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+.help blkrep Sep86 images.imgeom
+.ih
+NAME
+blkrep -- block replicate n-dimensional images
+.ih
+USAGE	
+.nf
+blkrep input output b1 [b2 b3 b4 b5 b6 b7]
+.fi
+.ih
+PARAMETERS
+.ls input
+List of images to be block replicated.  Image sections are allowed.
+.le
+.ls output
+List of output image names.  If the output image name is the same as the input
+image name then the block replicated image replaces the input image.
+.le
+.ls b1, b2, b3, b4, b5, b6, b7
+Block replication factor for dimensions 1 - 7.  Only the block factors for
+the dimensions of the input image are required.  Dimension 1 is the column
+or x axis, dimension 2 is the line or y axis.
+.le
+.ih
+DESCRIPTION
+The list of input images are block replicated by the specified factors
+to form the output images.  The output image names are specified by the
+output list.  The number of output image names must be the same as the
+number of input images.  An output image name may be the same as the
+corresponding input image in which case the block averaged image
+replaces the input image.  Only the block factors for the dimensions
+of the input images are used.
+
+This task is a complement to \fBblkavg\fR which block averages or sums
+images.  Another related task is \fBmagnify\fR which interpolates
+images to arbitrary sizes.  This task, however, is only applicable to
+two dimensional images with at least two pixels in each dimension.
+Finally, in conjunction with \fBimstack\fR a lower dimensional image
+can be replicated to higher dimensions.
+.ih
+TIMINGS
+VAX 11/750 with FPA running UNIX 4.3BSD and IRAF V2.4:
+
+.nf
+       SIZE DATATYPE REPLICATION     CPU  CLOCK
+        100    short           5    0.5s     1s
+        100     real           5    0.5s     1s
+    100x100    short         5x5    1.7s     5s
+    100x100     real         5x5    2.1s     6s
+  100x100x1     real       5x5x5    9.7s    33s
+.fi
+.ih
+EXAMPLES
+.ls 4 1.
+To block replicate a 1D image in blocks of 3:
+
+cl> blkrep imagein imageout 3
+.le
+.ls 4 2.
+To block replicate a 2D image in blocks of 2 by 3:
+
+cl> blkrep imagein imageout 2 3
+.le
+.ls 4 3.
+To block replicate two 2D images in blocks of 5 by 5:
+
+cl> blkrep image1,image2 out1,out2 5 5
+.le
+.ls 4 4.
+To block replicate a 3D image in place by factors of 2:
+
+cl> blkrep image1 image1 2 2 2
+.le
+.ls 4 5.
+To smooth an image by block averaging and expanding by a factor of 2:
+
+.nf
+cl> blkavg imagein imageout 2 2
+cl> blkrep imageout imageout 2 2
+.fi
+.le
+.ls 4 6.
+To take a 1D image and create a 2D image in which each line is the same:
+
+.nf
+cl> imstack image1d image2d
+cl> blkrep image2d image2d 1 100
+.fi
+.le
+.ls 4 7.
+To take a 1D image and create a 2D image in which each column is the same:
+
+.nf
+cl> imstack image1d image2d
+cl> imtranspose image2d image2d
+cl> blkrep image2d image2d 100 1
+.fi
+.le
+
+.ih
+SEE ALSO
+blkavg, imstack, magnify
+.endhelp