When on automatic my xt20 only takes dark pictures

Question edited for clarity and toss in some CAPS.

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First, I suggest you look into the camera lens. Perhaps it is not clean? Next, how does the preview image look before snapping the picture? If the preview is good then the problem may be in automatic post-process settings.

Don't know what exactly the issue is, but digital cameras these days all have a setting to adjust the aperture. If a picture is dark, you can change the setting to have the aperture open for longer (this lets more light in). It wouldn't be an automatic setting, unfortunately, but this is something you have to do anyways when its dark outside and you are taking pictures at night. Just make sure you steady the camera (if the aperture is open for very long, then you may need a tripod) when taking the picture or else it will be blurry.

What mode are you shooting in? It seems you may either have your shutter speed set manually to a slow speed or, alternatively you have set your apperture set to a high number e.g f/20 or there abouts. Because this is a very narrow apperture the camera will compensate by using a slow shutter speed.
Try some shots in fully automatic mode and see what happens. With a slow shutter speed you can expect any movement to produce blurred images.

Was everything set automatic?
Was it a cloudy day?
Did you take pictures in the sun of an object in shadow?
Are your indoor pictures normal?
If you are sure everything was OK, no shadows, no bright objects in the picture, ISO was not set 400, flash was not forced on, etc., call Canon. There are adjustments that calibrate the camera for outdoors. It may need to be recalibrated.

Before you shoot, try pressing it half-way so the camera can take information how dark it is, then press fully to take the picture. Do this every time you shoot, half-press for a second, then full press to take the picture. If this isn't rectified, check if you have custom ISO settings in the camera, set it to the highest possible value.

If the automatic flash settings detection is on where possibly isn't dark enough.. Try to go into a completely dark room and see if it works.. If it still dont work try and check the camera settings..

Hello did you try brightening the frame rate of the camera?? and the quality of the picture?? That usualy would help..

Hi, I guess you are using the automatic mode ( not the "P" mode).
You should enable flash only when there is insuffient light. If you use flash in broad day light, your pic will be whited out. If you dont use flash in dark or low light, your pic will be dark or very dark.
So, when it comes of dark, try enabling the flash. If its still dark, increase the flash compensation (the eV value). If its still dark, increase the ISO number.
Hope these help.
cheers,

The settings in Auto Mode are factory set. If you want to adjust exposure and shutter speeds then you will have to shoot in Manual Mode (TV=Shutter Priority, AV=Aperture Priority, M=Full Manual)