#lossy compression

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[iwentbacktoartschool]

When I send my final design as a PNG and then see it implemented as a JPEG

[simplificationstationus-blog]

Images  (.PNG .JPEG .GIF  .TIFF .SVG and raw images)

Introduction 

Are you a photography student? Are you doing photography on the side? Do you just want to learn about image formats? Well do i have some good news for you dear reader, this post is going to help.

PNG 

Portable Network  Graphics 

This file format was originally made for sending images over the internet. Oh good ol intenet! PNG's also using lossless compression so this means their file sizes are bigger in comparison to JPEG. The advantage to PNG's is transparency for the background. This means you can insert the image into anything that takes image files and the image will have no background.For example if you had a bench there with a white background for a JPG the white background would be there. But with a PNG the only thing that will be there will be the bench.  

JPEG

Joint Photographic Experts  Group

JPEG's save a lot of storage space due to lossy compression. Some of the pictures data is discarded. This is done by taking every 8x8 block of pixels into 64 standard patterns. The blocks with more checkerboard like pattens have some of the pixels removed therefore less data. This does mean that the images in the jpeg format are less sharp. In turn, around 10% of the data for the orignal image is taken when compressed into the jpeg format.

GIF  Graphical  Interchange  Format

GIFs use something called lossless compression. The GIF format also allows said images to be animated as seen on most social media pages to date (take a peak down at the bottom of the post, that down there is a GIF). So whats the drawback to GIF? Well they're are restricted to 256 colours only. That may sound like a lot but when you look at the common GIF you will notice that it looks grainy when coming to more complex images.

TIF  Tagged  Image Format

Tif does support compression however it also supports uncompressed images as well as many other colour spaces and other options. This makes it popular among photographers and printers.

SVG Scalable Vectors Graphics

This file type allows the resize of images without and quality lost at all! However keep in mind this fact makes file sizes bigger than the averaege common JPEG

Raw image Negative Format

This file type works sort of like old photography film does. The file isnt the image its self but it is the data to make up the image. The only problem with this is this format needs special codex to open on a image editor. However this format opens up the possibility of more editing options.

Thank you for reading this post.

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[aiofocthub]

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[aiofocthub]

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[thaumbody]

Journalism is Lossy Compression. In The New Yorker, Ted Chiang calls……

[tap-tap-tap-im-in]

This is a Computer Science rant.

I was reading a post here about data loss in Lossy-Compressed audio files like MP3, and the author claimed that MP3s lose data over time, whereas Lossless-Compressed formats like FLAC do not.

That’s not true. You will see data loss in MP3s over time, but you’ll see data loss in FLAC files too. But that has little to do with the compression methods used to create the file, and a lot more to do with that fact that you’ve copied the file from location to location over the years, and that hard drives sometimes don’t fail spectacularly, but instead data gets just a little corrupt here or there. All files do this, but digital files are very resilient to this, and it will take decades or some truly bad luck before you’ll notice.

It’s true that Lossy-Compression will lose data over time if the file is decompressed and then recompressed over and over. That’s because Lossy-Compression works to make data smaller by removing some of the data. What data is removed and why depends on what you are compressing and how, but once the data is removed, it’s gone forever and cannot be recovered except by returning to the original.

Knowing that, the premise of the original post makes a little sense. Files have to be decompressed to be played, so you might lose data over time.

But not true. All open files on your computer are copied to RAM before anything is done to them (or portions of files, depending on how big they are and what you’re doing). For MP3s, the copy is then decompressed, also in the RAM. The original file is never decompressed, so it doesn’t need to be recompressed. There is no compression related data loss.

FLAC is a great format, and everyone should prefer lossless formats over lossy ones if they have the option and the space, but your MP3s aren’t going to suddenly sound worse because you play them too much. One of the great benefits of digital formats is that they are infinitely easier to preserve and maintain than physical ones.

Honestly, I think what the post was observing can be isolated down to advances in compression methods in the past few years. An MP3 ripped from disc in 1999 isn’t going to sound like one from 2019, but that’s because we got smarter about things like bit-rates, and now have hardware that’s capable of decoding faster and better.

Anyway, I can’t find the original post, so if you know what it is, please point it out to me so I can reblog the above on it and maybe reverse a little bad information.

I don’t know why I latched onto this bad information in particular, but I did, and thank you for reading my rant.