SLR camera with characteristics for taking HDR pictures?

I'm beginner, but I need a camera réflex digital with the characteristics to take HDR potos, meaning with different exposure levels. I understand that there are different characteristics for doing that (autobracketing, shutter speed, F-stops, remote control, etc). I don't want to buy something so specialized since I'm beginner. What I've seen so far: Nikon D5100, or Canon Eos Rebel T4i. Any other suggestion?

You really DO want auto-bracketing to do HDR. The two cameras you mentioned are great choices.

There are many cameras available in the market which are really good for taking HDR photos with different exposures and which are really for the beginners the way you are. Among those cameras you have mentioned two of them which are good cameras but definitely one is better than the other which Nikon D5100 so I would good with Nikon D5100 because it has good features like:

Low noise at 1, 183 ISO
Great image quality with 80.0
Great color depth with 23.5 bits
It has Wide dynamic range with 13 EV
It has flip-out screen which is really helpful for movies
And large sensor of APS-C 23.6x15.6mm

Look at D5100 for further details:

http://www.amazon.com/...004V4IWKG/

The other features which makes it different from Canon T4i are:

Significantly lower noise at high 1, 183 ISO compared to 722 ISO so it has slight edge in low noise
Much better image quality with 80.0 compared to 62.0 which means around 30% better image quality
Better color depth and more dynamic range
It has significantly larger sensor APS-C 23.6x15.6mm compared to APS-C 22.3x14.9mm so it has more than 10% larger sensor
Longer battery life with 660 shots which is 50% more shots per battery charge
It has slightly less startup delay and more focus points which set focus accurately within the frame

So overall Nikon D5100 becomes better to go for. Also it is really helpful to know what actual user think about the product they are using. So here is a comment an actual user for that purpose:

http://www.amazon.com/...39XVQCDBJ/

Pretty much every camera on the market that allows for adjustment to the exposure will allow you to take HDR images. Some cameras make it easier than others, but all you are doing is combining the properly exposed parts of multiple images shot at a range of exposures. Autobracketing is the easiest way to do in with a dSLR, and they pretty much all do it.