convert and poor quality on resize

Hi,

I'm using ImageMagick's "convert" command line
tool to generate medium sized 
versions of my photos (jpeg's). My trouble is no matter
what settings I try 
I always end up with a slightly blurred version of the
original. My goal is 
to reach the same quality as Flickr is doing with its
conversion.

To compare:

http:/
/www.inxsoft.net/tmp/dscn4372-flickr.jpg

# convert -quality 100 -geometry 500x375 dscn4372.jpg
dscn4372-convert.jpg
http:
//www.inxsoft.net/tmp/dscn4372-convert.jpg

The original:
http://www.in
xsoft.net/tmp/dscn4372.jpg

# convert --version
Version: ImageMagick 6.2.9 08/28/06 Q16 http://www.imagemagick.org

Copyright: Copyright (C) 1999-2006 ImageMagick Studio LLC

I also tried "resize" and "size" but
the result is the same. I'm using the 
latest versions of the anything linked to ImageMagick.

Any help to reach the same quality as Flickr does is highly
appreciated.

Kind Regards,
Thomas
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Thomas Kuiper on  wrote...
| Hi,
| 
| I'm using ImageMagick's "convert" command
line tool to generate medium sized 
| versions of my photos (jpeg's). My trouble is no matter
what settings I try 
| I always end up with a slightly blurred version of the
original. My goal is 
| to reach the same quality as Flickr is doing with its
conversion.
| 
| To compare:
| 
| http:/
/www.inxsoft.net/tmp/dscn4372-flickr.jpg
| 
| # convert -quality 100 -geometry 500x375 dscn4372.jpg
dscn4372-convert.jpg
| http:
//www.inxsoft.net/tmp/dscn4372-convert.jpg
| 
| The original:
| http://www.in
xsoft.net/tmp/dscn4372.jpg
| 
| # convert --version
| Version: ImageMagick 6.2.9 08/28/06 Q16 http://www.imagemagick.org

| Copyright: Copyright (C) 1999-2006 ImageMagick Studio LLC
| 
| I also tried "resize" and "size"
but the result is the same. I'm using the 
| latest versions of the anything linked to ImageMagick.
| 
| Any help to reach the same quality as Flickr does is
highly appreciated.
| 
You can reduce the blur aspect of resize operations using
the
  -filter   and/or  -support  settings.

See IM Examples, Resize filter and support
  http://www.cit.gu.edu.au/~anthony/graphics/ima
gick6/resize/#filter

  Anthony Thyssen ( System Programmer )    <A.Thyssengriffith.edu.au>
 -----------------------------------------------------------
------------------
You're traveling through another dimension -- a dimension
not only of sight and
sound but of mind. A journey into a wonderous land whose
boundaries are that of
imagination.  That's a signpost up ahead: your next stop:
the Twilight Zone!
 -----------------------------------------------------------
------------------
     Anthony's Home is his Castle     http://www.cit.gu.
edu.au/~anthony/
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-users

Anthony Thyssen wrote:
> Thomas Kuiper on  wrote...
> | Hi,
> | 
> | I'm using ImageMagick's "convert"
command line tool to generate medium sized 
> | versions of my photos (jpeg's). My trouble is no
matter what settings I try 
> | I always end up with a slightly blurred version of
the original. My goal is 
> | to reach the same quality as Flickr is doing with its
conversion.
> | 
> | To compare:
> | 
> | http:/
/www.inxsoft.net/tmp/dscn4372-flickr.jpg
> | 
> | # convert -quality 100 -geometry 500x375 dscn4372.jpg
dscn4372-convert.jpg
> | http:
//www.inxsoft.net/tmp/dscn4372-convert.jpg
> | 
> | The original:
> | http://www.in
xsoft.net/tmp/dscn4372.jpg
> | 
> | # convert --version
> | Version: ImageMagick 6.2.9 08/28/06 Q16 http://www.imagemagick.org

> | Copyright: Copyright (C) 1999-2006 ImageMagick Studio
LLC
> | 
> | I also tried "resize" and
"size" but the result is the same. I'm using
the 
> | latest versions of the anything linked to
ImageMagick.
> | 
> | Any help to reach the same quality as Flickr does is
highly appreciated.
> | 
> You can reduce the blur aspect of resize operations
using the
>   -filter   and/or  -support  settings.
> 
> See IM Examples, Resize filter and support
>   http://www.cit.gu.edu.au/~anthony/graphics/ima
gick6/resize/#filter
> 

Hi Anthony,

the "-filter" and "-support"
arguments didn't do much diffrence but that 
page lead me to "-adaptive-resize" which
resulted in a much sharper and less 
blurry result, similiar to the one of Flickr.

Thanks for your help,
Thomas
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-users

On Monday 28 August 2006 07:39, Thomas Kuiper wrote:
>
> Hi Anthony,
>
> the "-filter" and "-support"
arguments didn't do much diffrence but that
> page lead me to "-adaptive-resize" which
resulted in a much sharper and
> less blurry result, similiar to the one of Flickr.

I have been struggeling with the same problem. I checked,
but my convert does 
not have any "-adaptive-resize" (-help does not
list that option).

When was -adaptive-resize added to convert?

-- 
Jørn Dahl-Stamnes
homepage: http://www.dahl-st
amnes.net/dahls/

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=?iso-8859-1?q?J=F8rn_Dahl-Stamnes?= on  wrote...
| On Monday 28 August 2006 07:39, Thomas Kuiper wrote:
| >
| > Hi Anthony,
| >
| > the "-filter" and "-support"
arguments didn't do much diffrence but that
| > page lead me to "-adaptive-resize" which
resulted in a much sharper and
| > less blurry result, similiar to the one of Flickr.
| 
| I have been struggeling with the same problem. I checked,
but my convert does 
| not have any "-adaptive-resize" (-help does
not list that option).
| 
| When was -adaptive-resize added to convert?
| 
In the very last release.

  Anthony Thyssen ( System Programmer )    <A.Thyssengriffith.edu.au>
 -----------------------------------------------------------
------------------
   "Simplicity has a habit of expanding into
catastrophe."
                                  -- Anne McCaffrey, 
"The Ship who Sang"
 -----------------------------------------------------------
------------------
     Anthony's Home is his Castle     http://www.cit.gu.
edu.au/~anthony/
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