Concept
By using channels and curves we have another method
to get grayscale output.
1. Open an image to use Channels for grayscale output.

2. Windows > Channels
3. Or Switch to Channels Palette.
4. We will again select Red Channel
.
5. With Red, its too light.

6. Image > Adjustments
> Curves
7. Adjust the Curve as shown in the following image.

8. Create New Grayscale document and drag Red Channel
on it.
9. Delete Gray channel from the channel palette of
the new file.
10. Image > Mode
Switch to Grayscale from Multichannel
11. You can trim the file if the original file is
bigger than the dragged image.

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