable and cogent memes.

It is significant to point out that the sacred is culturally specific.  In his magnum opusThe Masks of God,”  Joseph Campbell points out that God does not appear to the native American, in the sweat lodge, in the robes of Jesus, but rather in the form of an eagle.  But we believe that the context is universal.

I  have seen this mask effect first hand.  I was once in a museum looking at a painting of a woman in a shower of gold coins.  It seemed very strange, and I read the label “Zeus Seducing Danaë in a Shower of Gold.”  We hold very dear and sacred the myths of the Greeks and Roman.  Judging by our art, it is almost as if they are part of our religions.  But this image, this meme, so clear in the renaissance was lost to me.  The story is from Ovid’s “The Legend of Danaë.”  At least I recalled that she was the mother of Perseus set adrift in a box (like the Meme of Moses).  When Acrisius consulted the oracle(ever up to mischief) he was told that he would have a daughter, whose son would grow up to kill him.  Now that was a big “uh oh” in Greek mythology, otherwise ever ripe with matricide, infanticide, and patricide.  So he cast his daughter Danaë in a subterranean dungeon so that she would not meet any suitable men.  So along comes Zeus, who to impress the maid appears as a shower of gold coins.

Another example of meme lost or meme mutated is when we attempt today to read Shakespeare.  Hamlet says: “Time is out of joint.  Oh cursed spite, that ever I was born to set it right.”  We have come to believe in an ever rapidly changing world.  To the Elizabethans the universe was static and unchanging.  Hit them with a comet and watch out.  Hamlet knows that to mess up the order of the world put you in serious trouble with the big guy upstairs.  However, his uncle has upset the world order, and it is Hamlet’s responsibility to fix it.  But this very act of fixing it, he is messing it up again.  It’s kind of a Shakespearean “Catch 22.

What we are ever seeking is to understand our place in the universe and in that context, we are ever seeking the sacred and images that resonate with sacred memes.  Let’s be clear what we mean by resonate.  You move a bow across the a string on a cello.  The bow attempts to impart all sorts of tones to the string, but they are almost all damped out.  The bow may even attempt to get the string to vibrate laterally, which it refuses to do.  All of the frequencies or tones fall victim to the damping forces except for the very few that have just the right frequencies (those that have nodes on either side of the string).  These are the resonances: pure and clear and loud.  So too, images that resonate with sacred memes are the ones that effect us the most strongly.

And while we seek and gravitate towards those memes that are particular and defining of our own individual culture, we search forever for the universal memes, those that define what it fundamentally means to be human.  Some years ago I visited Chartres Cathedral and I was amazed to see a stained glass window depicting a man with a tree growing out of his loins.  It struck me at the time that this was an image depicting Vishnu living in a lotus blossom that grew out of the navel of Brahma.  Each night the lotus would close up.  Each morning it would open up again.  A life had passed.  I wondered why was this Hindu meme to be found at this holy christian site.  Of course, that wasn’t it.  It is foretold in Isaiah:

“11:1 And there shall come forth a rod out of the stem of Jesse, and a Branch shall grow out of his roots:

11:2 And the spirit of the LORD shall rest upon him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and of the fear of the LORD.”

This is the lineage of the Christ.  But you see, the meme of the world tree the central axis of the world is one of those universal memes.

The Cathedral of Chartres is one of those truly amazing universally sacred places.  Needless-to-say, I didn’t take any photographs that day.  If I had been a better photographer, I might have found a way resonate my images with all of the sacred universal memes that define that site.  I was in awe.  And the great Hebraic scholar Joshua Abraham Heschel (1907-1972) has taught us to look for the sacred in the awe.

 

Images of the Challenger disaster – becoming sacred

Figure 1 - The Challenger Disaster. Photograph from the Wikicommons and NASA in the public domain.

Figure 1 – The Challenger Disaster. Photograph from the Wikicommons and NASA in the public domain.

On January 28, 1986, I had gone with a friend and colleague to lunch.  We had gone a bit early because we wanted to watch the space shuttle take off.  What we saw, what we will never forget, it is the image shown in Figure 1.  Seventy-three seconds into the flight the Space Shuttle Challenger blew up, killing all on board.  If ever an image was a meme,  this is it.  Whenever you mention the disaster by name, this is the image that comes to mind.  I think of those people and the terrible experiences they went through.  It is one of those shared gruesome and terrible moments that haunt the collective memory of our culture.

That night, President Regan went on television to speak to the nation and he said something truly remarkable:

“The crew of the space shuttle Challenger honored us by the manner in which they lived their lives. We will never forget them, nor the last time we saw them, this morning, as they prepared for their journey and waved good-bye and ‘slipped the surly bonds of earth’ to ‘touch the face of God.”

Regan associated the image of the disaster with our image of God.  He associated the image, associated the meme, with the sacred.  He elevated the ordeal of those lost souls to an epic plane. And now whenever the subject of the disaster is mentioned not only do I see that image and think about the astronauts and their suffering, but I hear those words, and I try to imagine the image or meme that those words create in my mind, in our collective minds.

We have a set of memes in our culture that define the sacred.  And whenever an image, a photograph, touches upon the sacred, it is elevated.  It resonates with what is most deeply human.

Image and memetic evolution

In yesterday’s blog, I discussed the parallels between memes and genes.  I spoke about how memes are shared and spread.  I also spoke about the role of photographs both in the acceleration of the memes they represent and in the maintenance of their fidelity.  So wait, memes are shared, they spread,and they mutate!  This is to say that memes are self-replicating and that they evolve.  The evolution of human culture is driven by memes, just like the evolution of species is driven by genes.

The important point is that human beings have evolved a whole new form of evolution.  They are no longer strictly held captive by genetic evolution.  Primitive man developed a simple tool, say a sharpened rock.  Each individual from each generation didn’t have to come upon this meme himself.  It could be past on, replicated, between individuals and across the generations.  The meme “tool” evolved until we find ourselves no longer banging rocks together, but rather banging away at the keyboards of our computers.

Some have argued that it is not speech, nor language, nor the size of our brains that separates us from other animal species, but rather our development of a whole new form of evolution that frees us completely from the slavery of genetic evolution.  This has always struck me as a bit self serving and arrogant.  Are we truly different from other species in a way that truly sets us apart? As we pollute our planet and slowly raise its temperature, as we approach that point when the ocean currents that control our climate will shut down, I think that the jury remains out as to whether we will, as all other species, eventually go extinct.  However, the powerful role that memes, and images, as a dominant form of meme, play in our lives and culture still ring true.  They have given us the ability to develop technology at breakneck speed.

So we start to see why human connectedness in a digital age, where images can and are shared at blinding velocity, is such a force in our lives and cultures.  Images as memes are unifying.  They connect us with what is our common perception.  Herein, I believe, lies the meaning of image and photography.