Visualizing and Understanding JPEG Format
1–10 of 47 posts
Re: Visualizing and Understanding JPEG Format
#2This repo from the author is full of gold. Shows the details and visualization of various file structures (including multiple zip formats, image formats and executable files)
Re: Visualizing and Understanding JPEG Format
#3> lossless storage:
> to make JPEG store data losslessly: use grayscale, 100% quality, then either width or eight to 1 pixel, or duplicate the padded data 8 times (JPEG images are stored in 8x8 blocks).
Interesting. I wonder if this is used internally in any applications.
Re: Visualizing and Understanding JPEG Format
#4> lossless storage: > to make JPEG store data losslessly: use grayscale, 100% quality, then either width or eight to 1 pixel, or duplicate the padded data 8 times (JPEG images are stored in 8x8 blocks). Interesting. I wonder if this is used internally in any applications.
1 - No.
2 - JPEG algorithm allows to have lossless data without padding
3 - For lossless data rar/arc/ace are better then JPEG
Re: Visualizing and Understanding JPEG Format
#5This is great, I was literally banging my head against a wall last night trying to determine how the length of the ECS was determined. What a lucky coincidence!
I'm trying to build a small C# library to support reading image types to learn about them, png was quite understandable but jpg is a little trickier, given I panic when I see maths.
Re: Visualizing and Understanding JPEG Format
#6This repo from the author is full of gold. Shows the details and visualization of various file structures (including multiple zip formats, image formats and executable files) https://github.com/corkami/pics
Checked it out and the name Ange Albertini rang a bell. I fondly remember his Funky File Formats talk from 31C3.
More gold from him here:
https://media.ccc.de/search?p=Ange+Albertini
The Preserve Arcade Games talk is also good, I only realized now that both talks were by the same person.
Re: Visualizing and Understanding JPEG Format
#7why i still see jpeg in 2020 ?
Re: Visualizing and Understanding JPEG Format
#8why i still see jpeg in 2020 ?
What's wrong with JPEG?
Re: Visualizing and Understanding JPEG Format
#9Very nice read, thanks for posting it!!!
I also learned a lot from the various JPEG articles on ImpulseAdventure (no affiliation), e.g.:
https://www.impulseadventure.com/photo/jpeg-quantization.htm...
https://www.impulseadventure.com/photo/jpeg-compression.html
https://www.impulseadventure.com/photo/chroma-subsampling.ht...
They also have a lot of practical stuff (which chroma subsampling will Photoshop actually use when you save at 80% quality?) in addition to the theory.
Re: Visualizing and Understanding JPEG Format
#10If I'm being honest, I'm more of a PNG fan.