Jackie here with the session on the W Photoshop CS2’s new merged the HDR capabilities. First of with HDR high dynamic range. The idea behind this is that the human eye in our micro processor brain or macro processor brain, can handle the dynamic range between, say the brightest highlights in image, let us say here, and the shadow detail in an image. And no camera even if the camera can, say capture in raw is not able to actually hold this amount of information. Whereas with the HDR file it actually has up to 32 bits of information per channel versus the 8 bits per channel or 256 shades per channel, particular for Jpeg, or 10 or 12 bits of information per channel for typical raw. And HDR file which was originally invented for special effects. Movie special effects, video and 3D animation has the ability to hold 32 bits. Just a ridiculously large zillions of colors is the technical term per channel, and of course those red, green, and blue channel that are combined for some hideously large number, which basically using floating point processing to have something that is beyond what could be seen.
Well now we have this ability to tract this amount of information. How do we grab it? Well we cannot. There is no camera that will actually grab that amount of information. The eye cannot even see it. We always wanted we can see it in the real world things like a bright highlight and mid-tone in shadow detail is because our brain processes it, more able to actually see so quickly and change so quickly that we actually get the impression of being able to see this huge dynamic range.
What are we going to do with this new feature? What we are going to do is we are going to combine multiple exposures and you will notice that there is multiple ways of doing that in Photoshop. Now the great one that is another session on the same disc. But in this case, what we are going to do is I, with the tripod, I actually took multiple exposures each, a full stop apart. Okay, if you are using your exposure compensation in your camera, that is little usually one F-stop apart. You can set that for other settings aside from just once, sometimes it is at third of an F-stop. Adobe recommends you do at least a full stop between each one of these shots. And maybe even more, maybe two. What we are going to do is we are going to do, I have done five shots here. Again, take another tripod so they are in exact alignment. And then we are going to choose some of them. I am not going to use all these. You actually want to choose the fewest number of exposures that you can because what merged to HDR thus it overlaps each one of these photographs. And if they are not in absolute alignment, meaning the best tripod you can with obviously knowing this is a shot indoor in a studio. And I would not even use your bracketing featured in your camera where you are holding down the shutter and letting it shoot on after another as fast as it can because the vibration there take a shot. Change your exposure, you can use that bracketing but take a shot. Take another shot, take another shot, not as fast as you can.
Anyway, what we are going to do is we are going to take advantage of the ability to combine these different exposures, at least one that is going to be exposed for our highlights to maintain all the detail in there. And then several other ones that are going to have the information for our shadow detail in this case, our middle tone details for this flower.
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