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What Makes Shadows?

The Sun (or another light source) creates shadows
If there is sunshine/a light source, there will be shadows
Without the Sun/light source, we would not have shadows
A shadow happens when an object (or a person) gets between the
Sun/light source and the ground
If the Sun/light source is shining behind us, we see our shadows
cast in
front of us
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DROP SHADOW or CAST SHADOW

In graphic design, a drop shadow is an effect where an image is
repeated behind itself to create the illusion that the image is floating
over its background. A cast shadow is similar to a drop shadow but has
the added dimension of perspective. Cast shadows can be rotated, slid,
or stretched to create the illusion that the light source is coming from
different directions.


DROP SHADOW

www.phong.com/tutorials/dropshadow/
Drop Shadows in Photoshop
Dropshadows add contrast to objects, and add depth to an image. They
can increase visibility, and improve readablility. However, if used
inappropriately drop shadows will look cheesy.

www.jasc.com/tutorials/shadow.asp
Creating Drop Shadows
Step One: Create a selection area
The first step in creating a drop shadow using
Paint Shop Pro is to create
a selection area to apply the shadow to. It is also very important to note
that the drop shadow tool is an effect filter, and can only be applied to a
256 shaded greyscale image, or a 24-bit (16 million) color image, just
the same as the other effects filters.


CAST SHADOW

www.photoshopcafe.com/tutorials/cast%20shadow/cast%20shadow.htm
Cast Shadow  (Photoshop)
What do you do when a drop shadow isn't realistic enough? Create a
cast shadow.
When you see an object in a spotlight or a setting sun, you will notice
the long shadows that are created behind them, this technique will teach
you how to add realism to your images.

www.thinkdan.com/tutorials/photoshop/castedshadow/index.html
Casting Shadow  (Photoshop)
Welcome to the Casting Shadow tutorial. This tutorial was designed to
teach you how to create the illusion of depth and perspective by altering
the shape of your shadows

www2.evansville.edu/studiochalkboard/lp-shadow.html
Even shadows have vanishing points, but these do not correspond
directly to the vanishing points or horizon line. Shadows have their own
vanishing points which ....
This website offers the following hints:
Hint: Light radiates out in all directions. If you have a light source
directly above an object, then your object will cast shadows in all
directions.
Hint: Shadows can be cast on a number of surfaces. For instance, if you
have an object sitting on a table, then there will be a different shadow
vanishing point for the object (which will be on the tabletop) and for the
table (which is on the floor).
Hint: When the light source is the SUN or MOON, the shadow vanishing
point is on the horizon directly below the light source.
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WHAT COLOR IS YOUR SHADOW?
On a clear and sunny day you are on snow and look at your shadow. You
see that it is tinted
a) red       b) yellow       c) green       d) blue       e) not at all
Click
here for the answer  
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See a shadow used in a logo - click
here
see 'logo.jpg'
Shadows show us where something
is - in this case, whether the plane
is on the ground or up in the air
Does the shadow under the
yacht in this photo indicate
that the yacht is above the
surface of the water?