While comparing the features of Canon 400D and 1000D, I've noticed that Canon 1000D has an improved DIGIC III processor, over the DIGIC II for Canon 400D.
From Wikipedia:
The DIGIC III Image Processor was advertised to deliver superior image quality, faster operation and extended battery life compared to its predecessor.
Will a newer version of the DIGIC processor provide visible improvements of image quality? What about when shooting in RAW?
I understand that newer versions may perform faster (when focusing, or a higher frame rate) and have features such as face detection and live view, but that is of no importance to me.
Answer
The answer is Yes and No. It will indeed provide improvements in image quality when shooting jpeg, but the raw image is unaffected by DIGIC processing, it being the raw unprocessed data. Here is an article produced by Canon about Digic processing A/D conversion and RAW files:
http://www.usa.canon.com/dlc/controller?act=GetArticleAct&articleID=2748
Most importantly, the increase in Bit Depth of the DIGIC IV processor:
Equally important are the image quality benefits provided by the DIGIC 4’s integrated 14-bit Analog-to-Digital (A/D) converter...
Unfortunately for your specific DIGIC III question its mostly about the advantages of DIGIC IV :p
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