wreath

[mikemeister_admin]

before watching video

[mikemeister_admin]

After watching video.I used black channel then Lab color boost to overwhelm shadow.

[mikemeister_admin]

Third pass back to wide gamut and a slight boost to the magenta,then a bit  of sharpening

[ggroess]

Greg,
Hard to tell from the images...how did the petal details hold up? 
The last image is a bit magenta overall...but the real lesson was about the K channel...

Greg

[mikemeister_admin]

Greg,on my monitor ,in PSE6,there was an improvement to the wreath.The bricks are a bit too red,but as you said the point is the black channel.Like Ganna this is the first time this example worked for me.I'll experiment somemore with it.

[ggroess]

mostly I was curious...I have accepted the slight casts as monitor differences and try not to assume...Glad it worked for you this time...CMYK can be a very powerful colorspace.  It makes more sense to people if they can think in negative colors...

C is Negative Red, M is Negative Green, and Y is Negative Blue...etc...K brings in the shadows and in press production it allows the printer to reduce the values of the other three colors.  Dan Margulis writes about it extensively...

Greg