Annotated edit history of
pgmedge(1) version 1, including all changes.
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perry |
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pgmedge |
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!!!pgmedge |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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SEE ALSO |
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AUTHOR |
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---- |
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!!NAME |
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pgmedge - edge-detect a portable graymap |
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!!SYNOPSIS |
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__pgmedge__ [[''pgmfile''] |
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!!DESCRIPTION |
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Reads a portable graymap as input. Outlines the edges, and |
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writes a portable graymap as output. Piping the result |
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through __pgmtopbm -threshold__ and playing with the |
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threshold value will give a bitmap of the |
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edges. |
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The edge detection technique used is to take the Pythagorean |
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sum of two Sobel gradient operators at 90 degrees to each |
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other. For more details see |
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The maxval of the output is the same as the maxval of the |
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input The effect is better with larger maxvals, so you may |
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want to increase the maxval of the input by running it |
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through __pnmdepth__ first. |
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!!SEE ALSO |
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pgmenhance(1), pgmtopbm(1), |
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pnmdepth(1), pgm(5), |
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pbm(5) |
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!!AUTHOR |
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Copyright (C) 1991 by Jef Poskanzer. |
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