Colour correction using channels - Adam Alex's CPR

[Caroline Ellison]

I am in ore of Adam Alex and his ability with PS!!  I went to his lighting superclass and was there on Monday when him and Nick Ghionis gave outstanding key notes.  Excellent. 

If you were there, please will someone fill in the gap for me.  Adam was discussing his colour correction technique using channels to adjust the colours.  I have made a lot of notes but how did he start this.  If I have an RGB images how do I get all the channels (red, yellow, green, cyan, blues, magenta) in the adjustment layer?  Do I first adjust in RGB, save as JPG then open again changing mode to CMYK with multiple channels.  I will be very grateful for enlightenment on this.

Thank you

[Jim Davies]

The colours are all there in the drop down box are they not.

Pick the Blue channel.  if you push the curves UP you add blue but if you pull the channel down you add the opposite colour (by subtracting blue) which is yellow.

With Red the opposite colour is cyan - Push the red channel up makes the image more red and down makes it more cyan.

Same with Green where the opposite colour is magenta.

Regards the curves you can increase small parts of the curvethat relate to specific parts of the tones in the image.

Curves are quite an advanced feature in Ps and tbh I don't really do much in there but I do add tones to an image in that way sometimes or if my skin tones are too red I'll select the red channel and drag it down a touch.

Did he change to CMYK? that's a whole differenty colour space from RGB.

Soon I'm sure they will be in Awe of your ability lol

[Caroline Ellison]

I only have the red, green, blue colours in the colour adjustment box.  I was asking about the CMYK as in that I can see the Cyan, magenta and yellow.  I was so busy taking notes when Adam demonstrated what he was doing I did not pay enough attention to see how he got all the colours in the drop box.  Was it one colour adjustment layer or two?  Once i have understood this I will be fine. 

[Steve Hargreaves]

Hi Caroline,

Image - Adjustments - Selective Colour, then choose each colour in the drop down box and reduce the opposite colours with the sliders.  He used this to remove any colour casts.

Steve

[Caroline Ellison]

Thank you Steve.

[Julie Fraser]

caroline i was like you too busy scribbling that I missed what he was showing on the screen so was it done on the same adjustment layer or were there 3 layers for each adjustment and was the layer left "normal" or did it change to another blending mode? 
 
I too am in awe.....if only i had a third of that knowledge I'd be a happy bunny!

[Jim Davies]

Hi Caroline,

Image - Adjustments - Selective Colour, then choose each colour in the drop down box and reduce the opposite colours with the sliders.  He used this to remove any colour casts.

Steve

Just had a look at that and like it   Quite powerful.

[Randell John]

Just had a play as well, I dropped the 'Black' slider down and it does a pretty good job of lifting shadows. I like, I like very much 

[Gary_Hill]

Curves and selective colour are some of the simplest, most powerful tools in PS, most of the so called vintage looks are easily achieved with curves, colour correction is easily done with curves and lots, lots more...