Convert Images with PHP without using ImageMagick

Question

I need to convert a .JPG, .JPEG, .JPE, .GIF, etc to a .PNG from my PHP webpage without using ImageMagick. Any ideas?

Here is the code I found and am trying to work with:

<?php
header("content-type: image/png");
$original_filename = $_HTTP_POST_FILES['uploaded_file']; 
imagepng($original_filename,'border/testconvert.png',9);

?>

I've been looking through the GD documentation, but couldn't figure it out. I've tried some examples I found online, I'll edit my original post and append the code. — Zac Brown, Oct 17 '10 at 20:09
Already a question about this : http://stackoverflow.com/questions/22259/how-do-i-resize-and-convert-an-uploaded-image-to-a-png-using-gd — malletjo, Oct 17 '10 at 20:16
You can't just take a file *path* and make it into a PNG image. String != Image — animuson, Oct 17 '10 at 20:16

richsage · Accepted Answer · 2010-10-17T20:19:21.777

2

Who needs ImageMagick? Take a look at the built-in image functions using gd.

EDIT Basic example:

<?php
 $filename = "myfolder/test.jpg";
 $jpg = @imagecreatefromjpeg($filename);
 if ($jpg)
 {
   header("Content-type: image/png");
   imagepng($jpg);
   imagedestroy($jpg);
   exit;
 }

 // JPEG couldn't be loaded, maybe show a default image
?>

You can do more with this such as change compression and quality values etc, save the output to a file instead of outputting to the browser and so on - check the docs for further info :-)

Note that the image functions issue warnings/notices etc if there are problems loading an image, hence the use of the @ symbol to suppress, otherwise you'll get spurious output instead of just the image data.

edited Oct 17 '10 at 20:19

answered Oct 17 '10 at 20:07

richsage

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gd is not always available either. You need to compile PHP with `--with-gd`. – Matthew Flaschen Oct 17 '10 at 20:11
I can use GD, I've used it with other image manipulation tasks I had. I just can't figure out how to convert the images. – Zac Brown Oct 17 '10 at 20:12
And if you're allowing multiple file types, you'll have to setup a check to see what the extension is and run a switch to load the image based on its file type or just load a default image if it doesn't match anything. – animuson Oct 17 '10 at 20:23
This will do just fine! Thanks! – Zac Brown Oct 17 '10 at 20:25
Re the @ -- it would be much better to turn errors off for the page altogether (`error_reporting(0);`). Suppressing individual errors dramatically slows performance, even when no errors occur. – lonesomeday Oct 17 '10 at 20:34
OK, your example works perfectly. But, I can't seem to find anything about converting .BMP to .PNG... any ideas? – Zac Brown Oct 17 '10 at 23:35
Who needs imagemagick? Anyone that wants a very simple solution to otherwise bulky image handling. Yeah you don't NEED it, but it is a very useful tool for so many reasons. It improved the productivity of our firm substantially with easy to understand, single line conversions. – Kai Qing Oct 19 '10 at 19:26
@Kai I don't doubt it - it is a useful tool. The OP asked for a solution that didn't use it however :-) – richsage Oct 19 '10 at 20:15
@richsage: I am trying to covert from webp to jpg.Followed your snippet,but I am getting yellow background in the converted pic.What could be the reason.Pls assist.. – Basher51 Nov 20 '14 at 03:29

score 0 · Answer 2 · answered Oct 17 '10 at 20:24

0

function jpg2png($originalFile, $outputFile, $quality) {
    $image = imagecreatefromjpeg($originalFile);
    imagepng($image, $outputFile, $quality);
    imagedestroy($image);
}

Try something like this.

Tell me if if works!!

Good luck

answered Oct 17 '10 at 20:24

Trufa

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It was the same logic (ish) used in the first example, and yes.. it works great! But, would you happen to know about converting .BMP to .PNG? – Zac Brown Oct 17 '10 at 23:37
No but you should really start a question on that particular topic because might be really interesting. Good luck! – Trufa Oct 18 '10 at 00:22

Convert Images with PHP without using ImageMagick

2 Answers2