Subject: Clamping

(This message is being sent to all CPSC 101 section 302 students)

(1)  The "monochrome" operation should have been included in the
     collection of operations in which "clamping" to the range [0,255] is
     NECESSARY.

(2)  When clamping is needed, it is TOO LATE to try to clamp the
     output pixel after it has been saved in the pixmap.  By definition
     an unsigned char IS ALREADY clamped to [0,255].

(3)  So, when clamping is necessary, as the r, g, b components of the
     output pixel are computed they should be stored in DOUBLE PRECISION
     values.

(4)  The doubles should then be clamped and AFTER clamping should be
     assigned to output pixel.