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They found that 38.9% of the images had some metadata, and of those images, metadata accounted for 15.8% of their total file size.

They downloaded all of these images and analyzed the associated metadata.

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Crawling the archive from August 1, 2016, provided 4.3 million images from the top 500,000 websites, totaling 195 GB.

As Dexecure’s research into the impact of metadata on image performance revealed, as much as 16% of the total file size of images online is metadata.īut the thing is, most people don’t even know they’re sharing image metadata-and users generally don’t know they’re downloading it.ĭexecure wanted to find out exactly how much unnecessary metadata is contained in images online, so they used the data from the HTTP Archive along with help from BigQuery to generate a list of URLs of valid JPEG images. There is a lot of image metadata floating around on the web.

But really… who cares? How Image Metadata Impacts Performance It’s pretty cool seeing the location information for my photo displayed as a map, along with the time and date the image was taken. If you’re using Windows or want to view other metadata contained in an image, there are free online tools such as, a free online EXIF data viewer, and, an online photo location viewer that uses EXIF GPS coordinate data to create a map view of your photos. If you’re using OS X, you can simply right-click an image and click “Get Info” to see all kinds of details, such as its creation day, the make and model of the camera it was taken on, its color profile, and exposure.Īlternatively, and also on OS X, you could open the image in Preview and go to Tools > Show Inspector to see more information about the image. There are many different ways to view image metadata.

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While some metadata is generated by manufacturers and devices that capture images, other metadata may be added manually and edited using software like GIMP and Photoshop.Ī lot of information can be contained in metadata-There are more than 460 metadata tags alone for the EXIF format. Image metadata allows information to be transported together with an image, in a way that can be understood by software, hardware, and humans, regardless of the format. Imaging programs like GIMP use ICC color profiles to interpret an image’s RGB values.

ICC (International Color Consortium) – In color management, an ICC profile is a set of data that characterizes a color input or output device, or a color space, according to standards set by the ICC.

8BIM – A file extension used by Photoshop that stores some graphics-related data.

XMP (Extensible Metadata Platform) – An XML-based format recently adopted by Adobe that incorporates all the information from the IPTC format, but allows for additional information to be stored within the image.

The IPTC section of an image usually contains information about the image, such as title, description, keywords, photographer’s information, copyright restrictions, and more.

IPTC (International Press Telecommunications Council) – A format originally adopted by old media news agencies to streamline information, but has been implemented by new media to do much the same thing.

This specification also helps cameras use formats that can be exchanged between devices for example, ensuring an iPhone photo appears correctly on a Samsung device.

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cameras and smartphones), such as data and time, and camera settings (make and model, image orientation, aperture, shutter speed, focal length, metering mode, ISO speed etc).

EXIF (Exchangeable image file format) – Information generated automatically by the device that captured the image (i.e.

In addition to visual data, image files actually contain several different formats for metadata, which in turn store different types of information: Image metadata, specifically, is information embedded into an image that includes details about the image itself as well as information about how it was created.

Metadata is generally described as data about data.

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In this post, we’ll take a look at what image metadata is, its performance impacts, some security concerns you might not be aware of, along with details on how to scrub metadata from your images. But what you might not be doing is trimming excess metadata. When it comes to website optimization, images are often considered low hanging fruit since they’re easy to compress.

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This means 8% of what we download online is useless, unnecessary metadata. But consider this: On average, image metadata makes up 16% of a typical JPEG file on the web, according to website optimization service Dexecure. Images account for a whopping 50% of the total file size of a web page.