Thursday, November 9, 2006
PNG Format Shows Superb Lossless Compression
Posted by Suhit Gupta in "NEWS" @ 07:00 AM
"Blogger David Naylor managed to get himself dugg for posting this cool 24-bit bitmap that shows every single color in the 24 bit spectrum. The file is 4094 by 4096 pixels which works out to precisely 16,777,216 pixels which happens to be 2 to the 24 bit power. What's interesting is that such a file takes 48 MBs to store in an uncompressed format yet the PNG compressed file took a mere 58 kilobytes which means PNG compression achieved a 847.5 to 1 LOSSLESS compression ratio! The same file in a minimum-loss JPEG compressed file took 3.84 MBs and this is NOT a lossless format. The moral of the story is that people need to be more aware of the PNG format and stop using JPEG for everything."
While I post mostly JPG images here on DMT (according to the article - JPEG is more appropriate for Internet distribution of medium and large sized photos of nature or people where you need a good compression ratio with an acceptable loss in image quality), I have started storing personal images in both PNG and JPG formats when converting from RAW. Do you use the PNG file format?
While I post mostly JPG images here on DMT (according to the article - JPEG is more appropriate for Internet distribution of medium and large sized photos of nature or people where you need a good compression ratio with an acceptable loss in image quality), I have started storing personal images in both PNG and JPG formats when converting from RAW. Do you use the PNG file format?
