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A100 iso1600; help needed
Topic Started: Apr 17 2008, 07:41 PM (1,236 Views)
weishengg
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Hi all, I need some help over here.

I realize that for the A100, an iso1600 shot looks a lot "duller" (colour wise) than an <=iso800 shot.

Any recommendations on how to make the pictures vibrant again?
i tried using the "Saturation-slider" in Picasa but it makes a lot of blue specks appear in the picture.

I also tried shooting in Vibrant setting with Saturation +2, but that didnt seem to help much.

Any comments?
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weisheng
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DewaKarma
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Buy A700 :P
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Ming
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For me i never ever tried shooting A100 with ISO higher than 400 after knowing 'what' it will produced ... :sweat:

You want vibrant results ? Shoot with ISO100 or maximum ISO400 then go do in Photoshop ba . :lol:
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Shadow
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Maybe you may like to post the 2 shots of ISO800 and ISO1600 for us to see and advise.
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Trigger Happy
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DewaKarma
Apr 17 2008, 08:11 PM
Buy A700 :P

aiyoh... poison!!! :knock:


weishengg, this is normal, higher iso will introduce more noise into your picture as the film (in today's context, the sensor) is more sensitive to light. i'd avoid 1600 if possible. 800 is as far as i'd go, even with the a700 unless there's sufficient light like flash use.

two ways to "rescue" the picture:

1. use noise reducing s/w - like NeatImage (free) although this would likely dull your pic further as some detail is lost when noise is removed.

2. turn the picture to b&w - simple desaturate or other more complicated techniques


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weishengg
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Trigger Happy
Apr 18 2008, 01:08 AM
aiyoh... poison!!!  :knock:


weishengg, this is normal, higher iso will introduce more noise into your picture as the film (in today's context, the sensor) is more sensitive to light. i'd avoid 1600 if possible. 800 is as far as i'd go, even with the a700 unless there's sufficient light like flash use.

two ways to "rescue" the picture:

1. use noise reducing s/w - like NeatImage (free) although this would likely dull your pic further as some detail is lost when noise is removed.

2. turn the picture to b&w - simple desaturate or other more complicated techniques

oh no!
think i got misunderstood :P

I am aware that at iso800-1600 i will be getting lotsa noise on this camera (chroma noise especially :wacko: )

but i'm just curious why the iso1600 pictures appear a bit desaturated as compared to one at iso800, and what would be a good way to salvage the loss in vibrancy of colours.

will post up some pictures soon to elaborate my point :P
sorry for the confusion!

oh and of course, the a700... the best way out... :thumbsup1:
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zcf
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As we notice, A100 at ISO1600 only have a dynamic range of 6.2 EV, ISO 800 have 7.0 EV, while normally it's 8.1 EV. So it lose out dynamic range in high ISO mode like ISO1600.
http://www.dpreview.com/reviews/SonyDSLRA100/page21.asp

At ISO it has a duller colour mainly due to noise suppression. Adjust higher contrast will bring out the boise or blue dots as you notice. But If you resize the image into a much smaller size, it may help to reduce the noticeable noise.
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RiRi
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Yea , generally for a100.
I try not to shoot past iso 400, the quality of the pics drop dramatically.

But i have not seen what happens if you shoot wif A700 ISO1600.
Is it as grainy?
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Trigger Happy
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RiRi
Apr 18 2008, 02:35 PM
Yea , generally for a100.
I try not to shoot past iso 400, the quality of the pics drop dramatically.

But i have not seen what happens if you shoot wif A700 ISO1600.
Is it as grainy?

nope. its quite good. but to me, its still obvious.
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ChaoxAngel
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After eliminating the chroma noise, it should look like film grain. :wub:
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