Hey Fred,
That's awesome, thanks for all the hard work. I'm sure that others will
benefit from this as well.
Dave
On Feb 17, 2008 8:18 PM, Fred Weinhaus <[EMAIL PROTECTED]> wrote:
> Dave,
>
> OK, the same script below works for the the other aspect ratio,
> namely 130x180. I have tested it on images of sizes 600x390 (wider
> than tall - aspect=1.53846), 256x256 (square - aspect=1) and 400x520
> (tall than wide - aspect=.76923 and aspect=.69230) for the cases of
> daspect=180/130=1.38461 and daspect=130/180=.72222. Note that I
> added/moved +repage just after $infile and just before $outfile to be
> sure that the virtual canvas was reset/removed from the infile and
> before creating the outfile; otherwise, things do not work out if the
> virtual canvas is not exactly the size of the input image.
>
>
> #!/bin/bash
>
> infile="your_infile"
> outfile="your_outfile"
>
> dwidth=130 # desired thumbnail width
> dheight=180 #desired thumbnail height
>
>
> width=`identify -format "%w" $infile` # actual image width
> height=`identify -format "%h" $infile` # actual image height
> aspect=`echo "scale=5; $width / $height" | bc` # actual image aspect
> ratio
> daspect=`echo "scale=5; $dwidth / $dheight" | bc` # desired
> thumbnail aspect ratio
>
> test1=`echo "$aspect > $daspect" | bc` # returns 1 if true and 0 if false
> test2=`echo "$aspect >= 1" | bc` # returns 1 if true and 0 if false
>
> if [ $test1 -eq 1 ]
> then
> echo "aspect larger than desired aspect (wider than tall)"
> resize="${dheight}x${dheight}^"
> elif [ $test2 -eq 1 ]
> then
> echo "aspect less than desired aspect (wider than tall) but
> greater than 1"
> resize="${dwidth}x${dwidth}"
> else
> echo "aspect less than 1 (taller than wide)"
> resize="${dwidth}x${dwidth}^"
> fi
>
> convert $infile +repage -resize $resize \
> -gravity Center -crop ${dwidth}x${dheight}+0+0 +repage $outfile
>
>
>
> Note the use of the ^ in cases 1 and 3
>
> I will try to make a proper script of this over the next few days and
> add it to my script page.
>
>
> Fred
>
--
David Di Biase
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