Color Saturation I just upgraded to the Digital Rebel XT, and I noticed that my images (i usually shoot at ISO 100 w/a polarizer) are a little bland in the color saturation department. I have the camera set to Adobe RGB and am using photoshop to process the images (I usually shoot the high-quality JPGs), but I'm frustrated that the only way to get the color to match what I'm truly seeing in front of me is to pump up the saturation levels in Photoshop. I'd like the camera to capture that in the first place. Is there a trick to getting the digital rebel to do this, perhaps somewhere in the setup menu?

ISO refers to the sensitivity your camera has to light when taking a photograph.

A lower ISO value is generally better as a high ISO value can reduce the quality of an image and cause it to appear grainy or noisy. Therefore, you should always aim to use a low ISO value. When outdoors in a bright light, an ISO value of 100 or 200 should be fine.

Higher ISO values can be used in situations where, perhaps, you are indoors, there is low light or you cannot use a flash. A higher ISO value such as 800 or 1600 can be used to compensate for the lack of light and it will brighten the image for you. A high ISO value can also be used if you wish to create a grainy effect in the image but this can be easier to achieve afterward on a computer.

Comparing Nikon to Canon or Canon to Nikon is like comparing Ford and Chev. They both do the job some swear by Chev while others swear at them same with Ford. Yes I've noticed a slight red bias on my Canon gear but nothing that can't be corrected with a proper white balance. To me Nikon had a more unflattering skin tone and I was and still do tweak the color in an image editing program.
I use many different digital cameras in my work and personally own four different major manufacturer digital camera systems.

There isn't enough light for that scene. 1/13th of a second is the fastest at that ISO (automatically set by camera in Basic Mode) and Aperture (auto set by camera too, in Basic Mode) that the camera can handle to provide a reasonably exposed image. Try using Tv on the Mode Dial, set a higher ISO (trade off is image noise) of around 800-1600 or even 3200 if available on your camera. Set shutter speed at 200-1000 (1/200th to 1/1000th of a second) and see if it freezes your subject. An external flashlight with hi-sync mode would help in this situation if the subject is not too far away.

Hello parr_alp,
Please keep in mind that when shooting in low light, you will ALWAYS get some amount of blur when you are hand holding the camera unless you use a flash. The only way to increase your shutter speed is to crank up your ISO setting to 800, 1200, 1600, etc. If there is no tripod handy, brace yourself against a stationary object and remember to keep your elbows tucked down near your body when shooting (no sense in holding up your arms, too).
There is no way to increase the ISO limits of your camera while maintaining quality of your images. And once again, you will ALWAYS get a certain amount of blur when hand holding the camera. 
The external flash not firing is an entirely separate issue. This could have to do with your metering, a bad flash, bad connection in the hot shoe, what shooting mode you're in — the possibilities are numerous. The next time your flash doesn't work, write down all the settings of your camera and keep track of them (i.e. shooting mode, metering mode, flash settings, current lighting situations, etc.) You may start to notice a pattern and perhaps we can help you here.
Anyway, happy shooting, and if this response was helpful, please rate it! Thank you!
Jeff

First, to test be sure you are in Automatic mode. The dial should be on the Green Box setting. If its on other settings its in manual mode and can be set wrong. take a test picture in this mode, If its looking normal, then you were either int he wrong mode or your manual settings were off. But if they are still dark try your ISO settings, if too low a number it will result in dark images. For example ISO 100 is perfect for outdoor daylight, but ISO 400 is better indoors.

Next try the F stop settings and arppreture. If things improve, you have found the issue. This camera is professional grade so it will do exactly what its set to do even if the outcome is not what you want!

Whe all else fails use the menu and reset the camera to factory defaults.

Use the diopter adjustment to refocus the viewfinder to your eye.

Point the camera at a sign or something with writing on and half press the shutter button to focus then move the little adjuster at the top right of the viewfinder until the image in the veiwfinder is in focus

HI ,need to adjust in the day time adjust day light icon, if when night time need to camera in the presence of bulb need to ajust bulb or flourescent. so that it make shaper image also in iso im use 100 iso also ca observe in group picture have a\djustment for a group just navigate the good idea or advance technic og photography.

If you're talking about seeing the image prior to taking the picture, like on most point and shoot digital cameras, that is NOT a function available on the Digital Rebel, XT, or XTI.

when you use high ISO like 800-1600 it will create big novice on image, and when you using law ISO it will be dark for sure.
so the solution is switch cam to TV mode and put into very law shutter speed and use ISO 200-400,make sure you are connected to tripod or else you will not get fine results with law shutter speed. point is when you use law shutter speed camera will take more light to censor even with law ISO your images will be perfect.

sounds like me rebel xt, mode dial is bad, can you change speed?