Comments on: PNG vs JPEG http://www.johndcook.com/blog/2009/01/08/png-vs-jpeg/ The blog of John D. Cook Sat, 11 Feb 2012 01:10:06 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: Anon http://www.johndcook.com/blog/2009/01/08/png-vs-jpeg/comment-page-1/#comment-37792 Anon Wed, 05 May 2010 15:34:15 +0000 http://www.johndcook.com/blog/?p=1227#comment-37792 For those looking for more information, download the source for libjpeg and read the notes. For those looking for more information, download the source for libjpeg and read the notes.

]]> By: Mike http://www.johndcook.com/blog/2009/01/08/png-vs-jpeg/comment-page-1/#comment-30813 Mike Fri, 15 Jan 2010 06:26:11 +0000 http://www.johndcook.com/blog/?p=1227#comment-30813 More specifically, I believe that JPEG uses the discrete cosine transform, which is similar to but different from just using a discrete Fourier transform. Also, JPEG-2000 uses the wavelet transform, which is fundamentally different than a Fourier-related technique. More specifically, I believe that JPEG uses the discrete cosine transform, which is similar to but different from just using a discrete Fourier transform.

Also, JPEG-2000 uses the wavelet transform, which is fundamentally different than a Fourier-related technique.

]]> By: Noah http://www.johndcook.com/blog/2009/01/08/png-vs-jpeg/comment-page-1/#comment-19780 Noah Tue, 23 Jun 2009 21:16:07 +0000 http://www.johndcook.com/blog/?p=1227#comment-19780 I understand what you are saying but you are not comparing apples to apples here and I think that can be a little misleading. You can still use JPG and have good looking quality images by not turning the compression up so high: <a href="http://solidfull.com/demo/jpg_vs_PNG2.jpg" rel="nofollow">See this example JPG file</a> In this case, the stick figure image file is actually smaller using PNG but in certain cases such as photos the JPG file will actually be smaller. I respect the PNG file's ability to do transparency in most browsers but still thing JPG files have their place. For example, I noticed your photo of the ship Endeavour is a JPG file instead of a PNG file. I understand what you are saying but you are not comparing apples to apples here and I think that can be a little misleading.

You can still use JPG and have good looking quality images by not turning the compression up so high: See this example JPG file

In this case, the stick figure image file is actually smaller using PNG but in certain cases such as photos the JPG file will actually be smaller. I respect the PNG file’s ability to do transparency in most browsers but still thing JPG files have their place. For example, I noticed your photo of the ship Endeavour is a JPG file instead of a PNG file.

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