RAW with noise

[gualter_marques]

Sometime ago I shot my first RAWs and I've notice some noise in my pics. Some little brown details in all pics. At that time I was downloading pics to the PC using Camedia 4.2.

Last weekend I've shot some more RAWs and after downloading the pics surprise surprise... no more noise.

The difference is that I've installed Camedia again but didn't made the upgrade to 4.2 version, I was using version 4.1.

Anyone had the same problem ?

 

[edwinh]

Sometime ago I shot my first RAWs and I've notice some noise in my pics. Some little brown details in all pics. At that time I was downloading pics to the PC using Camedia 4.2.

Last weekend I've shot some more RAWs and after downloading the pics surprise surprise... no more noise.

The difference is that I've installed Camedia again but didn't made the upgrade to 4.2 version, I was using version 4.1.

Anyone had the same problem ?

What were your photo conditions - aperture, shutter, iso?
High ISO = more noise
Long shutter = more noise
Noise comes from the CCD/CMOS. RAW does not mean there is no noise. It stores whatever the sensor records with zero (or almost zero, depending on whether it is compressed) loss.

 

[ChrisA]

What were your photo conditions - aperture, shutter, iso?
High ISO = more noise
Long shutter = more noise
Noise comes from the CCD/CMOS. RAW does not mean there is no noise. It stores whatever the sensor records with zero (or almost zero, depending on whether it is compressed) loss.

You are right. There may have been a difference in the amount of light present which means the exposures were different. Basically more light means lower noise because you will use lower ISO and faster shutters. I'd suspect this effect but.....

One does not view RAW images. They are not formattd yet for display and must be converted to displayable format. The conversion process could be done "wrong" or "right" and there is some judgment involved as information must be tossed out in the conversion process. It is possable that the new conversion process in the new software is different

The only way to isolate the problem is to use the two versions of the software to convert the _same_ RAW files

 

[gualter_marques]

You are right. There may have been a difference in the amount of light present which means the exposures were different. Basically more light means lower noise because you will use lower ISO and faster shutters. I'd suspect this effect but.....

One does not view RAW images. They are not formattd yet for display and must be converted to displayable format. The conversion process could be done "wrong" or "right" and there is some judgment involved as information must be tossed out in the conversion process. It is possable that the new conversion process in the new software is different

The only way to isolate the problem is to use the two versions of the software to convert the _same_ RAW files

I will upgrade the software to see wath happens with version and I will post my observations then.
I still have the raws in the memory card so I will use the same RAWs for the test with version 4.2

The RAWs with noise were made in 10 to 25 meters visibility between the surface and 27 meters. Even photos that I made in land in full auto, had noise.
Now, the good RAWs were made in 2-3 meters visibility between the surface and 15 meters. Even 1 or 2 raws that I made in a cave has not that kind of noise.

I still think it's some kind of software problem in Camedia but I'll make the test with the to versions.