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diff --git a/pamarith.html b/pamarith.html index 7bb20ee2..17bb4558 100644 --- a/pamarith.html +++ b/pamarith.html @@ -2,7 +2,7 @@ <html><head><title>Pamarith User Manual</title></head> <body> <h1>pamarith</h1> -Updated: 17 October 2020 +Updated: 24 October 2020 <br> <a href="#index">Table Of Contents</a> @@ -18,6 +18,7 @@ pamarith - perform arithmetic on two Netpbm images <b>-equal</b> | <b>-compare</b> | <b>-and</b> | <b>-or</b> | <b>-nand</b> | <b>-nor</b> | <b>-xor</b> | <b>-shiftleft</b> | <b>-shiftright</b> +[<b>-closeness=</b><i>N</i>] <i>pamfile1</i> <i>pamfile2</i> ... <p>All options can be abbreviated to their shortest unique prefix. @@ -234,6 +235,10 @@ may claim two values are not equal when in fact they are, because of the precision with which it does the arithmetic. However, it will never say A is greater than B if A is less than B. +<p>You can make the equality test approximate with the <b>-closeness</b> +option. This gives the percentage of maxval by which the samples can +differ and still be considered equal. + <p><b>-equal</b> was new in Netpbm 10.93 (December 2020). <dt><b>-compare</b> @@ -266,6 +271,16 @@ number of bit positions to shift. <p>Note that the maxval (see <a href="#maxval">Maxval</a>) determines the width of the frame within which you are shifting. +<h3 id="otheroptions">Other</h3> + +<dl compact> + +<dt><b>-closeness</b> +<dd>This changes the meaning of <b>-equal</b>. It is not valid with any +other function. See the description of <b>-equal</b>. + +</dt> + </dl> <h2 id="seealso">SEE ALSO</h2> |