If you’re trying to protect your privacy and avoiding metadata analysis, you want to strip the EXIF data. There’s nothing identifying in the block I copied, but there can be location coordinates and similar further in, as well as camera information which can be somewhat identifying when put together. It’s also great for bulk image processing if you know how to script. It can convert images to different formats, resize, transform, and identify information about images. Imagemagick is a command line tool which is extremely powerful for image manipulation and provides libraries for many different languages for embedded image processing in applications. This article just covers how to view the data and how to get rid of it and some alternatives. The instructions for installing are specific to Debian and Ubuntu, but the same packages most likely exist on your flavor of choice, but might be called something else.
Let’s learn how to both view this data and remove it on Debian and Ubuntu Linux. This is great for you, but not so great from a privacy perspective if you aren’t careful. It’s basically a way to embed camera settings, location data, etc. Searching for this using Google didn't give me any results, so hopefully the above will be helpful to others running into the same problem.EXIF data is great for knowing more about an image, but it can also leak information you don’t want to leak if the picture gets out there. This requires a bit of work, but there is a good example transferIptcExif2File() function in the user contributed notes for the PHP iptcembed() function. However, that still leaves an image with no EXIF data.Ī better way to do that is by copying all the EXIF data from the original image to the resized image. One way to solve this is to read the EXIF data using exif_read_data() and then rotate the image accordingly using the imagerotate() function as explained here. The reason for that is that phone cameras store the camera's rotation in the EXIF data, and the PHP image manipulation functions strip away the EXIF data.
However, using the provided example script the result was that a photo that I took with my iPhone showed up rotated. The first photo I uploaded directly from my iPhone 3G, showing part of the scriptĪctually resizing images is easy enough in PHP using the imagecopyresampled() function. But that gets old, so time for some automation. So in practice I would edit the photos on my computer before posting them. However, iPhone photos are now 3 MB or larger, which is a bit much. When I got my first iPhone back in 2008, I hacked together a quick script that let me post photos from my iPhone to my website. Resizing photos in PHP with correct orientation/rotation and retaining EXIF data (posted )
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