[magick-users] Resizing to minimum res and filter question

[Fred Weinhaus]

I believe the documentation is in error!  The ''<", is supposed to 
work if you want to expand an image, not reduce it, to my knowledge.



The docs says:

widthxheight<
Change dimensions only if both specified dimensions exceed image dimensions.

but should say
widthxheight<
Change dimensions only if both specified dimensions DO NOT exceed 
image dimensions.


Lanczos is probably best for minimizing. Anthony believes Mitchell is 
better for maximizing.

See

http://www.imagemagick.org/Usage/resize/#filter_windowed
http://www.imagemagick.org/Usage/resize/#filter_cubics



>Some help would be wonderful, the help files/references are usually really
>good for solving this quickly, but I can't seem to find a proper solution
>myself. The right push would be nice :-)
>
>On Sat, Mar 28, 2009 at 3:41 PM, David Di Biase <dave.dibiase at 
>gmail.com>wrote:
>
>>  Hi there,
>>
>>
>>  I'm writing  a script to pump random images to my users browsers (Flash
>>  application). I'm doing this in PHP and converting usually 1k-2k image files
>>  on the fly to a standard set of monitor sizes then caching them (to not kill
>>  my server). This is the original line I was using:
>>
>>  shell_exec("convert {$file} -filter Lanczos -quality 50% -resize
>>  '{$browser[1]}x{$browser[2]}<' '{$file_generated}'");
>>
>>  Say I set my dims to 1024x768 the file generated is ending up as 1900x1200
>>  for some reason. My goal is to resize an image within the minimum set
>>  dimension and keep the aspect ratio as is.
>>
>>  The other question I have is, what's the best resize filter for large
>>  images (of usually TIFF format)? I'm using Lanczos at the moment but I was
>>  wondering if there was something better.
>>
>>  Thanks,
>>
>>  Dave
>>