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Canon EOS Digital Rebel XT Digital SLR
Canon EOS Digital Rebel XT Image Processing
Improved White Balance
The auto white balance mode has been improved from that of the EOS Digital Rebel camera to make color reproduction more accurate and natural. Moreover, with DIGIC II and an improved algorithm, the white balance is now more stable. Also, color reproduction, especially of natural reds under low color temperature, such as tungsten light, has been improved, as has skin tone reproduction.
The EOS Digital Rebel XT has six preset white balance modes: daylight (approx. 5200 K), shade (approx. 7000 K), cloudy (approx. 6000 K), tungsten (approx. 3200 K), fluorescent (approx. 4000 K) and flash (approx. 6000 K). In addition, it has an auto mode (AWB) and a custom mode. For a custom WB setting, first take a picture of a white subject serving as the white balance standard. Then, set the custom WB mode on the onscreen menu and specify that image.
In a substantial upgrade from the EOS Digital Rebel camera, the flash color data transmission function from the EOS 20D enables the built-in flash or an accessory Speedlite 580EX to provide flash color information which is used in exposure calculation when the white balance is set to 'AWB' or 'Flash'.
The EOS Digital Rebel XT camera shares its white balance correction and bracketing functions with the EOS-1D Mark II, EOS-1Ds Mark II and EOS 20D. Both the blue/amber and the magenta/green biases can be set up to +/- 9 levels. The user can correct or change the color temperature for the white balance mode currently set. One can therefore obtain the same effects usually provided by color temperature conversion filters or color correction filters. Blue/amber and magenta/green corrections can be set in combination.
In addition to the blue/amber bracketing offered in the EOS Digital Rebel camera, the EOS Digital Rebel XT camera also provides magenta/green bracketing. When the shutter is released, three images are created, each with a different bias setting in a range of up to +/- 3 levels in 1-level increments. White balance correction and auto exposure bracketing (AEB), can be set in combination with WB-BKT. When AEB and WB-BKT are combined, a total of 9 images will be saved to the CF card. WB-BKT does not work during RAW and RAW + JPEG shooting, since white balance settings can be adjusted during post-processing with the supplied software.
Processing Parameters
The Digital Rebel XT camera has the same range of image processing parameters as the EOS 20D: Parameter Set 1 (contrast, sharpness and color saturation set to +1) is optimized for vivid, sharp images upon which no retouching will be performed before direct printing. Parameter Set 2 (contrast, sharpness, color saturation and color tone set to 0, i.e., mid-scale), is optimized for images that will be retouched or adjusted. Parameter Sets 3, 4 and 5 can be customized by the user for contrast, sharpness, color saturation and color tone.
There is also a monochrome Parameter Set that makes black and white photography easy and great fun. This set incorporates five levels each of contrast and sharpness in addition to filter effects (none, yellow, orange, red and green) that are just like camera filter effects and toning effects (none, sepia, blue, purple, green) that use digital processing to produce prints that look like vintage photochemical artifacts In the Basic Zone modes, Parameter Set 1 is set automatically. In the Creative Zone modes, all six Parameter Sets are available.
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