resizing images

[Anon]

OK I have read the manual for the function imagecopyresized();

I am not happy with the explination given, could some onegive me an intuitive realworld example how this works.

I am building a realestate application where I will need to resize all .jpgs(photos of homes) that are uploaded to the website.

So if the uploaded image size is 640X480

I want to dynamically resize the image to 150X113

how do I do this with PHP GD? is it imagecopyresized or another function, I cannot add any librarys to the server I am using so the following specs will have to be the solution guideline

Redhat Linux 6.1
php 4.0.6
gd 2.0
apache

Thnaks for your help in advance

[Anon]

No wthat I have the attentoin of some who knows something I will try to explain this a little better than before

I am trying to upload images from a <form> and then resize the image 2 different times and creates 2 diffrent image files, and then upload the new image files that I resized into 2 different directories.

I want to do this so I will have a thumbnail and a full sized image of the same photo(for catalog application, click on thumbnail and see full sized image)

***************Curent Proccess*************

Step 1. Get image from user**************************

<form enctype="multipart/form-data" action="$PHP_SELF?>?session_id=<?=$session_id?>&action=<?=$action?>" method="post">
<input type="hidden" name=MAX_FILE_SIZE value=100000000>
<input type="File" name="userfile" size="30" accept="image/jpeg, image/pjpeg">
<input type="hidden" name="newname" size="30" maxlength="^255" value="image">

<input type="submit" name="submit"
value="Add Listing">

Step 2.Upload Image to server****************************
//Creates Uniqe name for image
$newname = date("Hisz");

//Uploads Image to directory on server
function do_upload($userfile,$newname)
{
$new_file = "/agents/$newname.jpg";

if (!copy($userfile, $new_file)) echo "failed to copy file $userfile to $new_file\n";
return;
}

*************Target Process(what I need to happen)*********

I want to create 2 images with different sizes and then upload them into 2 different directories

resize 1.*******************************
with=150
height=113
directory=/thumnails/$newname.jpg

resize 2. *******************************
width=300
height=225
directory=/agents/$newname.jpg

***************Ideal Process******************************
Step 1/Get Image from User

Step 2/resize image into thumnail(with=150 height=113) and upload to /thumbnails/$newname.jpg

Step 3/resize image into standard larger size(with=300 height=225) and upload to /agents/$newname.jpg

**********Other Comments*****************
I have been messing around with imagecopyresized() and have no Idea what I am doing I do have GD 2.0 installed , I would appreciate some help wit this I am loosing lots of time trying to figure this out and have no expert help available to me

Thanks For Your Help

*********Specs***********
RedHat inux 6.1
PHP 4.0.6
Apache
GD 2.0

[Anon]

Well, the documentation is clear enough for me - once I realised that it can also be used for cropping and copying sections of images - though for some reason the documentation doesn't say what it returns.

I take it you've created an image of the right size with imagecreatefromjpeg() or whatever, and for the sake of argument we'll assume you called it $source_image.

I take it also you've created a 150x113 thumbnail image the same way, calling it $thumbnail.

You've obtained the size of the source image with getimagesize(), and got the width and height in $source_width and $source_height.

The dox say:

int imagecopyresized (int dst_im, int src_im, int dstX, int dstY, int srcX, int srcY, int dstW, int dstH, int srcW, int srcH)

and for the purpose outlined above, the arguments are:

dst_im = $thumbnail - the thumbnail image you're creating

src_im = $source_image - the image you're copying

dstX, dstY, srcX, srcY are all = 0 - we're neither cropping nor offsetting, so we want to start by copying the top-left corner of the source image into the top-left corner of the thumbnail image.

dstW and dstH are = 150 and 113, respectively - we want to fill the thumbnail image wall-to-wall.

srcW, srcH = $source_width and $source_height, respectively - we want to copy the entire source image.

In short: imagecopyresized ($thumbnail, $source_image, 0, 0, 0, 0, 150, 113, $source_width, $source_height)

Just one more thing to keep in mind: $thumbnail and $source_image are both gd_lib image handles, not files.

[Anon]

Well this dosent help me I am still not clear how to create a new in=mage and save t to a directory, I dont understand the documentation imagecreatefromjpg()? how dows this work, I think the documentation is NOT CLEAR and I need a realworld example of exactly how this works not

"I take it you've created an image of the right size with imagecreatefromjpeg() or whatever, and for the sake of argument we'll assume you called it $source_image.
"

This does not help for the fact that I dont know how to creata a new image and save it to a directory

[khaine]

<?php

function make_thumb($imagefile, $new_w=75, $new_h=75)
{

// first get the source image details.
$img_data=getimagesize($imagefile);
$src_w=$img_data[0];
$src_h=$img_data[1];

// now get the source image and store it in memory.
$src_img=ImageCreateFromPNG($imagefile) or die ("Cannot open source");

// create a target for the image at the required size.
$dst_img=imagecreate($new_w,$new_h);

// copy it over.
imagecopyresized($dst_img,$src_img, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src
_h);

// switch to the thumbnail directory
chdir("thumbnails");

// If the thumb already exists blow it away.
if ( file_exists("thumb".$imagefile) )
{
unlink("thumb".$imagefile);
}

// store the image into the directory as a png with the prefix thumb
imagepng($dst_img,"thumb".$imagefile);

// free up memory
ImageDestroy($src_img);
ImageDestroy($dst_img);

}

make_thumb("music26.png");

?>

It will take the image name given and create a thumbnail in a directory called thumbnails.

It only deals with png images cause thats all I ever needed. I also dont have the jpeg library but you should be able to alter it to use jpeg images easy enough.

Mark.