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I wonder if this is because having more pixels enables the signal processing algorithms to have more 'points' to access in 'cleanup'But despite that, the G3 still has a significant advantage when it comes to noise, at equalized ISO rates. I think about 1/2 stop ISO to ISO.
I think you have a pretty good point. But there is more.I wonder if this is because having more pixels enables the signal processing algorithms to have more 'points' to access in 'cleanup'
yes, now that you mention it, but I wonder how much this can be done in analog side with specialised signalprocessing stuff ... rather than the brute force done on digital side with binary maths?The combination of more pixels and more complex processing must really demand a lot of calculations. You could not do this with an older, slower camera computer. The G3 inherits the faster GH2 processor.
What I know comes from having gone through code for DCRAW, which is an open source program that implements processing to convert raw sensor data to a finished image. DCRAW gives you get a good sense of what happens in any image conversion. Here is what I learned. It applies to a Nikon raw file, but I suspect the same steps are present in Panasonic RW2 files.Hi
yes, now that you mention it, but I wonder how much this can be done in analog side with specialised signalprocessing stuff ... rather than the brute force done on digital side with binary maths?
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and yes, I do think that RAW is processed to some extent before its written to the RW2 file (after all, it was analog somewhere right?)
yep, nice program, use it myself for making comparisons at a 'level playing field'What I know comes from having gone through code for DCRAW,
this part we are uncertain about. For a start the sensor data must undergo Analog to Digital conversion, and there is no reason why there could not be other signal processing at this point.When you shoot raw, sensor data is just copied into the raw file and data on
yep, that's for surecamera settings, white balance, etc is added to the front. But the raw file also gets a jpg version tucked in, which allows the camera to display the image and which becomes the thumbnail picture when you import the raw file into a computer. So the camera computer does have to run through very dense code to create the jpg thumbnail in a raw file. Add more pixels to an image and the camera computer gets very busy.
I don't enable raw file conversion, but yes that would add to camera image processing. But there is a compression that happens after A/D conversion. Again, this is from reading DCRAW code and not knowing exactly what the camera does....this part we are uncertain about. For a start the sensor data must undergo Analog to Digital conversion, and there is no reason why there could not be other signal processing at this point.
I guess you're aware of the compression applied to NEF files?