Thanks for posting this Robert, I have a shell script that crawls the
filesystem and does "converts" to create thumbs of various sizes. The
original uploads can be quite large, and i think the -size option will
help speed that script up quite a bit.
/John
Robert Garcia wrote:
Yes, I have seen that, what I meant, was it was not documented by IM
at all, at least I have not seen it. And it is only referenced in a
few articles, like this, i have only seen this and one more.
I have doing it for some time, but for the life of me completely
forgot it when I was working on the bean.
Also, I have found, there is no reason to ask for double the size. You
get best performance when you ask for as little as possible. And there
is no loss in quality, and I do this for pro photographers, who are
VERY picky, even about thumbnails.
I can't even use thumbnail for them, I use resize, with a specific
blur value and the lanczos filter/algorithm for the highest possible
quality.
--
Robert Garcia
President - BigHead Technology
VP Application Development - eventpix.com
13653 West Park Dr
Magalia, Ca 95954
ph: 530.645.4040 x222 fax: 530.645.4040
[EMAIL PROTECTED] - [EMAIL PROTECTED]
http://bighead.net/ - http://eventpix.com/
On Apr 28, 2006, at 8:39 AM, William M Conlon wrote:
See http://www.cit.gu.edu.au/~anthony/graphics/imagick/thumbnails/
<quote>General Thumbnail Creation
Generate Thumbnails to a specific height
Lets convert a large sample JPEG image to a GIF thumbnail 90 pixels
high, with the width automatically adjusted (within the 250 pixel
width limit) preserve the aspect ratio of the image.
convert -size 500x180 hatching.jpg -thumbnail 250x90 height.gif
[IM Output]
Note that I used the "-thumbnail" option above. This not only resizes
the image, but strips any and all profile and comment information
that may be present in the original JPEG image.
I also set a minimum "-size" for the image being read in. This is
passed to the JPEG library, which will return an image somehere
between this size and double this size (if posible), rather that the
whole very large original image. Basically don't overflow the
computers memory with an huge image when it isn't needed.
The "-size" value I use is double that of the final thumbnail so that
resize will still generate an reasonable result.
</quote>
On Apr 28, 2006, at 7:06 AM, Robert Garcia wrote:
So anyway, ImageMagick support this hinting. It is NOT documented
anywhere, as far as I know, I just stumbled on it.
Bill
William M. Conlon, P.E., Ph.D.
To the Point
345 California Avenue Suite 2
Palo Alto, CA 94306
vox: 650.327.2175 (direct)
fax: 650.329.8335
mobile: 650.906.9929
e-mail: mailto:[EMAIL PROTECTED]
web: http://www.tothept.com
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