Smart Photography 201707

5. Lab Colour
   Go to Image > Mode > Lab
   Colour. Go to Windows >
   Channels. Click on the ‘b’
   channel and drag it to the
   trash bin at the boottom of
   the Channels panel. Two new
   channels (Alpha 1 and Alpha

2. will form. Select Alpha 2
   and delete it. Go to Image >
   Mode > Grayscale. You will
   notice that this method gives
   you better conversions than
   the first three mentioned above
   but surprisingly, it does not
   work equally well for some
   conversions.

6. Channel Mixer
   This method provides a good
   conversion but is rather
   complicated. Create an
   adjustment layer for Channel
   Mixer (Click on the half-
   black half white circle at the
   bottom of the Layers panel and
   select Channel Mixer). In the
   Properties box that opens, click
   in the Monochrome check box.
   The image will turn to B&W.

You will notice that there are 3

sliders named Red, Green and

Blue, which correspond to the three

primary colours in the image. The range

per colour is minus 200 to plus 200%.

© Akshay Rao D

Move these sliders (some trial and

error is required) till you are satisfied

with the result. Note that if you total

the percentage of the three sliders, it

should be as close to 100% as possible

to achieve the best B&W effect.

Lab Colour

Printscreen showing

percentage for Channel Mixer

Channel Mixer

LEARNING

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Smart PhotographyJuly 2017