1st November 2003, 01:04 AM
1st November 2003, 01:46 AM
Sounds like you set your ISO too high.
High ISO = noise, noise, noise !!
1st November 2003, 01:49 AM
I think he's using ISO 50, as in his previous thread...
OK. some suggestion...
Take a picture of the afternoon sky, or anything U thing the noise not acceptable.
Post a 100% size crop of the noise here...
Then we can comment whether it's ok or not...
1st November 2003, 02:17 AM
no,this time using iso 100..
i cannot post pic here leh...
3rd November 2003, 11:03 AM
the "noise" you are seeing may not be due to the usual high iso or low light reasons...
check what are your jpeg compression settings on your camera...
the higher the compression, meaning the lower the quality, results in a more computationally simple rendering of the colors of each individual pixel...
you will see this as inaccurate noisy images...especially if you looking at a single tone like your blue sky.
try setting you camera at the highest qualilty (not necessarly higest resolution) and perform the shoot again...
i reckon you might have solved the problem...
there is no reason why iso noise or low light noise should occur at the shooting conditions mentioned...
3rd November 2003, 10:25 PM
What is your camera? Some cameras exhibit noise and/or sharpening artifacts even when viewed 100% at lowest ISO settings. But when downsampled or printed out they should look ok.
6th November 2003, 11:28 AM
My camera is Nikon Coolpix 5400.I have already set the resolution and stuff to the max I can.
Zerstorer,wat do u mean by downsampled?
6th November 2003, 11:32 AM
edwinywh : the best is show us a 100% of a pix la...
else it's very difficult to get any good suggestions...
7th November 2003, 11:19 AM
Sigh.... I can't post attachment here.Or else I would already have shown u guys the pics.
7th November 2003, 11:55 AM
Edwin, I will try to understand your problem. You use your digicam, set to A mode, then point it to the sky on a bright day, right?
If the above is correct, then I think you use a very small aperture, (ie a large f-number I think f16 or f22?) on your cam. Since you point it to the sky, the A mode will try to guess the correct shutter to use. Because the sky is bright, so the cam will choose a fast shutter (I think 1/250 or 1/500?) The cam will then underexpose (the cam is not as clever as you and me, it thinks the sky is bright so choose a fast shutter)
If the above is correct, then you have a under-expose photo, probably about 2 stops under. Then when you want to see this photo on your computer monitor, you see it is very dark.
For under-expose photo, it is common to see noise.
How to prove this is right or wrong? You can use M mode, then keep the shutter constant, point to the same sky, then test-shoot at every aperture, probably from f2 to f22. Compare the results and tell us later.
7th November 2003, 12:51 PM
Astin, It makes sense to me.
Edwin, I dont understand why you cannont give us any link to your pic. Why not register to PBASE and upload you pic?
7th November 2003, 02:07 PM
7th November 2003, 04:07 PM