[ciapug] images

[Blake Norrell]

Heres a function I used to handle file uploads for a car site I work on.
 It will resize the image (and keep the aspect ratio) based on the $w
and $h parameters passed to it.  The $img field is just
$_FILES['uploaded_file_name']['tmp'].  If the image being uploaded
(120x90) is actually smaller than the parameters entered (say 400x300),
it will create a new image (400x300) with the original now centered on a
white background:

function createImage($img,$w,$h)
{
   $dx=$dy=0;
   $imagedata = getimagesize($img);
   if($imagedata[0]>$w && $imagedata[1]>$h){
     if ($w && ($imagedata[0] < $imagedata[1])) 
     {
       $dw = ($h / $imagedata[1]) * $imagedata[0];
	   $dh=$h;
     }
     else 
     {
       $dh = ($w / $imagedata[0]) * $imagedata[1];
	   $dw=$w;
     }
   } else {
	 $dx=(0.5*$w)-(0.5*$imagedata[0]);
	 $dy=(0.5*$h)-(0.5*$imagedata[1]);
	 $dw=$imagedata[0];
	 $dh=$imagedata[1];
   }
   $im2 = ImageCreateTrueColor($w,$h);
   imagefill($im2, 0, 0, 0xFFFFFF);
   $image = ImageCreateFromJpeg($img);
   imagecopyResampled ($im2, $image, $dx, $dy, 0, 0, $dw, $dh,
$imagedata[0], $imagedata[1]);
   ImageJpeg($im2, "$my_new_img, 70);
   imagedestroy($im2);
   imagedestroy($image);
}	


>>> Tony Bibbs <tony at tonybibbs.com> 8/3/2006 12:43 pm >>>
Good points.  I believe that library enforces keeping the aspect ratio,

too.

--Tony

David Champion wrote:
> I would resize the image at upload time (using something like what
Tony 
> posted). Be careful of aspect ratio - the uploader I've used (in 
> vbscript - sorry) would let you specify the vertical limit, then
scale 
> to keep the aspect ratio.
> 
> End users typically don't know / don't care about image sizes and
such - 
> they'll upload full resolution images from their shiny new 7mp
camera, 
> then complain when they take too long to load.
> 
> -dc
> 
> Dave J. Hala Jr. wrote:
>> I'm working on a site for dog adoptions. I'd like to track some
basic
>> information about the dog along with its photo. An admin will upload
a
>> image and type in the basic information. The home page will look in
the
>> database and display the dogs bio for the all the homeless dogs.
>>  
>> My concern is regarding the image of the dog. What I want to avoid
is
>> having to deal with a bunch of oddly sized images, etc.  I'm
considering
>> putting together some criteria for the admin to use when uploading
the
>> image. I was considering forcing the image size using the height
and
>> width tags in my html. My concern is that it still leaves a lot of
room
>> for an admin to do some bad things.
>>
>> Anyone have any thoughts/experience on this issue?
>>
>> :) Dave
>>
> 
> 
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