Canon's newer models with the high-performance DIGIC 4 processor use a more advanced form of in-camera High ISO Noise Reduction.
There are many different tricks and techniques to capture the beguiling colors, glitters, and twinkles of holiday lights.
Digital ISO is now a reliable answer to three persistent challenges inherent to outdoor and nature photography: capturing in low light, stopping action, and achieving greater depth of field.
John Paul Caponigro
It’s best to reduce noise at the point of capture. But, when an image contains noise, you can reduce it in your computer, sometimes dramatically.
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