Canon PowerShot A300 Service Manual page 13

-High speed AF and high definition AE/AWB
based on iSAPS technology
Using "Photographic Space" information, the
PowerShot A300 estimates the distance between the
camera and the subject from the focal length (zoom
position)* of the lens and the peripheral brightness
when taking a photo. Furthermore, by adding the
photo paramenters obtained with the previous
photo, the scene the user is about to shoot is pre-
analyzed and pre-calculated. This method achieves
faster AF and more precise, AE and AWB than
ever before.
* The PowerShot A300 has no optical zoom
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Figure 2- Distribution of object position at specific
focal length
>iSAPS High-speed AF
Using iSAPS technology, the cameras achieve fasror focusing speeds by optimizing the control of the
AF scan range through a pre-analysis process to match the scene the user is about to shoot.
>iSAPS Intelligent AE/AWB
Using iSAPS technology, the cameras achieve precise exposure and white balance through an algo-
rithm optimized for the scene the user is about to shoot by analyzing the scene beforehand.
-High-precision white balance (Auto + Five preset positions + Custom)
The PowerShot A300 adds custom white balance to the white balance functions (auto and five-position preset) .
The custom white balance allows the user to record a desired white reference (usually a white piece of
paper) beforehand under the shooting conditions (light sources) employing a camcorder or other
device. This white reference data is stored in the camera and used.
This function is useful when users cannot get the white balance they want in the auto mode or from
one of the five presets when shooting under special light sources or when mixing two or more light
sources.
The custom white balance data is maintained even when the power is turned off and can be updated
anytime by performing the sampling operation again.
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