Since your B&W has the same numbers any color cast you are seeing is from your monitor/eyes/brain, I say this because it is pretty easy color wise to fool your eyes and brain. That is why I like color by the numbers.
Here is the short version, you may have to do some research in Photoshop to find the tools I am talking about. When I teach this class it is usually a six hour hands on class so it isn't really going to be possible to go fully into it here.
1) Open your image in Photoshop and make sure the Info and Layers palettes are open.
2) Select the Color Sampler tool, it is in with the Eye Dropper. Set the sample size to 5x5.
3) Select a highlight area with detail and click on it to place a sample point, repeat with a shadow area with detail and any other area that should be neutral so that you have three points. You can move these points later if you need to. Make sure that your highlight and shadow areas have detail and are not at 255/255/255 and 0/0/0.
4) Create a Curves Adjustment Layer in the Layers palette.
5) Go into the individual RGB curves and adjust each to get even RGB values for the points that you have selected in the image, you will be able to see the values in the Info palette as you adjust the curves.
That is it in a nutshell, I find that trying to set my highlights and shadows to the same vales each time give me consistency from one print to the next. The most critical part is selecting the points in the image to use so don't be afraid to move them if necessary, after you do this for awhile you will get a feel for where they need to go. You may not be able to always do three points depending on the image, in that case set what you can. You can also check skin tones by looking at the ratios on CMYK.
This should give you a start and something to try.
cort
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cort
www.cortanderson.comB&W Blogwhen the going gets weird the weird turn pro...Hunter Thompson