which isn't the same as "boosting the black channel"...
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C'mon now, Jonathan. It was obvious that the intended advice was to boost the blacks via the Selective Color command. That is a technique that will work, if used with care.
You never clarified that you understood the point about using Selective Color. The most charitable interpretation is that you were only quibbling over the reference to boosting the "black channel" as opposed to boosting the blacks in the photo via Selective Color.
You might want to consider that Selective Color uses CMYK colors to correct the image.
A couple of quotations from the Adobe Photoshop Help File might help inform this discussion:
"Even though Selective Color uses CMYK colors to correct an image, you can use it on RGB images."
"For example, you can use selective color correction to dramatically decrease the cyan in the green component of an image while leaving the cyan in the blue component unaltered."
IOW, discussion of the Black channel is not irrelevant with respect to discussion of Selective Color.
Back to your point . . .
which isn't the same as "boosting the black channel"...
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The recommendation was to boost the Black component for Blacks with Selective Color. That is pretty much the same as boosting the Black channel.
That misstatement was more helpful, in terms of giving the original poster a technique to use, than the quibble over boosting the Black channel v. boosting the blacks.
Cheers,
Mitch