Curvemeister Forum

Hi
I hope someone can explain something for me
The first step I take in colour correction is to go into the different channels and adjust in curvemeister for luminosity
I have begun to notice how noisy the sky is in many images in the red channel, but not the green or blue
if I end up replacing the blue channel with the red one the noise is really noticeable
Especially when sharpening at the end

I guess I want to know if this is a problem I am creating inadvertently, or if its just the nature of the red channel
Also if anyone has any solutions I would love to hear them

At the moment I am copying the sky into another layer and adjusting for noise - it works, but I wonder why it happens in the first place

Julie

Julie,
Can you post an example and a sample curve so i can see if you are creating it inadvertently. 

I think that would be the most help.  Also what ISO are you setting on the camera?  Higher ISO settings are noisy in every channel.

Greg

Hi
sorry for the delay in posting again
the images attached show the original and all the channels
the original does not have much noise but if I need to replace the blue channel with red or both green and blue with red to increase the luminosity I end up with a very noisy sky
then when I sharpen its worse

This is a harsh adjustment for this image and but I just used it to show what is happening

I can fix it but I just want to make sure its not something I am causing either in my camera or post processing

I am happy to be told I am overreacting and being too fussy

thanks for your time
Julie

any more word on an advanced curvemeister class? No pressure just imterested

 

Julie, I think using a mask and work selectively may be a solution. I often do selective sharpening through a mask

thanks ganna

that's what I have been doing and it works well
Are you able to use a curvemeister mask or do you use the mask in photoshop
sometimes I just copy the sky and paste into another layer

Julie

Yes, I do the same :)

Try switching the image to LAB mode in PS and Gaussian blurring the B channel a bit more than the A channel and see if you get a better result? 

If it is color noise that can be an effective way to handle it sometimes...
Greg