How can I convert all images to jpg? - php

Question

I have script:
<?php
include('db.php');
session_start();
$session_id = '1'; // User session id
$path = "uploads/";
$valid_formats = array("jpg", "png", "gif", "bmp", "jpeg");
if (isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST") {
$name = $_FILES['photoimg']['name'];
$size = $_FILES['photoimg']['size'];
if (strlen($name)) {
list($txt, $ext) = explode(".", $name);
if (in_array($ext, $valid_formats)) {
if ($size < (1024 * 1024)) { // Image size max 1 MB
$actual_image_name = time() . $session_id . "." . $ext;
$tmp = $_FILES['photoimg']['tmp_name'];
if (move_uploaded_file($tmp, $path . $actual_image_name)) {
mysql_query("UPDATE users SET profile_image='$actual_image_name' WHERE uid='$session_id'");
echo "<img src='uploads/" . $actual_image_name . "' class='preview'>";
} else {
echo "failed";
}
} else {
echo "Image file size max 1 MB";
}
} else {
echo "Invalid file format..";
}
} else {
echo "Please select image..!";
}
exit;
}
?>
Is possible convert all images (png, gif etc) to jpg with 100% quality? If yes, how? I would like allow to upload png and gif, but this script should convert this files to jpg. Is possible this with PHP?

Answer 1

Try this code: originalImage is the path of... the original image... outputImage is self explaining enough. Quality is a number from 0 to 100 setting the output jpg quality (0 - worst, 100 - best)
function convertImage($originalImage, $outputImage, $quality)
{
// jpg, png, gif or bmp?
$exploded = explode('.',$originalImage);
$ext = $exploded[count($exploded) - 1];
if (preg_match('/jpg|jpeg/i',$ext))
$imageTmp=imagecreatefromjpeg($originalImage);
else if (preg_match('/png/i',$ext))
$imageTmp=imagecreatefrompng($originalImage);
else if (preg_match('/gif/i',$ext))
$imageTmp=imagecreatefromgif($originalImage);
else if (preg_match('/bmp/i',$ext))
$imageTmp=imagecreatefrombmp($originalImage);
else
return 0;
// quality is a value from 0 (worst) to 100 (best)
imagejpeg($imageTmp, $outputImage, $quality);
imagedestroy($imageTmp);
return 1;
}

Answer 2

Try using Imagick setImageFormat, for me it provides the best image quality
http://php.net/manual/en/imagick.setimageformat.php
$im = new imagick($image);
// convert to png
$im->setImageFormat('png');
//write image on server
$im->writeImage($image .".png");
$im->clear();
$im->destroy();

Answer 3

Davide Berra's answer is great, so I improved the file type detection a little, using exif_imagetype() instead of relying on the file extension:
/**
* Auxiliar function to convert images to JPG
*/
function convertImage($originalImage, $outputImage, $quality) {
switch (exif_imagetype($originalImage)) {
case IMAGETYPE_PNG:
$imageTmp=imagecreatefrompng($originalImage);
break;
case IMAGETYPE_JPEG:
$imageTmp=imagecreatefromjpeg($originalImage);
break;
case IMAGETYPE_GIF:
$imageTmp=imagecreatefromgif($originalImage);
break;
case IMAGETYPE_BMP:
$imageTmp=imagecreatefrombmp($originalImage);
break;
// Defaults to JPG
default:
$imageTmp=imagecreatefromjpeg($originalImage);
break;
}
// quality is a value from 0 (worst) to 100 (best)
imagejpeg($imageTmp, $outputImage, $quality);
imagedestroy($imageTmp);
return 1;
}
You must have php_exif extension enabled to use this.

Answer 4

A small code to convert image.png to image.jpg at desired image quality:
<?php
$image = imagecreatefrompng('image.png');
imagejpeg($image, 'image.jpg', 70); // 0 = worst / smaller file, 100 = better / bigger file
imagedestroy($image);
?>

Answer 5

a small fix to davide's answer, the correct function for converting from BMP is "imagecreatefromwbmp" instead of imagecreatefrombmp (missing "w")
also you should consider that png may be transparent, here is a way to fill it with white BG (jpeg can't apply alpha data).
function convertImage($originalImage, $outputImage, $quality){
// jpg, png, gif or bmp?
$exploded = explode('.',$originalImage);
$ext = $exploded[count($exploded) - 1];
if (preg_match('/jpg|jpeg/i',$ext)){$imageTmp=imagecreatefromjpeg($originalImage);}
else if (preg_match('/png/i',$ext)){$imageTmp=imagecreatefrompng($originalImage);}
else if (preg_match('/gif/i',$ext)){$imageTmp=imagecreatefromgif($originalImage);}
else if (preg_match('/bmp/i',$ext)){$imageTmp=imagecreatefromwbmp($originalImage);}
else { return false;}
// quality is a value from 0 (worst) to 100 (best)
imagejpeg($imageTmp, $outputImage, $quality);
imagedestroy($imageTmp);
return true;
}

Answer 6

From PhpTools:
/**
* #param string $source (accepted jpg, gif & png filenames)
* #param string $destination
* #param int $quality [0-100]
* #throws \Exception
*/
public function convertToJpeg($source, $destination, $quality = 100) {
if ($quality < 0 || $quality > 100) {
throw new \Exception("Param 'quality' out of range.");
}
if (!file_exists($source)) {
throw new \Exception("Image file not found.");
}
$ext = pathinfo($source, PATHINFO_EXTENSION);
if (preg_match('/jpg|jpeg/i', $ext)) {
$image = imagecreatefromjpeg($source);
} else if (preg_match('/png/i', $ext)) {
$image = imagecreatefrompng($source);
} else if (preg_match('/gif/i', $ext)) {
$image = imagecreatefromgif($source);
} else {
throw new \Exception("Image isn't recognized.");
}
$result = imagejpeg($image, $destination, $quality);
if (!$result) {
throw new \Exception("Saving to file exception.");
}
imagedestroy($image);
}