Comments on: Image Optimization, Part 4: Progressive JPEG…Hot or Not? http://www.yuiblog.com/blog/2008/12/05/imageopt-4/ The official blog of the YUI Project. Thu, 09 Feb 2012 01:46:52 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: Andrew http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-593681 Andrew Fri, 20 Aug 2010 01:39:57 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-593681 Thanks for this great article. I saw a comment in IRC about using progressive jpegs to save space and improve loads times but wasn't able to query the author of the comment at the time to learn *why. After reading a couple of less than spectacular articles on the subject, I hit yours. Nicely done. I got the why, the when, potential hows, and a scientifically oriented proof of the reasoning. Who could ask for more? :) Thanks for this great article.

I saw a comment in IRC about using progressive jpegs to save space and improve loads times but wasn’t able to query the author of the comment at the time to learn *why. After reading a couple of less than spectacular articles on the subject, I hit yours.

Nicely done. I got the why, the when, potential hows, and a scientifically oriented proof of the reasoning. Who could ask for more? :)

]]> By: Jennifer Farley http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-582452 Jennifer Farley Wed, 08 Jul 2009 21:00:44 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-582452 Hi Stoyan These are an excellent set of articles. They're very thorough and filled with useful info. Thanks Hi Stoyan

These are an excellent set of articles. They’re very thorough and filled with useful info. Thanks

]]> By: Arran Ross-Paterson http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-581743 Arran Ross-Paterson Mon, 08 Jun 2009 10:49:04 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-581743 The Digital Millennium Copyright Act would only apply if you or the organisation you where representing did not hold the copyright of the images that you where publishing, but more importantly the Digital Millennium Copyright Act is only relevant to the minority of the web that is developed in the USA. The Digital Millennium Copyright Act would only apply if you or the organisation you where representing did not hold the copyright of the images that you where publishing, but more importantly the Digital Millennium Copyright Act is only relevant to the minority of the web that is developed in the USA.

]]> By: Jackie Neale Chadwick http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-579243 Jackie Neale Chadwick Fri, 20 Mar 2009 23:51:31 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-579243 Hi, I hate to harp on it again, but boasting that a command line can remove metadata from an image should be retracted as it is against the Digital Millennium Copyright Act. Programmers should either find another command line that keeps the metadata where it should remain (in the photo file), or develop another method for shedding the extra weight elsewhere. Thanks, Jackie Hi,
I hate to harp on it again, but boasting that a command line can remove metadata from an image should be retracted as it is against the Digital Millennium Copyright Act. Programmers should either find another command line that keeps the metadata where it should remain (in the photo file), or develop another method for shedding the extra weight elsewhere.

Thanks,
Jackie

]]> By: Oren http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-578799 Oren Fri, 06 Mar 2009 00:24:09 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-578799 Thanks for this great post! Thanks for this great post!

]]> By: David Paul Ellenwood http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-528346 David Paul Ellenwood Tue, 09 Dec 2008 21:54:28 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-528346 Kick-Butt articles (all four of them)! Thanks for delving into the topic of image optimization and putting some hard numbers to things that I had <em>felt</em> for a long time, but was never able to put concrete evidence to. Kick-Butt articles (all four of them)! Thanks for delving into the topic of image optimization and putting some hard numbers to things that I had felt for a long time, but was never able to put concrete evidence to.

]]> By: Brian H. http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-527698 Brian H. Mon, 08 Dec 2008 00:41:25 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-527698 File size aside, I would defer to Jakob's Law: users spend most of their time on other sites. Most sites use baseline, so users expect baseline. I think the potential benefits of progressive aren't significant or clear enough to warrant violating user expectations. File size aside, I would defer to Jakob’s Law: users spend most of their time on other sites. Most sites use baseline, so users expect baseline. I think the potential benefits of progressive aren’t significant or clear enough to warrant violating user expectations.

]]> By: Kamil T. http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-527311 Kamil T. Fri, 05 Dec 2008 22:12:25 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-527311 Good stuff. Small thing, easy to remember and very useful to know. Thanks. Good stuff. Small thing, easy to remember and very useful to know. Thanks.

]]> By: Robert http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-527287 Robert Fri, 05 Dec 2008 19:11:37 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-527287 Another excellent article! It's great that your actually doing tests and research to get accurate data to determine whether assumptions are correct or not. The work your doing really is valuable. Think about it, these articles will be indexed and for the next 100 years whenever people search for things like 'jpeg progressive comparison' or what not, your article will be near the top if not the top. I certainly think you should do a 'Summary' article at the end where you list out very simple rules as to what image format to choose in what situation. Even better, implement your findings into YSlow. Have it automatically inspect the images being used and suggest alternatives based on that analysis. Once again, nice work :) Another excellent article!

It’s great that your actually doing tests and research to get accurate data to determine whether assumptions are correct or not.

The work your doing really is valuable. Think about it, these articles will be indexed and for the next 100 years whenever people search for things like ‘jpeg progressive comparison’ or what not, your article will be near the top if not the top.

I certainly think you should do a ‘Summary’ article at the end where you list out very simple rules as to what image format to choose in what situation.

Even better, implement your findings into YSlow. Have it automatically inspect the images being used and suggest alternatives based on that analysis.

Once again, nice work :)

]]> By: David http://www.yuiblog.com/blog/2008/12/05/imageopt-4/comment-page-1/#comment-527286 David Fri, 05 Dec 2008 18:48:14 +0000 http://yuiblog.com/blog/2008/12/05/imageopt-4/#comment-527286 Hey Stoyan! This is good to know. I know a few people at the recent Yahoo Frontend summit said that progressive loading looked oldschool, but I myself didn't really think so. Personally top-down loading seems more annoying in most circumstances, since sometimes I might not want to look at the full quality image. Progressive loading seems to give the user a preview while loading, almost like a fuzzy thumbnail image. Also noticed smushit.com already converts JPEG to progressive for you! Nice! (well, for those images over 10k!) Hey Stoyan! This is good to know. I know a few people at the recent Yahoo Frontend summit said that progressive loading looked oldschool, but I myself didn’t really think so. Personally top-down loading seems more annoying in most circumstances, since sometimes I might not want to look at the full quality image. Progressive loading seems to give the user a preview while loading, almost like a fuzzy thumbnail image.

Also noticed smushit.com already converts JPEG to progressive for you! Nice! (well, for those images over 10k!)

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