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i was playing with the light in this case sunlight streaming through a window next to me , but to me the shot seems noisy in fact way to noisy !!! .....is it my post production or is the sunlight blowing it out !! ....or am i totally wrong on each count !!...any comments welcome ty
| Brand: | Pentax |
| Camera: | Pentax K-r |
| Lens: | smc PENTAX-DA L 18-55mm F3.5-5.6 AL |
| Recording media: | RAW (digital) |
| Date Taken: | 17 Oct 2012 - 10:49 AM |
| Focal Length: | 26.2mm |
| Aperture: | f/14.0 |
| Shutter Speed: | 1/250sec |
| Exposure Comp: | 0.0 |
| ISO: | 12800 |
| Exposure Mode: | Landscape |
| Metering Mode: | Multi-segment |
| Flash: | Off, Did not fire |
| White Balance: | Custom |
| Title: | Twang |
| Username: | 
Bloggs |
| Uploaded: | 17 Oct 2012 - 8:50 PM |
| Tags: | General |
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Comments
Quote: The ISO of 12,800 might have something to do with it.....
That's the first thing that springs to mind.
I see also that you used 'landscape' as the exposure mode. I don't know a great deal about pre-set modes as I just about never use them but I'm guessing that that might also have some bearing upon it.
I was being ironic.
The ISO of 12,800 is everything to do with it. The higher your ISO, the more noise you start to get. In modern cameras, it starts to become an issue over about 800 - 1600, but at 12,800 you are amplifying the signal from the sensor so much, you amplify any noise. In the same way if you amplify an audio system you also amplify background hiss, the coloured pixels are the visual equivalent.
To avoid it, use as low an ISO as you can get away with, preferably somewhere in the region of 100 - 1000 ISO. It is possible to improve it in software, but those high ISOs are really for when you absolutely need to get the shot in near darkness.
Nick
ironically the highlights are not blown, getting detail there and on the face was a near miracle. the high iso and the crop are almost certainly responsible for the grain and you could have helped a little by using a reflector to bounce some light back up the the face and reduce the contrast a little. the grain shows most in the dark areas where there is little detail. about 80 % of the information on a digital file is at the bright end of the scale and vertually non at the black end.
image wise i like the idea, just would have loved to see the guitar neck included and some light bounced back into the face / front.
Phil
Thanks for this guys ....i did have the camera on some auto settings plus i also used some manual settings for the photos so you are right that 12800 is way out of order but as a learner i will no doubt make lots more mistakes and i will also be back to ask your advice .....cheers again Sam 
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