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A deblocking JPEG decoder
jpeg  c++  codec  via:hackernews 
yesterday by Z303
google/knusperli: A deblocking JPEG decoder
GitHub is where people build software. More than 27 million people use GitHub to discover, fork, and contribute to over 80 million projects.
jpeg  c++  decoding 
2 days ago by geetarista
Taking A Look At The State Of Progressive Images And User Perception — Smashing Magazine
We all want to load images fast on the web. Choosing the right image format, optimizing the quality and using responsive images are important tasks, but what can we do beyond that?
image  performance  progressive  webdesign  development  jpeg 
22 days ago by vloux
Converting a JPEG to the new HEIF image format
Note: This tutorial assumes you have macOS, Homebrew, Git, cmake, and about 5 minutes to spare. Just want a HEIF image? Download a sample.
Step 1: Install x265
brew install x265
Step 2: Download FFMPEG and build it with the --enable-x265 extension
brew uninstall ffmpeg
brew install ffmpeg --with-x265
Step 3: Download and build the HEIF Sample Implementation
git clone
cd heif
cmake .
make install
Step 4: Use FFMPEG to convert a JPEG to a HVEC bytestream
IMPORTANT: You must use an image with even width and height values (eg: 2042 not 2041) at the moment. The reference implementation will not display images with odd sizes.

`crf` is the quality level. Lower is higher quality.
`pix_fmt` must be yuv420p - the sample HEIF implementation doesn't seem to like other pixel formats, though the format officially supports them.
ffmpeg -i ./your-image.jpg -crf 12 -preset slower -pix_fmt yuv420p \
-f hevc bitstream.265

ffmpeg -i ./your-image.jpg -vf scale=320:240 -crf 28 -preset slower \
-pix_fmt yuv420p -f hevc bitstream.thumb.265
ffmpeg  HVEC  jpeg 
24 days ago by euler
GitHub - danielgtaylor/jpeg-archive: Utilities for archiving JPEGs for long term storage.
Utilities for archiving photos for saving to long term storage or serving over the web. The goals are:

Use a common, well supported format (JPEG)
Minimize storage space and cost
Identify duplicates / similar photos
photo  compression  jpeg  archive  backup 
4 weeks ago by euler
New Tool: | Didier Stevens is a tool I developed to analyze JPEG images. I have used it for a couple of ISC diary entries: Analyzing JPEG files, It is a resume – Part 3 and A strange JPEG file.

This tool reads binary files and parses the JPEG markers inside them:

It can help with corrupted images, here is an example of a JPEG file that was partially overwritten by ransomware:
malware  jpeg  recovery 
7 weeks ago by unclespeedo
TinyPNG – Compress PNG images while preserving transparency
TinyPNG uses smart lossy compression techniques to reduce the file size of your PNG files. By selectively decreasing the number of colors in the image, fewer bytes are required to store the data. The effect is nearly invisible but it makes a very large difference in file size!  PNG  JPEG 
10 weeks ago by GameGamer43

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