How to Convert All Images to Jpg Format in PHP

How can I convert all images to jpg?

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;
}

How to convert all images to JPG format in PHP?

Maybe it's not working with PNG because PNG only supports compression levels 0 to 9.

I'd also rather modify the behaviour based on MIME type, not extension. And I guess you're checking your POST user input before using it in code ;)

Here's my variant of the code:

$path = "../images/DVDs/";

$img = $path . $_POST['logo_file'];

if (($img_info = getimagesize($img)) === FALSE)
  die("Image not found or not an image");

switch ($img_info[2]) {
  case IMAGETYPE_GIF  : $src = imagecreatefromgif($img);  break;
  case IMAGETYPE_JPEG : $src = imagecreatefromjpeg($img); break;
  case IMAGETYPE_PNG  : $src = imagecreatefrompng($img);  break;
  default : die("Unknown filetype");
}

$tmp = imagecreatetruecolor(350, 494);
imagecopyresampled($tmp, $src, 0, 0, intval($_POST['x']), intval($_POST['y']),
                   350, 494, intval($_POST['w']), intval($_POST['h']));

$thumb = $path . pathinfo($img, PATHINFO_FILENAME) . "_thumb";
switch ($img_info[2]) {
  case IMAGETYPE_GIF  : imagegif($tmp,  $thumb . '.gif');      break;
  case IMAGETYPE_JPEG : imagejpeg($tmp, $thumb . '.jpg', 100); break;
  case IMAGETYPE_PNG  : imagepng($tmp,  $thumb . '.png', 9);   break;
  default : die("Unknown filetype");
}

For every filetype you want supported, you only have to add two lines of code.

How can I convert uploaded images to JPG format

Try this:

<?php

$path = "uploads/";

$img = $_FILES['photoimg']['tmp_name'];
$dst = $path . $_FILES['photoimg']['name'];

if (($img_info = getimagesize($img)) === FALSE)
  die("Image not found or not an image");

$width = $img_info[0];
$height = $img_info[1];

switch ($img_info[2]) {
  case IMAGETYPE_GIF  : $src = imagecreatefromgif($img);  break;
  case IMAGETYPE_JPEG : $src = imagecreatefromjpeg($img); break;
  case IMAGETYPE_PNG  : $src = imagecreatefrompng($img);  break;
  default : die("Unknown filetype");
}

$tmp = imagecreatetruecolor($width, $height);
imagecopyresampled($tmp, $src, 0, 0, 0, 0, $width, $height, $width, $height);
imagejpeg($tmp, $dst.".jpg");

?>

Converting Image Files to JPEG

In PHP you start off by reading the content of the uploaded files into imagecreatefromstring() with something like file_get_content($filePath). From there you use one imagejpeg to write to another file with extension .jpg

Here is a sample:

$handle = imagecreatefromstring(file_get_content($filePath));
imagejpeg($handle,'newfile.jpg',100);

Reference

1. imagejpeg
2. imagecreatefromstring
3. file_get_content

PHP - convert all images to jpg using Imagick - bad quality

The image is not in "bad quality" (there is no blurry areas found), but the difference between 2 images is caused by transparent PNG to JPG conversion.

Before you crop the image, add these two lines:

// set background to white (Imagick doesn't know how to deal with transparent background if you don't instruct it)
$img->setImageBackgroundColor(new ImagickPixel('white'));

// flattens multiple layers
$img = $img->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);

laravel and image intervention, how to convert all images to jpeg and save from Input::file?

I think you need to call encode() before you call save() as save actually saves the image to disk.

$jpg = (string) Image::make('public/foo.png')->encode('jpg', 75);

Documentation: http://image.intervention.io/api/encode

How to write a PHP file converter?

You can get the data from a file, in this case an image by using file_get_contents:

$data = file_get_contents("img.png");

Once you have the data to form the new file, you can then use the function file_put_contents to write your new file:

if (file_put_contents("img.jpg", $data)) {
    echo("success");
} else {
    echo("failure");
}

file_put_contents returns an int of 0 or 1 so you can determine if it was successful in creating the file.

You could then create the following function:

function imagepng($input, $output) {
    return file_put_contents($output, $input);
}

Hope this is helpful.

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