Creative Image Editing in Photoshop - Black and White in Photoshop CS4 and Photoshop Lightroom - page 243

Split toning is a traditional process that originated in the wet darkroom where
the toners applied to an image would adhere to only certain areas of the print,
like to the shadow values alone, for example, while leaving the remaining
portions unchanged. One common technique with this method was to
warm the highlights and cool the shadows. This technique would add more
apparent depth to an image, as well as a greater amount of visual complexity.

Note:
Color Range dialog now
includes:
• a new more accurate
algorithm.
• the ability to select
from multiple colors
• the ability to directly
load as masks (from
the New Mask panel.)
• the ability to adjust
density and feathering
of masks.

Step 1: Apply your grayscale conversion of choice.

Step 2: Isolate the area you wish to tone. For this image I chose to select the
highlights. Go to the Select Menu Color Range Highlights.

Step 3: Feather the selection to soften the transition edges. Go to Select
Menu Rei ne Edge, or Select Menu Modify Feather. Choose
a value that works for the area selected relative to the image size
dimensions. For this image I chose a value of 15 and a smooth value of 4.

Step 4: Create a new Hue/Saturation adjustment layer. Go to the
Adjustment Panel Hue Saturation, or choose Hue/Saturation from
the adjustment panel or adjustment layer icon at the bottom of the
Layers palette.

Step 5: Click “Colorize” at the bottom of the dialog box and choose a
hue that has a nice sepia feel. I chose a hue of 45 for this image and
an opacity of 10. You should choose the hue and reduce the opacity,
however, to your liking.