The left side of a human face is close to being the mirror image of the
right side - but not exactly. The first photo (in each section below) is the
original photograph of the individual. The second and third
photographs are composite pictures made by merging each side of the first
picture with its corresponding reflection.
If the vertical line (line of symmetry) is drawn through the center of
each of the composite pictures, each point of the picture on one side of the
line has an image point in the other side. The composite pictures are
symmetric with respect to this vertical line.
Using a digital camera, take photographs of
the students in your class. Try to get the
students to look directly at the camera and to avoid tilting their heads.
This is not always easy to do. Smiles!
Using a drawing program, such as Paint
Shop Pro or Adobe Photoshop, create composite drawings such as those shown above.
See directions listed below.
Print the three photos to be
given to the students.
This activity will take some time
to prepare. Your efforts, however, will be very well received by the
students (and their parents).
My students were amazed at their
new images and giggled and laughed appropriately. Teachers from other
subject areas approached me the day of this activity to explain that the
students were showing the photos to their other teachers. When I asked if
the students could explain what had gone on in the photos, I heard responses
such as " yes, I heard the whole story about line symmetry."
Bingo! Mission accomplished.
Paint Shop Pro:
|(1) Open your photo
and save it under a new name so as not to damage your original
(2) Use your selection tool
to outline one side (half) of the photo.
(3) Under IMAGE, choose MIRROR.
the new image so it will create a new face.
(5) CROP your new image, and
SAVE the photo.
(7) Repeat the process for the other side of the face.
|(1) Open your photo and save it under a new
name so as not to damage your original photo.
(2) Use the RECTANGULAR MARQUEE TOOL to select one side (half) of
(3) Select EDIT / COPY.
(4) Select EDIT / PASTE.
(5) Use the MOVE TOOL to position the half of the photo
over the right half.
(6) Select IMAGE / ROTATE / FLIP LAYER HORIZONTAL to flip
the other half.
(7) Use the BLUR TOOL to soften the vertical line in the middle.
(8) SAVE the photo.
(9) Repeat the process for the other side of the face.