Hi i just read an interesting article on HDR in the Sept/Oct edition of Digital PhotoPro, and am still left with some questions. Although the article explained WHAt HDR is and how the math works behind it, im still confused as to how i shoot in HDR, or is its something i can convert to(i dont think this is possible, correct me if im wrong).
I believe you just do several exposures (with a tripod) to properly expose the different parts of your scene, then put them into photoshop and use HDR conversion to let photoshop put all teh properly exposed parts of each picture together to make one pic that is properly exposed throughout...
I Think that is right... please correct me if I am wrong =)
The easiest and most straightforward way to utilize HDR is to take multiple photos of the same image at multiple different exposure levels. This can range from three to more than seven depending on the amount of detail you want to pull out. The images are then combined usually in a program such as Photomatix Pro or CS3 and are then blended together to bring out the details in the dark areas (overexposed images) and to tone down the blown out sections (underexposed images).
A single RAW file can also be tonemapped and this provides a similar feel and look to HDR where it pulls the extra details out of the dark areas in the high resolution RAW file and tones downs the bright areas.
In your xti and there is a setting for "exposure bracketing" select it and roll you wheel until you see three green lines one in the middle one on the far left and one on the far right. set up a tripod and hold down the shutter for three clicks. After the third let go and look at your pics making sure you have a properly exposed one, a dark one, and a light one. Then load them up into "Photomatix", there is a free trial version online, and follow the instructions there.
its CS2 useful in this at all? how much does the photomatrix cost? is it worth using the trail just to fall in love with it and not be able to pay for it?
its CS2 useful in this at all? how much does the photomatrix cost? is it worth using the trail just to fall in love with it and not be able to pay for it?
You can use CS2 as well using blending of layers etc. I dont' recall if it has an HDR function.
Go check out Photomatix's website for the price (I forgot what it costs) and a quick free demo trial - you will most likely love it and want to buy it.
Read the manual - there will be a section on Automatic Exposure Bracketing - AEB. This is the function you want to know about and it is not a 'custom' function. I strongly recommend using a tripod, but depending on exposure level and personal shakiness it may not be necessary.
You also need to use self timer in order for exposure backeting to work. (assuming the XTI works like my XT in this regard) bracketing won't kick in under normal shutter presses.
You also need to use self timer in order for exposure backeting to work. (assuming the XTI works like my XT in this regard) bracketing won't kick in under normal shutter presses.
i put my camera on the setting where it takes photo after photo with one shutter click(brain fart, i cant remember what that setting is called) and the HDR worked fine.
Hope it does what you need, it's just something that happened to be on my flashdrive. Is this part of your HDR experiment,or for something else?
i was just planning on using it for learning purposes while im in yearbook everyday. i want to become pretty good with photoshop, and i want to learn more about HDR. so thats about it:)
Can anyone please explain to me the math behind "Merge to HDR" in photoshop. I mean how does it work is it like averga ethe pixels or what please you help
