php resize image on upload
You can use this library to manipulate the image while uploading. http://www.verot.net/php_class_upload.htm
PHP upload and resize image
You can use the PHP GD library to resize an image on upload.
The following code should give you an idea of how to implement the resize:
// Get the image info from the photo
$image_info = getimagesize($photo);
$width = $new_width = $image_info[0];
$height = $new_height = $image_info[1];
$type = $image_info[2];
// Load the image
switch ($type)
{
case IMAGETYPE_JPEG:
$image = imagecreatefromjpeg($photo);
break;
case IMAGETYPE_GIF:
$image = imagecreatefromgif($photo);
break;
case IMAGETYPE_PNG:
$image = imagecreatefrompng($photo);
break;
default:
die('Error loading '.$photo.' - File type '.$type.' not supported');
}
// Create a new, resized image
$new_width = 180;
$new_height = $height / ($width / $new_width);
$new_image = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
// Save the new image over the top of the original photo
switch ($type)
{
case IMAGETYPE_JPEG:
imagejpeg($new_image, $photo, 100);
break;
case IMAGETYPE_GIF:
imagegif($new_image, $photo);
break;
case IMAGETYPE_PNG:
imagepng($new_image, $photo);
break;
default:
die('Error saving image: '.$photo);
}
Resize image on upload
You should try using GD.
// Loads the image
$img = imagecreatefromjpeg($_FILES["immagine"]["tmp_name"]); // Assuming it's a jpeg
// Creates a image to put the thumbnail
$tmp_img = imagecreatetruecolor(<thumbnail width>, <thumbnail height>)
// Resizes the image
imagecopyresampled ( $tmp_img, $img, 0, 0, 0, 0, <thumbnail width>, <thumbnail height>, <original width>, <original height>); // The zeroes are the offsets
// Starts output buffer to not let the image reach the browser
ob_start();
// Render the image
imagejpeg($tmp_image);
// Capture the image data
$imageData = ob_get_clean();
PHP Resize Uploaded Image To Specific Dimensions Without Cropping
Ended up correcting this. The issue was how I was calculating and compensating for ratios. This was the final code that corrected the issue, with variables to make the code more versatile for other situations
$targetWidth = 600;
$targetHeight = 360;
$dstY = 0;
$dstX = 0;
$ratioFactor = 0;
$bgImage = imagecreatefromjpeg("../img/bgWhite.jpg");
$dimensions = getimagesize($files["tmp_name"][$i]);
$sourceWidth = $dimensions[0];
$sourceHeight = $dimensions[1];
$ratio = $sourceWidth / $sourceHeight; // width/height
//final image should be 600x360
if ($ratio > 1) {
$ratioFactor = $sourceWidth / $targetWidth;
$targetHeight = $sourceHeight / $ratioFactor;
$dstY = (360 - $targetHeight) / 2;
} else {
$ratioFactor = $sourceHeight / $targetHeight;
$targetWidth = $sourceWidth / $ratioFactor;
$dstX = (600 - $targetWidth) / 2;
}
$source = imagecreatefromstring(file_get_contents($files["tmp_name"][$i]));
$target = imagecreatetruecolor($targetWidth, $targetHeight);
imagecopyresampled($target, $source, 0, 0, 0, 0, $targetWidth, $targetHeight, $sourceWidth, $sourceHeight);
imagecopymerge($bgImage, $target, $dstX, $dstY, 0, 0, imagesx($target), imagesy($target), 100);
imagepng($bgImage, $dir . $filename);
php resize image on or before upload
Try this code this may help you
in this variable $resizeObj = new resize('sample.png'); you need to link your uploaded picture url
Imagerezise.php
<?php
// *** Include the class
include("resize-class.php");
// *** 1) Initialise / load image
$resizeObj = new resize('sample.png');
// *** 2) Resize image (options: exact, portrait, landscape, auto, crop)
$resizeObj -> resizeImage(200, 200, 'crop');
// *** 3) Save image
$resizeObj -> saveImage('sample-resizeda.jpg', 1000);
