Weird Image Formats

Why do these exist? 🤔

▼ Time Stamps: ▼
0:00 - Intro
0:31 - JPG-large & PNG-large
1:07 - JNG
1:32 - JPEG Variations
1:56 - JPEG 2000
3:23 - JPEG XT
4:18 - JPEG XL
5:49 - AVIF
6:54 - Bitmap
7:55 - ICO / CUR
9:14 - DNG
11:52 - SVG

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[kantoros]

I am 90% sure that the '-large' was supposted to be added to the basename of the file, not the extension itself. Some engineer didn't know how to do that or didn't care to fix it, and honestly that's the kind of quality control I expect of Twitter lol

[morxemplum]

So glad you covered JPEG XL. A lot of FOSS programs already support it, and I hope Adobe pushes it out if experimentation because that might be the stepping stone for people to support it.

[Ozymandias]

The reason why a JPEG image file has the extension .jpg is DOS which only allowed for three letter extensions.

[ivirius.parody]

PSD files: *I don't have such weakness*

[N....]

JPEG XL is great because it can recompress existing JPEG images to be smaller, losslessly. Think of all the images out there on the internet that only have a JPEG original source, now they can be made smaller without losing any information.

[FunctionGermany]

i heard that JPEGXL can be used to compress existing JPEG files to it without loss (lossless) but significant file size savings. this could save a lot of internet bandwidth and storage space without loss of quality.

[yuvalne]

my favourite is JXL. it's genuinely so impressively powerful and well-featured, no wonder Google is trying to actively kill it.

[cuttercarlo]

Sidenote: everytime you see a movie in a cinema, everything is encoded in jpeg2000 if it is projected digitally (the files used for that are called a "DCP" and it uses jpg2000 as its standard)

[LeBigMeme]

I'm actually really excited for JXL, as the next generation image format, for it's been nigh 30 years since the current release of JPEG, apparently. I wonder how it compares to PNGs.

[wojtekpolska]

the vector image thing once surprised me a lot, because i found a very old animation in flash, and was surprised how high resolution it was. after zooming in more, i realized the original author made the images in vector :p

[jwolf]

jpeg 2000 is widely used in the cinema space and is typically what digital cinema projectors playback when you go see a movie

[simonbeer]

Most people have looked at JPEG 2000 images without realizing, as it is used in digital cinema. One interesting feature of JPEG 2000 are resolution layers. JPEG 2000 is compressed and stored in such a way, that only a portion needs to be read and decoded to obtain lower resolution versions of the image. Additionally, low file sizes result in a blurry image instead of blocking artifacts like standard JPEG. One problem with JPEG 2000 was that when it was first introduced, it was very demanding on normal hardware to decode and encode.

[beegman]

damn the turnaround from community poll to full video was crazy on this one

[markusTegelane]

Cursors are slightly different from icons in the file header, because they need to store the click point of the cursor (e.g. for the wait cursor, it's in the middle, and the regular arrow cursor is in the top left), so you can't just change the file extension to use it as an icon, you need to modify 1-3 bytes of data with a hex editor or use a file converter.

[Southrop]

With regards to jpg-large, that's a quirk of Windows file name restrictions. The url of the image uses a colon to specify image size, e.g. image.png:small or image.jpg:large. But when you try to save it, windows doesn't let you use colons in file names so Chrome replaces the colon with a hyphen.

[CarlTheNPC]

"it's pronounced gif not gif"
my brain:

[gamethecupdog]

JPEG XL is actually really sick, on top of being an extension of JPEG, you can losslessly reencode a JPEG image to and from XL, and the XL reencode saves extra space without any change or loss to the image

[charginginprogresss]

SVG is basically how some PDF pictures worked.
I have a PDF map of the whole bus network of my city (that you can download from official sources), and it can expand indefinitely if I zoom in, and you can see it is made of lines if you zoom in enough.

[davidunwin]

Thanks for the "demosaic" info. Its an option that pops up when im stacking raw images for Astrophotography but i never really understood what it was doing.

[Jet-Pack]

I knew the whole gif vs gif debate would rise up again