Visual Evaluation
We are now entering the exciting world of greyscale tonal evaluation, deep
inside the channels of our RGB image — the bare bones of bitmap imaging.
We are going to go through each channel of the image and simply try to
match the greyscale luminance levels to the target layer:
- In the Channels palette, solo the red channel by either clicking the
channel or using the keyboard shortcut Cmd/Ctrl + 3. You should see
the entire image in greyscale, representing the luminance values of red. - Select the layer for figure 2 and add a Curves adjustment layer just above
it. Make this adjustment layer a clipping mask by Alt/Opt clicking
between the two layers in the layer palette. You could also select the
adjustment layer and use the keyboard shortcut Cmd/Ctrl + Alt/Opt +
G. Now select the red channel inside Curves.