Using ImageMagick to Resample Images

SurgeProto

I was wondering if there is a way to mandate the size that imagemagick makes an image. I'm currently using the following code:

$make_magick = system("convert -size 88x88 galleries/$a_img[$x] -resize 88x88 galleries/tn/$a_img[$x]", $retval);

However imagemagick makes sure the image is proportional. I need to make sure the image is exactly 88x88. Does anyone have source code that can crop the image to a perfect square and then resize? Any help on this is greatly appreciated. I don't care what part of the image is cutoff, I just need to make it a perfect square and resize it.

Weedpacket

Well I trundled over to the obvious place to look for information on this subject, not having ImageMagick myself or any of its documentation right now, and found (among much else), this.

briansol

here's a function i use on my gallery to get the image size:

function get_sizes($src_w, $src_h, $dst_w,$dst_h ){
	//src_w ,src_h-- start width and height
	//dst_w ,dst_h-- end width and height
	//return array  w=>new width h=>new height mlt => multiplier
	//the function tries to shrink or enalrge src_w,h in such a way to best fit them into dst_w,h
	//keeping x to y ratio unchanged
	//dst_w or/and dst_h can be "*" in this means that we dont care about that dimension
	//for example if dst_w="*" then we will try to resize by height not caring about width 
	//(but resizing width in such a way to keep the xy ratio)
	//if both = "*" we dont resize at all.
	#### Calculate multipliers
	$mlt_w = $dst_w / $src_w;
	$mlt_h = $dst_h / $src_h;

$mlt = $mlt_w < $mlt_h ? $mlt_w:$mlt_h;
if($dst_w == "*") $mlt = $mlt_h;
if($dst_h == "*") $mlt = $mlt_w;
if($dst_w == "*" && $dst_h == "*") $mlt=1;

#### Calculate new dimensions
$img_new_w =  round($src_w * $mlt);
$img_new_h =  round($src_h * $mlt);
return array("w" => $img_new_w, "h" => $img_new_h, "mlt_w"=>$mlt_w, "mlt_h"=>$mlt_h,  "mlt"=>$mlt);
}

SurgeProto

I added the following chunk of code into my loop to crop the image:

$make_magick = system("convert -crop $current_img_width x $current_img_height galleries/$a_img[$x] galleries/$thumb_name", $retval);

It runs without any errors but the new image isn't cropped at all, it remains the same size. Anyone do this before?