compression

What is an HEIC File? Everything You Need to Know

An HEIC is a type of image file that contains compressed data, along with metadata such as the location a photograph was taken, the date it was created, and more. While it does reduce picture information, it typically results in a better representation of the original source than an image saved in JPEG format.

What is a JPEG? Everything You Need to Know

JPEG is, by far, the most popular image format for digital photographs and images in the world. An overwhelming majority of photos are stored and shared in this format, typically with a .jpg or .jpeg file extension, because it was a necessity of the early internet to keep file sizes smaller to enable faster transfer speeds.

Android 12 Will Support AVIF Photos

The first preview of Android 12 has landed, and it brings news that the mobile operating system will have platform support for the AV1 Image File Format (AVIF), which has dramatically better image quality for the same file size when compared with image formats such as JPEG.

H.266 Codec Unveiled: Same Quality, Half the File Size

Fraunhofer HHI, the company behind the H.264 and H.265 video codecs, has just unveiled its latest creation: the aptly-named H.266. Just as the world has finally gotten around to adopting HEVC/H.265, we get a newer version that will offer the same quality at about half the file size.

A Cautionary Example of Lens Compression

Somehow or other lens compression effects seem to have hit the zeitgeist. A day does not go by when I fail to see some news photograph critiqued on the grounds of lens compression. Either what it appears to show is fake (or allegedly fake) due to lens compression, or lens compression is concealing some truth. So here's a little description of it, and a cautionary example.

Is Lens Compression Fact or Fiction?

Photography can be confusing. I get it. I am not the sharpest knife in the drawer. Because of this, at times it helps us to actually put some of these theories and myths to the test. One of these myths is the concept of compression and, with it, parallax.

How to Optimize Photos For Facebook

Saving images for the web, and specifically Facebook, can require a little bit of extra attention to get them looking sharp. This 10 minute video from Francisco Hernandez of FJH Photography explores some sharpening, sizing, and exporting tips to ensure your images look their best on Facebook.

Why Zooming with Your Feet is NOT the Same as Zooming with a Lens

You've probably heard it a million times: "zoom with your feet!" This advice comes up almost any time the prime vs zoom lens debate resurfaces, but as anyone with even basic lens knowledge will tell you, zooming with your feet is NOT the same as zooming with your lens.

What Happens When You Re-Save an Image 500 Times in Different Formats

Re-saving an image over and over and over again in a lossy format (a format like JPEG that tosses some data each time you save/compress the file) slowly but surely degrades the image. This is called generation loss, and it's demonstrated beautifully in these almost painful-to-watch YouTube videos.

This Dramatic Shot Was Done with a 2000mm Lens

Here's a neat example of an ultra-telephoto lens being used to add a dramatic effect to a scene. For this scene from the 2011 film Tinker Tailor Soldier Spy, director of photography Hoyte van Hoytema used a 2000mm lens to compress the foreground and background so that they look much closer than they really are.

Here’s How Flickr’s Image Compression Has Changed Since Early 2014

Back in June, we reported that some Flickr users had taken to the service's forums to complain about increasing compression hurting the image quality of their photos. We did some tests of our own and found that there was indeed significant file size and image quality differences -- at least compared to photos uploaded back in 2012.

Well, Flickr heard the grumbling of photographers and made adjustments to its image compression. Backend engineer Archie Russell has also published an article on the company's code blog that explains the whole story.

JPEG 2000: The Better Alternative to JPEG That Never Made it Big

At the turn of the century, the Joint Photographic Experts Group created what they considered to be the next generation of JPEG image compression. Suitably named JPEG 2000, the standard promised better compression performance with improved image quality. However, despite the standard being released fifteen years ago, why do most photographers only glance over the option when saving in Photoshop? Today, we explore the advantages and disadvantages of a file format that already seems to have become a footnote in history.

JPEG Compression Test: Google Photos vs. JPEGmini

In this article I will take a look at Google Photos' new photo compression performance. I've been using a program called JPEGmini for a couple years now to compress my JPEG images. Its compression of JPEGs is lossy, but it claims to do so leaving the perceptual image quality virtually unchanged. As far as I can tell, its claims are pretty accurate, and it has literally helped me cut the size of some of my picture folders in half.

