resizing photo to a standard width

Anon

I am in the process of porting over a fairly large site from cold fusion to PHP.

I can reproduce everything except an custom tag in cold fusion that automatically resizes photos to a width of 320 when the user submits their photo, and adjusts the height.

I know there has to be a way to do that in PHP, but I am unable to duplicate this method.

Any ideas?

Thanks,
Dan Martin

Anon

PHP can do it if it is compiled with GD (and jpeg-6b module, assuming you are using JPG format) or something like ImageMagick.

ImageMagick has a nice utility called nconvert that I use. Here is how I do it with nconvert.

exec("/usr/bin/nconvert -quiet -out jpeg -q 100 -ratio -o /var/www/images/image.jpg -resize 320 240 /var/www/images/image.jpg");

using the -ratio switch ensures the image will not be distorted if the user submits an image that is not standard width to height ratio.

Anon

Could you give some example of the actual php script which uses ImageMagick?

Let's say i have a uplaoded an JPG image uploaded via form field called "uploadpic".. so what is the right way to manipulate this $uploadpic with PHP and ImageMagick to resize it's width for example to 100px?

Anon

I made a mistake, Nconvert is not an ImageMagick utility. ImageMagick\'s utility is called convert. Nconvert was originally a part of Xnview if i remember correctly.

However, nconvert is a free and very easy to use command line image manipulation too.

Use the exec() function to send the command line to the nconvert program. There are hundreds of switches for it, but to do simple resizing refer to my previous post. Basically, pass the path to the program, and the path to the images and specify your new sizes. The switches are pretty self explanatory. Use -ratio to force the width:height ratio to stay the same.

Anon

Thanks David this sounds exactly like what I need. I found all the documentation for this with your help, and I amazed how much more versatile PHP is to cold fusion...which is suprising given the price tags.

--Dan--