channel mixer – Damien Demolder

The power of eye contact – Dean looks up

Catching the attention

I had been asked to take pictures at a First Holy Communion by the father of the boy in this picture. I’d done all the usual shots and had more than enough pictures to keep daddy happy. With the job safely covered I was able to hunt out some different angles, and to take a few risks that may or may not have paid off.
I’d reckoned the organ loft would produce a few good pictures anyway, as I could get the children posing for the congregation at the end of the service, and get that wider view to include the families and guests crowding round to give a fuller account of the story. I used a focal length to just include the kids at first, as I wanted to catch some of their excitement and their interactions with each other. For many of them this was the first special occasion in which they had been the centre point, so they were buzzing.
As I framed the group the boy in the middle, who was my subject, looked up and saw me above him. As his eyes met the lens I checked the focus was right on him and I took the shot. All I got was the one frame, as he quickly reverted to facing forward at the crowd of other picture takers.
I hadn’t known that he would look up, and if he hadn’t I’d have just got some nice pictures of the whole environment, but because I was there and ready, when he did look up I got a picture that I couldn’t have prayed for.
His eye contact demonstrates how we react to other humans. The eyes make us look at him first, and we find it hard to look away for a while. We do, and we investigate all the other things that are going on in the frame, but the first and the last things any viewer will see are those eyes. They are only small in the picture, but their power is undeniable.
As usual I shot this in colour, and converted the file to black and white using the Channel Mixer. The more detailed channel is always green, and its more moderate contrast suits this subject very well. I tempered the bias to green with a touch of red and some noisy blue, but the green channel accounted for 80% of the information.

Colour toning for reality – Palm Tree Reflections

Palm Reflections

I took this picture of palm trees reflected in a swimming pool on the last day of a two-week trip to The Dominican Republic. For the whole fortnight I’d been taking pictures of the beach, the blue sky, the swaying palms and all sorts of views and scenes that to me typified the sense of the place. In the end though, looking back over them as the end of the trip came in to sight, I wasn’t convinced that I had really captured what it all meant to me. I had some great images, even if I say so myself, that were laden with messages and atmosphere, but I hadn’t made the shot that reflected my own personal experience of the country or what I would want to remember most.

Sitting by the pool after another excursion along the coast to take more pictures I was wondering what it was I had liked the most about the place and what view I would want to take back with me to remember. It had been a very relaxing trip that was very much needed at the time. I’d been knackered before we left home, and it had taken several days of doing nothing and pure relaxation to bring me around to a normal human state. Work had been pretty hectic and long days had been running into late nights and early mornings, and I’d needed this holiday.

Sitting there, drinking up the atmosphere I realised that what I’d enjoyed most was staring back at me. The reflection of the palm trees in the rippling surface of the water, and the deep blues of the sky enhanced by the blue tiles of the pool’s floor. It is the kind of view you can sit and stare at for hours with nothing going on between your ears.

Adding the right colour

I made this image to include enough pool edge so that it could be seen to be a pool but with the majority of the frame occupied by the palm reflections and the lines of the tiled floor. I shot in colour, of course, as one would with such a scene, but was surprised when reviewing the images later on at home that the blue I remembered was not as dominant as I had sensed at the time. I resolved this issue by taking a sample of the blue that I remembered from the image using the sampling tool and then switched the colour file to black and white. I did this using the green channel, in Channel Mixer, and then used the Curves tool to lift the contrast a little. Next I created a new colour fill layer, which I flooded with my watery blue, reducing the layer opacity to 10% to allow the detail of the scene to show through.

The final result is not actually a technically accurate representation of the scene I shot, but it is an extremely accurate representation of what I saw, of what I remember and of the essence of being there, in that place at that time. The camera never lies, of course, but it is a dumb instrument that is not capable of understanding emotion and the way the human eye filters what it sees. The camera often needs help to make a picture that conveys what is happening in the mind behind the viewfinder rather than in physical form in front of the lens – and it was one of those occasions.

Samsung GX20 with Pentax SMC FA 43mm f/1.9 lens. ISO 100

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Palm Tree reflections - the original version

Palm Reflections

Back lighting graphic shapes – Bus Stop girl

Backlighting • Graphic shapes • Channel mixer • Cropping

The best way to show graphic shapes is to reduce the scene you are photographing to its most basic and fundamental elements. In this case that reduction process meant removing the colour and producing a level of contrast that would show exactly the lines and curves that caught my eye in the first place. I couldn’t control the light, obviously, and the scene only worked from one angle, but it is the element of back lighting that really helps, even in these overcast conditions, to create a semi-silhouette of the bus stop structure and the waiting woman. So I got lucky.

