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This is a test of the camera's noise levels. The higher the signal to noise ratio, the greater the difference in strength between the real image data and random background noise, so the 'cleaner' the image will look. The higher the signal to noise ratio, the better.
Panasonic G7 signal to noise ratio charts
JPEG signal to noise ratio analysis: The G7 competes well with the other cameras, indicating that noise is controlled well in JPEG images.
Raw (converted to TIFF) signal to noise ratio analysis: The G7 puts in a very impressive performance at lower sensitivity settings, indicating that noise is controlled very well and images are clean.
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