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Diffstat (limited to 'pamarith.html')
-rw-r--r-- | pamarith.html | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/pamarith.html b/pamarith.html index f79e2cde..9bd5c1a1 100644 --- a/pamarith.html +++ b/pamarith.html @@ -145,7 +145,8 @@ maxval. <h3 id="operations">The Operations</h3> -<p>Most of the operations are obvious from the option name. +<p>Most of the operations are obvious from the option name. The following +paragraphs cover those that aren't. <P><B>-subtract</B> subtracts a value in the right input image from a value in the left input image. @@ -178,8 +179,11 @@ say A is greater than B if A is less than B. <p><b>-compare</b> was new in Netpbm 10.13 (December 2002). <p><b>-and</b>, <b>-nand</b>, <b>-or</b>, <b>-nor</b>, and <b>-xor</b> -consider the input and output images to contain bit strings; they compute -bitwise logic operations. +consider the input and output images to contain bit strings; they +compute bitwise logic operations. Note that if the maxval is 1, you +can also look at these as logic operations on boolean input values. +See section <a href="#maxval">Maxval</a> for the special meaning of +maxval with respect to bit string operations such as these. <p><b>-shiftleft</b> and <b>-shiftright</b> consider the left input image and output image to contain bit strings. They compute a bit |