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-@node Pictures,  , Starbase Graphics, Graphics
-@section Pictures (MIT 6.001 implementation only)
-
-@cindex pictures
-A @dfn{picture} data object is a two-dimensional array of real numbers
-that represents a grey-scale image on the screen.  The grey level that
-the value of each element represents is determined relative to the range
-of values of the array.
-
-The width of a picture is the number of elements in each row and the
-height is the number of elements in each column.  The elements are
-referenced by giving the horizontal component first and the vertical one
-second, with the origin at the bottom left corner of the displayed
-picture.
-
-Coordinates (@var{i}, @var{j}) are @dfn{valid coordinates} of picture
-@var{p} if and only if:
-
-@example
-@group
-(and (exact-nonnegative-integer? @var{i})
-     (exact-nonnegative-integer? @var{j})
-     (< @var{i} (picture-width @var{p}))
-     (< @var{j} (picture-height @var{p})))
-@end group
-@end example
-
-@menu
-* Construction of Pictures::    
-* Manipulating Pictures::       
-* Displaying Pictures::         
-* Saving and Restoring Pictures::  
-@end menu
-
-@node Construction of Pictures, Manipulating Pictures,  , Pictures
-@subsection Construction of Pictures
-
-@code{make-picture} and @code{procedure->picture} are simple ways to
-make pictures.  @code{picture-map} is a way to create a new picture by
-applying a procedure to one or more pictures.  Pictures can also be made
-by reading files: see @code{pgm-file->picture}.
-
-@deffn {procedure+} make-picture x y [k]
-@var{X} and @var{y} must be exact positive integers and @var{k}, if
-specified, must be a real number.  Returns a picture of width @var{x}
-and height @var{y}.  If @var{k} is specified then each picture element
-is initialized to @var{k}, otherwise the elements are unspecified.
-@end deffn
-
-@deffn {procedure+} procedure->picture x y f
-@var{X} and @var{y} must be exact positive integers, and @var{f} must be
-a real-valued procedure of two variables.  Returns a picture of width
-@var{x} and height @var{y}, where the value of each element is the
-result of applying @var{f} to the element's coordinates.
-@end deffn
-
-@deffn {procedure+} picture-map f picture @dots{}
-@var{F} must be a procedure, and all of the @var{picture} arguments must
-have the same dimensions.  Returns a newly allocated picture, each
-element of which is obtained by calling @var{f}, passing it as arguments
-the corresponding element of each @var{picture} argument.  (Thus @var{f}
-must accept the same number of arguments as there are @var{picture}
-arguments to @code{picture-map}.)
-
-In other words, each element could have been initialized as follows:
-
-@example
-@group
-(picture-set! @var{result} @var{i} @var{j}
-              (@var{f} (picture-ref @var{picture} @var{i} @var{j}) @dots{}))
-@end group
-@end example
-@end deffn
-
-@node Manipulating Pictures, Displaying Pictures, Construction of Pictures, Pictures
-@subsection Manipulating Pictures
-
-@deffn {procedure+} picture? object
-Returns @code{#t} if @var{object} is a picture, otherwise returns
-@code{#f}.
-@end deffn
-
-@deffn {procedure+} picture-width picture
-@deffnx {procedure+} picture-height picture
-These procedures return the width and height, respectively, of
-@var{picture}.
-@end deffn
-
-@deffn {procedure+} picture-min picture
-@deffnx {procedure+} picture-max picture
-These procedures return, respectively, the least and the greatest values
-stored in @var{picture}.
-@end deffn
-
-@deffn {procedure+} picture-ref picture i j
-Returns the value of element (@var{i},@var{j}) of @var{picture} (always
-a real number).  @var{I} and @var{j} must be valid coordinates for
-@var{picture}.
-@end deffn
-
-@deffn {procedure+} picture-set! picture i j k
-Stores @var{k} at element (@var{i},@var{j}) in @var{picture} and returns
-an unspecified value.  @var{K} must be a real number and @var{I} and
-@var{j} must be valid coordinates for @var{picture}.
-@end deffn
-
-@node Displaying Pictures, Saving and Restoring Pictures, Manipulating Pictures, Pictures
-@subsection Displaying Pictures
-
-To display pictures, an X graphics window must first be created.
-Although any window may be used, the colormap will not be guaranteed to
-be correct for grey-scale pictures, therefore the recommended way of
-creating windows for displaying pictures is to use the
-@code{make-window} procedure.
-
-@deffn {procedure+} picture-display w picture [min [max]]
-Displays, in the graphics device @var{w}, the largest integer scaling of
-@var{picture} that can be contained in @var{w}.  If @var{min} and
-@var{max} are specified then the grey levels will be computed using
-these values as @var{picture}'s minimum and maximum values, otherwise
-the actual least and greatest values of @var{picture} will be used.  The
-value returned by this procedure is unspecified.
-@end deffn
-
-@deffn {procedure+} make-window w h x y
-Returns a graphics device of width @var{w}, height @var{h} and screen
-position @var{x},@var{y} (as would be given in an X geometry string)
-with a grey-scale colormap attached.
-@end deffn
-
-@node Saving and Restoring Pictures,  , Displaying Pictures, Pictures
-@subsection Saving and Restoring Pictures
-
-Pictures can be read from or written to files in @sc{pgm} format using
-the following procedures.
-
-@deffn {procedure+} pgm-file->picture pathname
-Reads a grey-scale image stored in @sc{pgm} format from the file
-@var{pathname}, returning a picture whose graphical representation will
-closely resemble that of the saved image.
-@end deffn
-
-@deffn {procedure+} picture->pgm-file picture pathname
-Saves @var{picture} in @sc{pgm} format in the file @var{pathname}.
-Overwrites any previously existing file of that name.
-@end deffn