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The first thing to do is "lift" the blue car in the foreground
and place it on its own layer. There are a number of ways to
achieve this - I opted for a combination of the Pen Tool and
Quick Mask. Use your own favoured method and place a selection
around the car and its driver.
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Once you have your selection - "the marching ants" - around
the car, press keys CTRL+J to copy it to its own individual
layer.
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For now, click the eye icon next to the car so it doesn't get
in our way.
Click on the BACKGROUND layer in the LAYERS PALETTE to activate
it. From the IMAGE menu, select ADJUST and then DESATURATE.
This will turn the background layer to greyscale.
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Now from the FILTER menu, choose the FIND EDGES
command from the STYLIZE menu. Because we drained the colour
from the layer, we will get a combination of dark and light
lines ranging from black to various shades of grey... just like
a sketched look.
Press CTRL+L to bring up the LEVELS dialogue box and move the
middle triangle slightly to the left. This will lighten the
lines.
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What we want to do now is add a sense of motion to the background
area. This is achieved by using the MOTION BLUR option from
the FILTER menu. Before we apply this filter, though, press
Q to enter QUICK MASK mode. Next press the G key to activate
the GRADIENT tool. Make sure that the FOREGROUND to BACKGROUND
option is selected from the OPTIONS palette.
Click and hold down your mouse button on the middle right edge.
Hold the SHIFT key and drag the cursor over to the left hand
side of the picture. Release the mouse button and press Q to
return to NORMAL EDITING mode. From the SELECT menu, choose
the INVERSE command to swap the selection around.
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From the FILTER menu choose BLUR and then MOTION BLUR. Opposite
are the settings I used, but you can choose a different figure
for the Distance settings if you want.
Because we applied the GRADIENT tool in the QUICK MASK mode,
we now get a steady transition of the MOTION BLUR tool. You
will notice how it is more dominant to the right than it is
to the left.
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Remove the SELECTION by pressing CTRL+D. Click on the car layer
to activate it. You should now have your car in its original
colour and form, with the background looking like it has been
sketched and smudged from the right. To make it look a little
more realistic apply the RADIAL BLUR filter to the wheels of
the car.
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Ok, we're nearly done. Click on the background layer to activate
it. Select the PAINTBRUSH from the TOOL BOX and then press the
ENTER key to activate its options. Click on the WET EDGES option
(you should get a tick next to it) and lower the opacity to
about 50-55%.
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Now for the painting effect. Choose a color for the car on
the left and gingerly paint over it. Try and keep it tidy, but
don't be too accurate. Repeat the process for other objects
that are on the background.
It's up to you how much you color you add - don't go too far
or you'll lose the effect. Because we are using the WET EDGES
option, every time you repaint over an area you have already
painted, the colour darkens - similar to watercolor painting.