The backlighting reflects off the road and the pavement, making both brighter than they would be from any other angle. This backlighting has also brought out the pattern of the paving and has emphasised the straight edges between each slab. This creates a mass of lines travelling towards the camera and which also lead the eye back into the picture.

Contrasting shapes
The woman stands out as she is the only element in the scene not made up of straight lines, which makes her come forward as the obvious subject. Even the roof of the shelter, which we know is curved in reality, is represented here by straight and solid edges. The only random shapes are made by the pigeon about to land, but as that is quite hidden it doesn’t take too much away from the subject.

Contrast
Having shot this with low contrast settings in-camera I took the image into the Curves and created enhanced mid-tone contrast to strip out some of the image’s greys. In Levels I enhanced the blacks, and reduced the highlight output to inhibit true whites and to soften the visual effect.

Keeping it level, and cropping
At the time of shooting I was very careful to keep all the uprights absolutely straight and level, as they are an essential part of the picture. If you find yours are not quite straight they will distract the viewer’s attention and make them miss the point of the picture. I know I say it a lot, but keeping uprights completely upright is so important.

The last thing I did to the picture was a crop it to 5x4in proportions. I chose this format as it has a classic feel that introduces a quite formal atmosphere that compliments the neat and rigid linear structure and patterns of the scene.

Choosing the moment
Picking the right moment is especially important in this type of scene, as we want to keep things as simple as possible. With people and cars in the background the scene becomes cluttered and we loose the sense of what the shot is supposed to be about. With all these extra shapes that over lap it becomes difficult to see the woman, the back lit road is blocked and the pavement falls into shade. Even one additional element is enough to spoil the picture and create a distraction, as you can see from the these additional shots shown here.

About the black and white conversion
I converted this image to black and white using the channel mixer tool in Photoshop. I chose to use the green channel as it produces the more moderate contrast of the three available. The red channel showed blown out highlights, as does the blue channel. The green channel is also the sharpest and more detailed, and it displayed the right tonal differences between the coloured elements in the scene to make hedges and the grass verge stand out.

Sony Alpha 700, with DT 16-80mm F3.5-4.5 ZA Carl Zeiss Vario-Sonnar T*.

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Black and white portraits – blue channel man

Using filtration in male portraiture • channel mixture conversions • shooting in colour for a black and white result

We automatically think about using channel filtration to create black and white images when we are shooting landscapes, because we are all used to the idea of fitting filters for this type of subject. The reference pictures that stick in the mind that demonstrate what filters do to monochrome images – the deep black skies and fluffy clouds of the red filter – are generally landscapes in which we can see how blues darken and green grass lightens. In fact, you probably wouldn’t shoot a black and white landscape without thinking about filtration.

We don’t associate lens filters with portraiture in the same way, unless warming or adjusting a colour picture, but sometimes red filters are used to reduce the effects of skin blemishes. With this in mind when converting a colour portrait image to black and white I often use a red channel bias in Channel Mixer (Image>adjustments>channel mixer) to lighten the redness of spots, skin patches and veins close to the skin surface. This looks great for women, as it can leave a flattering facial glow as well. But it really doesn’t look macho enough for portraits of men.

I have found the channel that delivers the more manly effect is the blue channel. It adds depth to the skin and presents a more tanned, or weathered, look (I know, but you can still see it in black and white!). The blue channel makes men look stronger and more heroic, which I think is what most men prefer. And the deeper and more complex shades of this kind of conversion provide the ideal base for adding a colour tone too. There is so much more grey in black and white images converted using the blue channel that toning and staining colours have much more impact.
If you find a blue channel conversion produces too strong a result remember that you don’t have to use it on its own. My favourite channel of all is the green channel, as it has lower contrast and better sharpness than red or blue, and I like to mix it in with the others to rein in any over-blown effects. Try mixing 50% green and 50% blue for a more restrained image.

Obviously to make use of these effects and options you need to be shooting your portraits in colour. I find that shooting everything in colour gives me the most flexibility, so I shoot in colour even when I know I will only want a black and white final result.

Nikon D40 with 55-200mm f/4-5.6G IF-ED AF-S DX at f/16 and ISO 200, with Bowens flash heads.

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The final version of the portrait convertedto black and white via the blue channel.

