On the dynamic range of RAW...

Started Nov 30, 2004 | Discussions thread
ecm Senior Member • Posts: 1,661
Re: RAW and TIF, maybe some help.

Typeaux wrote:

A specific question for Guy:
I tried to use RAW on my C-5060 to do some portraits, and I had a
lot of trouble with graininess, ie. very high noise levels. It was
like I was shooting at ISO 400 (or worse), but I'd set the ISO at
80 manually. Is this normal for RAW?

Hi ecm,

I'm not Guy. I'm sure you guessed.

I'm also no expert at RAW, but it sounds like it might be your
RAW processing software. Have you tried looking at all of your
preferences? Does the graininess/noise persist if you convert to a
file format native to your software (i.e. .psd in Photoshop)? I've
had severe "noise" problems with some images that were corrected
simply by saving the image as something the software could handle
more effectively.

Thanks for the replies!

I have to use Cameida 4.1 to convert them to TIFF, then edit them(in GIMP for Windows). The only other program I've got that'll swallow Oly's ORF format is Irfanview, and it doesn't get the color balance at all right - everything is green after conversion. The files in Camedia were grainy even before conversion, the conversion process faithfully reproduced every pixel of noise. I did notice later that converting to JPEG reduced the noise levels a lot; that's why I wonder whether JPEG conversion also applies a good noise filter. The noise reduction I got converting to JPEG in Camedia was far superior to the results I got from Neat Image.

Unfortunately, I'm not able to fork out more than the cost of my camera for Photoshop CS at present..... Oh well, I'm going to try more lights next weekend. I'll try to post some examples when I get a chance.


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