Sprockett
12-09-2006, 04:07 AM
Just recently got Photoshop CS2 - amazing program. I love the fact that it will actually accept RAW image files (PS7 didn't). That definitely creates more tweaking possibilities, and an overall better possible picture quality. I'm really interested in learning more about how to effectively make an HDR composition, so if anyone has any idea how to do that I would greatly appreciate the input.
I'm mainly confused on two parts to this process: the different stop exposures, and the PS curve tool.
I need a little bit of explanation on this.
Hypothetical example:
Let's say I'm taking a picture of something stationary, and want to turn it into an HDR composition. If it was metered at f/4.0 and 1/50, would I need to do the following (if something else, please correct me):
for a -1 stop picture, leave at f/4.0 but change to 1/100
for a -2 stop picture, leave at f/4.0, but change to 1/200
for a +0 picture, leave at f/4.0, 1/50
for a +1 stop picture, leave at f/4.0, but change to 1/25
for a +2 stop picture, leave at f/4.0, but change to 1/13
I guess the formula is that a +1 stop is where you are allowing twice as much light than a balanced +0 photo. So, if I kept the f-stop the same, I should have to double the exposure time, correct? a -1 stop is where you allow 1/2 as much light that a balanced +0 photo, so leaving the f-stop alone and cutting the exposure time in half should do that, right?
With an HDR photo you need to take a series of photos of the same thing, with the same f-stop, at different exposure settings...namely with a -2 stop, -1 stop, +0 stop, +1 stop, and +2 stop (and further out than that if necessary). I'm just having trouble figureing out exactly what I should do to the +0 shutter time to create those other stop values.
The curve tool is something I'm just going to have to search around and learn on my own I think. I'm pretty sure this is impossible to teach someone else unless you're here with me.
I'm mainly confused on two parts to this process: the different stop exposures, and the PS curve tool.
I need a little bit of explanation on this.
Hypothetical example:
Let's say I'm taking a picture of something stationary, and want to turn it into an HDR composition. If it was metered at f/4.0 and 1/50, would I need to do the following (if something else, please correct me):
for a -1 stop picture, leave at f/4.0 but change to 1/100
for a -2 stop picture, leave at f/4.0, but change to 1/200
for a +0 picture, leave at f/4.0, 1/50
for a +1 stop picture, leave at f/4.0, but change to 1/25
for a +2 stop picture, leave at f/4.0, but change to 1/13
I guess the formula is that a +1 stop is where you are allowing twice as much light than a balanced +0 photo. So, if I kept the f-stop the same, I should have to double the exposure time, correct? a -1 stop is where you allow 1/2 as much light that a balanced +0 photo, so leaving the f-stop alone and cutting the exposure time in half should do that, right?
With an HDR photo you need to take a series of photos of the same thing, with the same f-stop, at different exposure settings...namely with a -2 stop, -1 stop, +0 stop, +1 stop, and +2 stop (and further out than that if necessary). I'm just having trouble figureing out exactly what I should do to the +0 shutter time to create those other stop values.
The curve tool is something I'm just going to have to search around and learn on my own I think. I'm pretty sure this is impossible to teach someone else unless you're here with me.