Plan 9 - man page for transpose (plan9 section 9)
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rotate, transpose - re-orient an image
fb/rotate angle [ input ]
fb/transpose [ -vhadrlui ] [ -ox y ] [ input ]
Rotate rotates the image in its input picture file (default standard input) clockwise by
angle degrees, writing the resulting picture file on standard output.
Transpose turns its input picture file on its side by reflection through its major
(descending from left to right) diagonal, writing the resulting picture file on standard
output. If no file name is given, the picture is read from standard input. Options yield
all possible symmetries of the square grid:
-d reflects the image through its descending diagonal (the default).
-a reflects the image through its ascending diagonal.
-v reflects the image left-to-right through its vertical center line.
-h inverts the image top-to-bottom through its horizontal center line.
-r rotates the image to the right (clockwise) 90 degrees.
-l rotates the image to the left (counterclockwise) 90 degrees.
-u rotates the image upside down (180 degrees).
-i identity transformation (for completeness only.)
-o x y translates by (x,y). Without -o, the input and output files have the same upper-
Transpose is particularly useful to convince programs that work on the rows of a picture
file to operate on columns. For example
fb/transpose big |
fb/resample 48 |
fb/resample 48 >tiny
makes a tiny 48x48 version of a big picture.
Very large images may not fit in memory. The result of rotate is not anti-aliased.
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