wonder why the noise floor here is so high?

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wonder why the noise floor here is so high?

titlewonder why the noise floor here is so high?
capture deviceCanon PowerShot G2
aperture4
date captured2002:02:11 20:26:27
exposure bias0
exposure index50
flash firedoff
fnum4
subject distance45.297 m
focal length_mm10.6875 mm
height1704
max aperture2
meteringmulti-segment evaluative
exposure1/60 sec
shutter speed1/60 sec
width2272
image qualitySuper fine
macro modenormal
shooting modeSingle frame shooting
autofocus modesingle
contrastNormal
saturationNormal
sharpnessNormal
exposure modeAv
white balanceAuto
af points_used3 - centre
flash ec0
firmware versionFirmware Version 1.01
capture device_ownerPeter Jensen www.diff.net
filenameimg_2994.jpg