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Change-Id: I9130e7d10ae42e894923097a7c97da802eb0d8c3 Reviewed-on: https://plan9port-review.googlesource.com/2962 Reviewed-by: Russ Cox <rsc@swtch.com>
58 lines
1.1 KiB
Groff
Executable file
58 lines
1.1 KiB
Groff
Executable file
.TH RESAMPLE 1
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.SH NAME
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resample \- resample a picture
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.SH SYNOPSIS
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.B resample
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[
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.B -x
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.I size
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] [
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.B -y
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.I size
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] [
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.I file
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]
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.SH DESCRIPTION
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.I Resample
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resamples its input image (default standard input) to a new size.
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The image is decimated or interpolated using
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a Kaiser window.
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.PP
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The size of the resampled image can be specified
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with the
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.B -x
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and
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.B -y
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options.
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An unadorned value sets the number of pixels of that dimension; a suffixed percent sign specifies a percentage.
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If only one of
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.B -x
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or
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.B -y
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is given, the other dimension is scaled to preserve
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the aspect ratio of the original image.
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Thus,
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.B -x50%
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will reduce the image to half its original dimension in both
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.B x
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and
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.BR y .
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.PP
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The input should be a Plan 9 image
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as described in
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.IR image (7),
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and the output will be a compressed 24-bit
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.B r8g8b8
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image.
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To uncompress the image or change the pixel format, use
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.I iconv
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(see
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.IR crop (1)).
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.PP
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.SH SOURCE
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.B \*9/src/cmd/resample.c
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.SH "SEE ALSO
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.IR crop (1),
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.IR image (7)
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.SH BUGS
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Faster algorithms exist, but this implementation produces correct pictures.
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