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In a previous post, I noted that I was placing some large images in a Smugmug gallery for purposes of comparison. Those first images were taken at ISO 100, 400 and 800. Both the in-camera JPEG and a raw image file were posted. A subtle difference for those first six shots of the sky is that all were slightly underexposed. The last two shots (#7 and #8) were made “just right” by increasing the exposure by +2/3 stop as compared to the evaluative metering mode of the G9. Now to examine an ISO 800 “just right” image and compare the noise to the slightly underexposed variation.
In a previous post, I noted that I was placing some large images in a Smugmug gallery for purposes of comparison. Those first images were taken at ISO 100, 400 and 800. Both the in-camera JPEG and a raw image file were posted. A subtle difference for those first six shots of the sky is that all were slightly underexposed. The last two shots (#7 and #8) were made “just right” by increasing the exposure by +2/3 stop as compared to the evaluative metering mode of the G9. Now to examine an ISO 800 “just right” image and compare the noise to the slightly underexposed variation.
The image above is the ISO 800 in-camera JPEG that was underexposed by 1 stop in the bracketing process. This means it was actually underexposed by 1-2/3 stops in comparison to the "correct" exposure.
The images to be compared are the new Smugmug images #9, 10, 11, 12. These are the bracketed versions (+/- 1 stop) of images #5 and 6. Image #9 and 10 are the in-camera JPEGs and images #11 and 12 are the processed raw versions of #9 and 10 respectively. In particular, notice that image #12 has much less noise that image #11 and even less noise than image #6. The apparent reduction in noise is actually because much less noise is generated when the exposure is correct. In fact, this was the entire purpose of this little exercise: Minimize noise by avoiding underexposure.
The images to be compared are the new Smugmug images #9, 10, 11, 12. These are the bracketed versions (+/- 1 stop) of images #5 and 6. Image #9 and 10 are the in-camera JPEGs and images #11 and 12 are the processed raw versions of #9 and 10 respectively. In particular, notice that image #12 has much less noise that image #11 and even less noise than image #6. The apparent reduction in noise is actually because much less noise is generated when the exposure is correct. In fact, this was the entire purpose of this little exercise: Minimize noise by avoiding underexposure.
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