Use PHP / GD to Save Binary Data as a JPEG Without Losing Metadata

Question

I have an image that is being fed to my PHP script as binary data. I want to save this image as a jpeg to a directory on my server. I can accomplish this with the following code:

// create image resource from the binary data
$image = imagecreatefromstring($binary_data);

// save the image resource as a jpeg
imagejpeg($image, $directory);

The problem is that when I do this, I think it is creating a new image that contains new metadata. Is there a way I can save the binary data as an image and preserve the original binary data?

files are just strings why not just write the string directly — , May 03 '12 at 20:00
When you say meta info, do you mean the created timestamp etc, or the EXIF data? — Jamie Bicknell, May 03 '12 at 20:05

score 0 · Accepted Answer · answered May 03 '12 at 20:00

0

Why don't you just save $binary_data instead of passing it through GD
file_put_contents($directory, $binary_data)

answered May 03 '12 at 20:00

Musa

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score 0 · Answer 2 · answered May 04 '12 at 07:20

With Meta data, you can read the data via iptcparse() and embed it back in via iptcembed()

This comment will pretty much do exactly what you want -> http://us3.php.net/manual/en/function.iptcembed.php#85887

For EXIF data, you can read it via exif-read-data() but there isn't a way of writing that data back to the file, but hopefully that should be enough to get you started in the right direction.

Use PHP / GD to Save Binary Data as a JPEG Without Losing Metadata

2 Answers2