Read also: Strobist seminar momento at CERN near Geneva - experience Strobist Lighting 101 Lighting

David Hobby (aka Strobist) began his lectures at CERN near Geneva with a brief review of techniques momento to illuminate showing momento examples of their photos, including a photo professor at the background of three-dimensional particle simulator. Immediately make the connection that that is exactly the same technique can take a picture momento of David on the background of the images displayed projector.
The task proved a little more difficult than I thought. Firstly, the room was very dark, so I had to use the flash. The second room was lit greenish fluorescent. Thirdly overhead was low power, and if I tried to take a picture using the flash on the camera, the picture for David would not be visible. Fourth, David did not want to cooperate.
Problem number one: a dark room. It was obvious that I need to use the flash, but the light could not fall on the slides displayed for David. The solution was simple: momento enough to put a lamp on the right side of the camera and put the whole snoot setting so that the light beam fell only David bypassing the screen.
Problem number two: the greenish fluorescent light. I could not get rid of it completely (by setting momento a short time and / or large aperture) because with him perished me a picture from the projector. The obvious solution, though simple, proved not entirely effective. I thought that you just bet on the lamp green filter (Eng: Window Green), to balance the green fluorescent and working to align the colors white balance. However, the alignment of the white balance also change the colors displayed for David picture. I had to compromise and leave a little bit of green in the image.
And one, as it turned out the biggest problem: the model does not want to cooperate. David has performed in front of an audience pięcidziesięcioosobową momento and had no intention to facilitate my task. I had to rely on fate and wait for David will be reduced, in the light beam by the snoot. She checked the hammer method: make 1000 photos, and either will be successful. Hmm ... I have not done them so many and optimize the process of waiting for David to move into a zone of light, but still it was a matter of trial and error. The greater the number of times you can see on flikrze momento - Strobist at CERN.
I could, for example, put a second flash with a snoot on the left side of the camera and light the David of the two sides. I could also ask for switching off the fluorescent lamps. And in the end I could ask David about posing.
Read also: Strobist seminar momento at CERN near Geneva - experience Strobist Lighting 101 Lighting 101 Strobist ready - soon publication Strobist Meeting in Silesia Questions backpackers - color temperature, Headlights under the sun, HDRy one Rawa and more - Podcast Strobist momento Lighting 101 ready for download
Remedy 2 - layer masks fit in the shed doing selection (in any way, as far as who can and have the time) of the corresponding element of the image. - Http://allegraf.pl/inne/1.jpg Click the black and white circle at the bottom of the tab "layers" - http://allegraf.pl/inne/2.jpg choose an appropriate adjustment layer. For correction levelsy, curves, color balance or whatever, special effects whatsoever. momento We're shooting sliders. momento The effect can be changed by clicking on the first symbol next to the mesh in the layer hierarchy. Artistic effect - http://allegraf.pl/inne/3.jpg
The first 2 levels on 2nd picture is an adjustment momento layer. Rectangle before the name of her mask layer, hence the name. You can modify the mask by painting it white or black brush (gray for informed what they do) after selection. You can also make selections and fill them with white or black color. After modifying advise to make sure that the layer mask is no longer active, so there was no oddities. As one who wants special effects that can change the way of penetration.
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