12.2 Megapixel APS-C Size CMOS Sensor

14-bit A/D Converter
With the EOS Rebel XSi, analog to digital signal conversion is executed by a 14-bit processor, which generates digital data with incredibly smooth tones. Formerly a feature only present in top-of-the-line pro digital SLR cameras, the 14-bit conversion gives incredibly smooth transitions from light to dark colors, with far less risk of "banding." A sky at sunset is a perfect example. With this rich 14-bit gradation the EOS Rebel XSi offers RAW images of the highest quality that can be processed with Canon’s Digital Photo Professional software. Even JPEG files, which are always finished at 8-bits per channel, use the full 14-bit conversion initially to generate the best possible color and tonal detail. Another huge benefit of the 14-bit conversion is the Highlight Tone Priority option, which allows critical shooters to increase the level of detail in bright areas of a scene up to one stop, without affecting overall exposure.

Auto Optimization
The EOS Rebel XSi’s Auto Optimization is yet another image-quality tool that comes to the rescue in tricky lighting conditions. It can actually lighten dark areas of a scene while ensuring that bright areas maintain tonal detail. It’s now available in all shooting modes, including P, Tv, Av, and Manual.

DIGIC III Image Processor
Developed to maximize performance between the capture and recording stages of digital photography, the EOS Rebel XSi’s latest-generation DIGIC III Image Processor works in concert with Canon’s CMOS sensor to achieve even higher levels of performance. The entire electronic system is totally redesigned, giving the camera its incredible combination of speed and image quality. Digital noise is significantly reduced in shadow areas, and color reproduction is superior.

DIGIC III Image Processor

3.0" LCD Monitor

Live View Function
Live View Function enables you to view your subjects directly on the huge 3.0-inch LCD monitor. It’s easy to magnify any part of the scene 5x or 10x for precise manual focus. And now, there are two ways to use Autofocus along with Live View Function in the EOS Rebel XSi. You can even choose a grid overlay, perfect for keeping straight lines in your subject straight in your pictures. In the studio, Live View Function can be used remotely via a computer through the EOS Rebel XSi’s USB connection.

EOS Integrated Cleaning System
Photographers who must change lenses in dusty environments will find the advanced Canon EOS Integrated Cleaning System a tremendous time saver. Dust that settles on the sensor surface is removed using ultrasonic vibration. This Self Cleaning Sensor Unit routine is automatically activated whenever the camera is powered on or off. (It can also be manually activated.) A special collar positioned around the sensor collects the loosened dust. Dust particles can also be automatically removed via software. By shooting a plain white subject, the photographer can acquire dust position data that is transmitted along with the image (whether JPEG or RAW). Canon Digital Photo Professional (DPP) version 3.3 or later software can be used to manually or automatically erase the dust spots. It’s not one feature, it’s a built-in system to minimize the effect of dust in high-resolution digital images.

Self Cleaning Sensor Unit

Self Cleaning Sensor Unit
A key element of minimizing dust is preventing it from clinging to the front surface of the imaging sensor. To combat against this, the EOS Rebel XSi features a Canon-designed Self Cleaning Sensor Unit. The low-pass filter at the front of the sensor shakes off dust automatically with ultrasonic vibrations, removing dust from the sensor assembly. The EOS Rebel XSi has a new coating on the front surface of the low-pass filter, to increase its resistance to dust sticking to the sensor.

Self Cleaning Sensor Unit Construction Diagram

Dust Delete Data Detection
Dust that may still remain on the front of the sensor can also be erased with software included in Digital Photo Professional (DPP) Version 3.3 or later software. A simple test shot of a plain, white object can be taken, using a menu setting. This Dust Delete Data image is analyzed in-camera, and the location and size of any remaining dust is added to any subsequent pictures taken. This data is transmitted along with the image, whether JPEG or RAW, and can be either manually or automatically erased in Canon’s DPP version 3.3 and later software. This added software option ensures the cleanest possible image, perfect for printing or archiving.

Picture Style settings
With the EOS Rebel XSi’s Picture Style technology, photographers can change the look of their digital photographs. Color, saturation, sharpness and contrast settings create noticeable variation in the saved image. Changing a Picture Style setting is almost like a 35mm film user switching from one type of color film to another. In addition to six preset Picture Style settings, Canon offers additional downloadable "Picture Style Files", that can be installed into your camera for even more imaging options at your fingertips.

Highlight Tone Priority
This vital Custom Function lets photographers get even better detail in bright highlights, even in contrasty lighting conditions. It’s beneficial for nearly any type of picture, from mid-day shots on a safari to portraits in sunlight, where a user may encounter bright highlight areas where he or she wants to preserve details. Finally, there’s no impact on the camera’s shooting speed or burst rate when Highlight Tone Priority is engaged. It takes full advantage of the EOS Rebel XSi’s new 14-bit per channel conversion, meaning there are 16,384 distinct colors from darkest to lightest in each color channel.