note 69042 added to function.imagecopyresized
| From: | ob at babcom dot biz | Date: | Mon, 21 Aug 2006 11:32:01 +0000 |
| Subject: | note 69042 added to function.imagecopyresized | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-116118@lists.php.net to get a copy of this message | ||
Regarding the note and function of kyle.florence on August 3rd 2006:
I tried to use his function resizejpeg() for resizing images in my gallery. As far as I can tell it
contains a small bug.
Resizing worked fine as long as I had the same maximum width and maximum height specified. Wanting
all thumbnails to have the same height - so my images would appear in a straight line on my website
both in portrait format and in landscape format - I soon encountered the problem that resizing with
different values of maximum width and maximum height would not work proberly.
If you are using the script change the following 2 lines where the resized width and the resized
height are calculated:
<?php
$rs_h = $ratio * $max_h;
?>
should be:
<?php
$rs_h = $ratio * $rs_w;
?>
and:
<?php
$rs_w = $max_w / $ratio;
?>
should be:
<?php
$rs_w = $rs_h / $ratio;
?>
The following function is based on Kyle Florence's function. I left out the thumbnail-part and
rather added the possibiliy of defining a new dir and new filename for the image. If you need to
resize and then create a thumbnail just run the function twice. Here, the thumbnail will contain the
full picture and not a cutout of the original image.
The function supports JPG, GIF and PNG resizing. The quality in case of JPG is given to the function
as the last parameter $Quality.
The variable names should speak for their usage.
<?php
function Resize($Dir,$Image,$NewDir,$NewImage,$MaxWidth,$MaxHeight,$Quality) {
list($ImageWidth,$ImageHeight,$TypeCode)=getimagesize($Dir.$Image);
$ImageType=($TypeCode==1?"gif":($TypeCode==2?"jpeg":
($TypeCode==3?"png":FALSE)));
$CreateFunction="imagecreatefrom".$ImageType;
$OutputFunction="image".$ImageType;
if ($ImageType) {
$Ratio=($ImageHeight/$ImageWidth);
$ImageSource=$CreateFunction($Dir.$Image);
if ($ImageWidth > $MaxWidth || $ImageHeight > $MaxHeight) {
if ($ImageWidth > $MaxWidth) {
$ResizedWidth=$MaxWidth;
$ResizedHeight=$ResizedWidth*$Ratio;
}
else {
$ResizedWidth=$ImageWidth;
$ResizedHeight=$ImageHeight;
}
if ($ResizedHeight > $MaxHeight) {
$ResizedHeight=$MaxHeight;
$ResizedWidth=$ResizedHeight/$Ratio;
}
$ResizedImage=imagecreatetruecolor($ResizedWidth,$ResizedHeight);
imagecopyresampled($ResizedImage,$ImageSource,0,0,0,0,$ResizedWidth,
$ResizedHeight,$ImageWidth,$ImageHeight);
}
else {
$ResizedWidth=$ImageWidth;
$ResizedHeight=$ImageHeight;
$ResizedImage=$ImageSource;
}
$OutputFunction($ResizedImage,$NewDir.$NewImage,$Quality);
return true;
}
else
return false;
}
?>
Before calling the function support for JPG, PNG or GIF should be checked.
----
Server IP: 66.163.161.117
Probable Submitter: 84.185.240.41
----
X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER
autolearn=no version=2.64
----
Manual Page -- http://www.php.net/manual/en/function.imagecopyresized.php
Edit -- https://master.php.net/note/edit/69042
Del: integrated -- https://master.php.net/note/delete/69042/integrated
Del: useless -- https://master.php.net/note/delete/69042/useless
Del: bad code -- https://master.php.net/note/delete/69042/bad+code
Del: spam -- https://master.php.net/note/delete/69042/spam
Del: non-english -- https://master.php.net/note/delete/69042/non-english
Del: in docs -- https://master.php.net/note/delete/69042/in+docs
Del: other reasons-- https://master.php.net/note/delete/69042
Reject -- https://master.php.net/note/reject/69042
Search -- https://master.php.net/manage/user-notes.php