The deeper tones of the blue channel conversion make a better base for accepting sepia and other colourised effects.

Patterns and shapes – Muzeum Techniki

This ship’s propeller really caught my eye as I walked around in Warsaw, Poland, as its curved form is surrounded by a mass of squares and triangles.

Much of Warsaw’s non-modern architecture is based on right angles and straight edged shapes with few curves or circles. Although I suppose I hadn’t really made a mental note of that fact, when I came across this object, that has no straight edges at all, I was quite struck with it. In taking the picture I wanted to get over the contrast between the roundness of the propeller and the sharp edges of the notice board next to it, plus the visually powerful squares of the walls behind it. It was only when I looked through the camera that I noticed the blocks of the car park and the lines painted on the floor. These were something of a visual bonus.

At the time I had a wideangle lens on the camera and this is what I made the first pictures on. Viewing them on screen I realized that I wasn’t getting across the strength of the squares, as being close enough to fill the frame was creating too dramatic a perspective, which in turn distracted from what I really wanted to show. Instead I fitted a more standard lens (in this case a 28mm on the APS-C camera). This meant I had to move further away, which helped me to include more of the ground and those lines, plus it flattened the perspective. Moving away also meant I would have to worry less about the lens distorting the brickwork into curves rather than those strong straight lines.

Keeping the camera absolutely level was essential for the graphic and purposeful image I wanted to create, and keeping a wide aperture would allow the propeller and the notice board to stand out from the background, while still retaining enough focus in the brickwork that the shapes could easily be seen. I didn’t have a tripod with me at the time, but I wished that I had. Although the shutter speed was short enough to hand-hold the camera without fear of camera shake, mounting on a tripod makes getting everything right-up and level so much easier. In the end I took about six pictures before I was satisfied that I’d got what I needed.

Fortunately the day was overcast, so the reduced contrast of the softer light allowed me to show the three dimensional shape of the propeller without burnt highlights or overly dark shadows. The soft contrast also helped to display all the fine detail in the stonework, the notice board and the car park.
Originally shot in colour, I converted the picture to black and white via a channels conversion, using a combination of green and red channels. The green channel gave me fine detail, while the influence of the red channel boosted the contrast of the scene a little.

I didn’t have to do too much else to the image, other than some minor curves adjustments and then some unsharp mask to finish. The exposure was already quite dark, which I think adds to the atmosphere. The place the picture was taken is quite hash and serious, so making a jolly picture would not have been appropriate.

Pentax K10D with 50mm manual focus lens, 1/80sec @ f/2 and ISO 400

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Forecast
Satellite

Real-life perspective – Squeeze box man

The idea of street documentary is to show the viewer what it is like to be in the place you are shooting – and to experience the things you are experiencing. To do this I try to shoot with a perspective that delivers to the viewer a feeling of being in the place rather than simply observing it from afar.

The simplest way to begin this process is to use a lens that captures an angle similar to that which the human eyes can see. Although a 50mm lens is seen as ‘standard’ for the 135 film format and full frame sensors this is still slightly long for a realistic view. On these formats I try to use a focal length of between 30-40mm, which is the same as between 20-30mm for cameras with an APS-C type sensor, and between 15-20mm for FourThirds users.

When you use a lens like this for the type of portrait shown here you have to forget your inhibitions and move in close. This chap was more than happy for me to take his picture, but I still asked by showing the camera and expressing my intentions. This is done in a split second through facial expressions, but makes the difference between guarrenteed co-operation and comfort, and not quite knowing how the subject will react once you start shooting. Having permission also improves your chance of getting good eye contact.
The accordion player was sitting down so I crouched to get on the same level as his chest, and so I could make a major feature of the instrument. It looked almost as old as him, with just as many lines, contours and interesting features.

The day was very overcast, so I didn’t have any trouble with contrasty light and shadows blocking up his eyes or shading his face beneath his hat. It also meant that exposure was easy, and I could leave the camera’s evaluative/matrix system to do the work for me.

I shot in colour as usual, but knew this one would end up in black and white. The conversion was made using the green channel – a favourite with me for getting an aged classic look.

I cropped square as well to keep the composition tight, and because the format seems to suit the shot well.

The final image has good depth and possesses a three dimensional effect that I would not have achieved had I stood back and shot with a long lens. While long lenses allow you to keep a distance, they always show that you were a long way from the subject – which makes it difficult for the viewer to connect with the subject. Actually getting close yourself makes a massive difference, and can be the difference between getting an ordinary shot and one that has some impact.

