The following seems to work for me and is a bit simpler. I tried four
images of sizes: 180x118, 142x216, 50x33 and 33x50.
convert image.jpg -thumbnail x60 -resize '60x<' \
-gravity center -crop 60x60+0+0 +repage image_60x60c.jpg
In either case (your method or mine above), you are losing a little
resolution (making the result a bit blurry) for images that are
taller than wide, as the thumbnail step resizes the image so that the
larger dimension is 60 and then the subsequent resize expands the
image so that the smaller dimension is 60. Thus the image has been
over-shrunk and then is made larger again.
So another way to do it is to script finding the image's width and
height and then do the right thing for the correct dimension so that
the smaller dimension is key and the re-expand is not needed.
width=`identify -format "%w" image.jpg`
height=`identify -format "%h" image.jpg`
if [ $width -gt $height ]
then
convert image.jpg -thumbnail x60 \
-gravity center -crop 60x60+0+0 +repage image_60x60c.jpg
else
convert image.jpg -thumbnail 60x \
-gravity center -crop 60x60+0+0 +repage image_60x60c.jpg
Or you can do the following
size=60
width=`identify -format "%w" image.jpg`
height=`identify -format "%h" image.jpg`
[ $width -gt $height ] && factor="x${size}" || factor="${size}x"
convert image.jpg -thumbnail $factor \
-gravity center -crop ${size}x${size}+0+0 +repage image_60x60c.jpg
Hey guys and gals,
This is what I am doing now to take an image of any ratio and make a 60x60
thumbnail out of it.
> convert -size 240x240 test.jpg -thumbnail x120 -resize '120x<' -resize 50%
-gravity center -crop 60x60+0+0 +repage test_60x60.jpg
I was wondering if their was a much simpler way of doing this?
Thanks :-)
--
John Kopanas
john at kopanas.com
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