?>
resize-class.php
<?php
# ========================================================================#
# Requires : Requires PHP5, GD library.
# Usage Example:
# include("resize_class.php");
# $resizeObj = new resize('images/cars/large/input.jpg');
# $resizeObj -> resizeImage(150, 100, 0);
# $resizeObj -> saveImage('images/cars/large/output.jpg', 100);
# ========================================================================#
class resize
{
// *** Class variables
private $image;
private $width;
private $height;
private $imageResized;
function __construct($fileName)
{
// *** Open up the file
$this->image = $this->openImage($fileName);
// *** Get width and height
$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
}
## --------------------------------------------------------
private function openImage($file)
{
// *** Get extension
$extension = strtolower(strrchr($file, '.'));
switch($extension)
{
case '.jpg':
case '.jpeg':
$img = @imagecreatefromjpeg($file);
break;
case '.gif':
$img = @imagecreatefromgif($file);
break;
case '.png':
$img = @imagecreatefrompng($file);
break;
default:
$img = false;
break;
}
return $img;
}
## --------------------------------------------------------
public function resizeImage($newWidth, $newHeight, $option="auto")
{
// *** Get optimal width and height - based on $option
$optionArray = $this->getDimensions($newWidth, $newHeight, $option);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
// *** Resample - create image canvas of x, y size
$this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);
// *** if option is 'crop', then crop too
if ($option == 'crop') {
$this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
}
}
## --------------------------------------------------------
private function getDimensions($newWidth, $newHeight, $option)
{
switch ($option)
{
case 'exact':
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
break;
case 'portrait':
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
break;
case 'landscape':
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
break;
case 'auto':
$optionArray = $this->getSizeByAuto($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
case 'crop':
$optionArray = $this->getOptimalCrop($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function getSizeByFixedHeight($newHeight)
{
$ratio = $this->width / $this->height;
$newWidth = $newHeight * $ratio;
return $newWidth;
}
private function getSizeByFixedWidth($newWidth)
{
$ratio = $this->height / $this->width;
$newHeight = $newWidth * $ratio;
return $newHeight;
}
private function getSizeByAuto($newWidth, $newHeight)
{
if ($this->height < $this->width)
// *** Image to be resized is wider (landscape)
{
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
}
elseif ($this->height > $this->width)
// *** Image to be resized is taller (portrait)
{
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
}
else
// *** Image to be resizerd is a square
{
if ($newHeight < $newWidth) {
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
} else if ($newHeight > $newWidth) {
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
} else {
// *** Sqaure being resized to a square
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
}
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function getOptimalCrop($newWidth, $newHeight)
{
$heightRatio = $this->height / $newHeight;
$widthRatio = $this->width / $newWidth;
if ($heightRatio < $widthRatio) {
$optimalRatio = $heightRatio;
} else {
$optimalRatio = $widthRatio;
}
$optimalHeight = $this->height / $optimalRatio;
$optimalWidth = $this->width / $optimalRatio;
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
{
// *** Find center - this will be used for the crop
$cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
$cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );
$crop = $this->imageResized;
//imagedestroy($this->imageResized);
// *** Now crop from center to exact requested size
$this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
}
## --------------------------------------------------------
public function saveImage($savePath, $imageQuality="100")
{
// *** Get extension
$extension = strrchr($savePath, '.');
$extension = strtolower($extension);
switch($extension)
{
case '.jpg':
case '.jpeg':
if (imagetypes() & IMG_JPG) {
imagejpeg($this->imageResized, $savePath, $imageQuality);
}
break;
case '.gif':
if (imagetypes() & IMG_GIF) {
imagegif($this->imageResized, $savePath);
}
break;
case '.png':
// *** Scale quality from 0-100 to 0-9
$scaleQuality = round(($imageQuality/100) * 9);
// *** Invert quality setting as 0 is best, not 9
$invertScaleQuality = 9 - $scaleQuality;
if (imagetypes() & IMG_PNG) {
imagepng($this->imageResized, $savePath, $invertScaleQuality);
}
break;
// ... etc
default:
// *** No extension - No save.
break;
}
imagedestroy($this->imageResized);
}
## --------------------------------------------------------
}
?>
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