Shot with Pentax K20D, with Sigma 10-20mm f/4-5.6.

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B&W conversion – Green Channel

Colour images converted to black and white using the green channel have quite a distinctive look that is great for creating the feel of all classic images. In the days before panochromatic emulsions black and white films had no sensitivity to red (they could even be developed with a red light on in the darkroom).

Film was mostly sensitive to green light, and pinky reds recorded as black, and greens as bright tones. In most normal scenes though pictures record with a moderate contrast that makes a nice change from the over blown black and white work that is widely popular among enthusiasts.

There are two principle ways of creating a conversion using just the green channel – you either isolate it by deleting the red and blue channels, or go into a channel mixer tool to effectively turn off all but the green. Either method delivers much the same result.

Green channel conversions are great for all sorts of subject types, but I especially use it for portraits and city scenes when I want pictures to appear older than they really are.

As digital cameras has twice the number of green pixels as either red or blue you will find that green channel conversions present the absolute best you will get from your camera. Resolution and image detail is optimised, and image noise will be at its lowest.

Filters V channels

If your camera has a black and white mode you may have wondered whether it is better to shoot using this mode and coloured filters over the lens, or whether to shoot in colour and convert using a colour channel mixer or selector in software. You may find that most people will tell you that essentially the two methods add up to the sdame thing, but that one involves putting a piece of glass or plastic over your expensive lens which might degrafe your image quality. Actually there is a difference, though it is quite a subtle one.

If we compare digital processes to the days of film shooting with filters is just like when we shot with black and white film and filters, but when we use channel mixer tools it is like changing the characteristics of the film. Digital sensors are panochromatic – that is, they are sensitive to red, green and blue light. When we use a single channel by itself we are effectively altering the sesnitivity of the sensor. Using only the green channel makes the sensor behave as orthochromatic film, and using only the blue makes the sensor xyxy. When you put a filter over the lens you are still using a panochromatic sensor but you promote one colour and hold back another. The effect is quite different, as is the principle. Using a filter over the lens with a panochromic sensor will always produce a more extreme result, that can only be matched in magnitude in software by extensive manipulation that degrades the image.

This picture was taken using the Olympus E-3.

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Capturing movement – Blue Bamboo

These are not my bamboo plants – they belong to my wife. But I’m the one who chats to them, waters them and feeds them. They’ve grown really tall, and when the wind blows across the garden they lean right over and sway around. I love listening to the sound of their dry leaves brushing together – it sounds like the sea – and watching the sun sparkle as the canes and leaves alternately block it and then let it through.

For this shot I wanted to capture the movement of the leaves and the canes on a windy day. It doesn’t take much wind to make them move, but as they are quite rigid, and they block the wind as well as dance in it, some parts of the plant move more than others. It seemed silly to shot on a tripod when capturing movement like this, so I shot hand-held and made the most of the freedom to try lots of different angles.

As it was a bright day, I needed a small aperture to get a shutter speed long enough to show the movement. In the end I settled on f/16 and shutter speeds of around 1/15sec. The shutter opening was enough to show the movement in some areas and a degree of sharpness in others, which then allows the picture to explain more clearly what was going on. The leaves, which were fluttering very quickly, have become very blurred, but the gently swaying canes are quite well defined.

I shot in colour, but knowing that I would convert to black and white afterwards. I wanted to use a green filter to lighten the leaves and to create contrast with the darker canes, but a physical glass filter would have created too much flare – I was shooting into the light.

The same shot in colour I converted the picture to black and white via channel mixer – using just the green channel – and then toned it with this china blue colour. To do this I converted the RGB file to greyscale, and then made it a duotone. I’m not too bothered what colour I choose in Duotone mode, as I always adjust the colour and saturation once the file is converted back to RGB.

Once it was done I went into Levels and moved the highlight output levels to 252 from 255. That just takes the edge off the white background and reduces the contrast a touch

It’s pointless to add sharpening to such a soft image – so I didn’t.

Shot with a Canon EOS 1Ds III, with EF28-135mm f/3.5-5.6 IS – exposure 1/10sec at f/29. ISO 100

If you want to use this same grey/blue for a duotone click the selected colour in the ‘Ink 2’ box and then type bdc6cb into the hex colour box that sits at the bottom of the ‘Color Picker’ window. The hex color box is the one with a # (hash symbol) next to it.

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