How can I convert all images to jpg?

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?

Look at this discussion, it was already answered [Use PHP to convert PNG to JPG with compression?][1] [1]: http://stackoverflow.com/questions/1201798/use-php-to-convert-png-to-jpg-with-compression — Davide Berra, Jan 27 '13 at 16:33

Davide Berra · Accepted Answer · 2013-01-28T08:03:21.647

49

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;
}

edited Jan 28 '13 at 08:03

answered Jan 27 '13 at 16:49

Davide Berra

6,387
2
29
50

call this function instead of move_uploaded_file – Davide Berra Jan 28 '13 at 08:03
2

Use $ext == 'png' and like instead of preg_match - it works too and is slightly faster. Also, I use strtolower on $ext before the check, to handle extensions like .JPG correctly. Otherwise, excelent function, helped me a lot. +1 – Pavel V. Jan 29 '15 at 10:36
the /i in preg_match makes the check case insensitive – Davide Berra Jan 29 '15 at 10:38
3

One may assume that passing $_FILES['photoimg']['tmp_name'] as the $originalImage would work, but it happens to save the file as XXXXX.tmp, so the extension didn't worked. Passing $_FILES['photoimg']['name'] instead will give the correct extension, but fail to create the image (it's getting a string instead of an object. So to solve that, you may pass both info, $originalImage and $originalName and edit the function accordingly, other than that, thanks a lot Davide for a great function i've been using for years now – LordNeo Jun 08 '16 at 20:31
i would add $ sign at the end of every reg. pattern. Why? what about uploaded file named: **iAmjpegWithGifAndPngTypedInName.bmp** . Dollar sign will ensure that there is nothing after the extension matched in pattern – Jimmmy Mar 29 '17 at 09:14
what about convert to HEIC? – Mohammad Aghayari Sep 13 '22 at 20:12

score 11 · Answer 2 · edited Jan 27 '13 at 16:38

11

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();

edited Jan 27 '13 at 16:38

Raab

34,778
4
50
65

answered Jan 27 '13 at 16:37

chill0r

1,127
2
10
26

score 8 · Answer 3 · answered Oct 23 '17 at 16:45

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.

With exit_imagetype you can also convert broken images or images that have been converted. Works much better than the answer from Davide. Strage that that got the tick, and not this. — Lukas, Apr 21 '22 at 18:27

score 3 · Answer 4 · edited Aug 11 '16 at 08:28

3

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);
?>

edited Aug 11 '16 at 08:28

Al Foиce ѫ

4,195
12
39
49

answered Aug 11 '16 at 06:45

Ahmad Vaqas Khan

628
8
9

score 1 · Answer 5 · edited May 23 '17 at 12:34

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;
}

score 0 · Answer 6 · answered Apr 26 '17 at 16:43

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);
}

How can I convert all images to jpg?

6 Answers6

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