How JPEG Handles Colors and Compression

Want to understand the math and science behind how JPEG files store your digital photographs? The YouTube channel Computerphile has a new series of videos on the JPEG. They're a bit long and heady, but you may find them interesting if you've ever wondered about the technical details behind one of the world's most popular image compression methods.

JPEG Voodoo: Or, Does JPEG File Size Matter?

Would you say the above photograph has any compression artifacts? Compressed too much, not enough, or just right? What exactly is “just right” anyway. This post will explore the concept of compression, why and how do we do it, and how aggressive we should be in either reducing the file size or increasing the image quality.

BPG is a New Image Format That Wants to Replace the JPEG with Equal Quality at Half the Size

JPEG is a remarkably resilient file format. Despite having many upstart formats attempt to dethrone it over the years -- including JPEG 2000 and Google's WebP -- the JPEG is still used by nearly 70% of websites and is holding strong in popularity.

Now there's a new competitor in the ring. It's called BPG (Better Portable Graphics), and it's a format designed and advocated by notable French programmer Fabrice Bellard (creator of FFmpeg and QEMU).

Weird Tip: Wear Compression Socks to Avoid Leg Fatigue on Long, On-Location Shoots

If you've ever been on-location for a shoot from sunrise to sunset (and beyond), you know how fatigued your legs can get by the end of the day. Standing up all day can make it feel like your legs are about to fall off.

But if a comfortable pair of shoes aren't quite enough to keep you going, this weird tip might just be the best gift you can give your legs the next time you've got to be on your feet for extended periods of time.

Using Romeo and Juliet to Illustrate the Pitfalls of JPEG Compression

It's common knowledge that JPEG compression leads to a loss of data, but it's difficult to really visualize the extent of that loss in a photo. A keen eye will be able to tell a difference, but it's still hard to quantify it.

Tom Scott wanted to bring the reality home to those who don't already understand it. So he took the pitfalls of JPEG compression and transferred them from the world of photos, to the world of Shakespeare.

JPEGmini Now Available for Mac: Put Your iPhoto Library on a Diet

Back in August we featured a service called JPEGmini, which gives anybody the ability to shrink their photos up to 5-times in size without any visible quality difference -- a substantial claim, but one that the service seemed to live up to quite well (we use it regularly).

A Higher Quality Setting in Photoshop Sometimes Reduces JPEG Quality

While looking into the new compression service JPEGmini yesterday, the following statement caught my eye in an interview they did with Megapixel:

[...] sometimes you increase the quality setting in Photoshop and the actual quality of the image is reduced...

I had never heard of that before, so I decided to dig a little deeper.

JPEGmini Magically Makes Your JPEGs Up to 5x Smaller

JPEGmini is a new image compression service that can magically reduce the file size of your JPEG photos by up to 5 times without any visible loss in quality. ICVT, the Israeli company behind the service, explains how the technology works in an interview with Megapixel:

Our technology analyzes each specific photo, and determines the maximum amount of compression that can be applied to the photo without creating any visual artifacts. In this way, the system compresses each photo to the maximum extent possible without hurting the perceived quality of the photo.

You can test out the technology on your own photos through the service's website.

Google Wants to Speed Up the Web by Killing the JPEG

Google unveiled a new image format today called WebP that it hopes will make the web faster by cutting files sizes of images without affecting quality. According to a blog post they published earlier today, photos and images account for 65% of the bytes transmitted by websites. In their tests done using 1 million randomly selected images from the web, re-encoding images as WebP resulted in an average file size reduction of 39%. Here's a gallery with image and file size comparisons.

Saving JPEG Photos Hundreds of Times

Most of you probably know that JPEG is lossy compression method, meaning compression permanently throws out data and detail. Luckily, a typical compression can save 10 times the space of an uncompressed image without sacrificing much noticeable quality. However, if the image is repeatedly compressed and saved, artifacts introduced during compression become more and more obvious.