High ISO Noise Reduction is a new feature that’s appeared on recent EOS Digital SLRs. As of early 2009, it’s a Custom Function choice in the EOS Rebel XS.
The new High ISO Noise Reduction feature gives a further option for users of recent EOS cameras to improve the quality of their images.
It has a noticeable impact on the level of visible noise in shots taken at higher ISO levels, and can even have a positive effect on an image at lower ISOs (if it’s subsequently lightened using image-editing software). Especially if you shoot JPEG images (MB: and video), we strongly recommend trying the different settings to see the effect it will have on your images. For RAW shooters, it can also make a noticeable difference in how Canon’s software processes your images — although with Digital Photo Professional software, you’re free to independently adjust chrominance and luminance noise reduction beyond the initial in-camera settings. More than ever, today’s digital SLRs are capable of excellent pictures at ISOs that were unthinkable just a few years ago.
With Canon’s most recent digital SLRs, the High ISO Noise Reduction technology is an important reason why.