Comments on: Techniques for Squeezing Images for All They’re Worth http://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/ Web Design Resources and Tutorials Sat, 11 Feb 2012 10:53:00 +0000 hourly 1 http://wordpress.org/?v=abc By: aledesign.ithttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572257 aledesign.it Wed, 24 Mar 2010 20:32:41 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572257 Nice article..so useful. Thanks Nice article..so useful. Thanks

]]> By: Robhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572249 Rob Wed, 24 Mar 2010 19:03:21 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572249 I forgot to mention that JPEG2000 has almost no browser support. I forgot to mention that JPEG2000 has almost no browser support.

]]> By: Robhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572248 Rob Wed, 24 Mar 2010 19:01:53 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572248 Unfortunately, that isn't part of the JPEG spec. Some programs have figured out how to bend the rules, but I wouldn't recommend using it since you'd be generating corrupted images, so you might get bad results.One of the new features of JPEG2000 is exactly what you're looking for. They call it "Random code-stream access and processing" (http://www.computer.org/portal/web/csdl/doi/10.1109/DSD.2004.1333281). Photoshop CS3 and CS4 do a great job supporting this new feature, but you need to install the JPEG2000 plugin from the Goodies folder on the installer DVD. Unfortunately, that isn’t part of the JPEG spec. Some programs have figured out how to bend the rules, but I wouldn’t recommend using it since you’d be generating corrupted images, so you might get bad results.

One of the new features of JPEG2000 is exactly what you’re looking for. They call it “Random code-stream access and processing” (http://www.computer.org/portal/web/csdl/doi/10.1109/DSD.2004.1333281). Photoshop CS3 and CS4 do a great job supporting this new feature, but you need to install the JPEG2000 plugin from the Goodies folder on the installer DVD.

]]> By: Ben Gremillionhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572232 Ben Gremillion Wed, 24 Mar 2010 17:02:49 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572232 If it's possible, I haven't seen it. A jpg image has one compression setting for the entire file.The closest technique might be to slice the original image into different files, each with its own compression (or even its own file format). Adobe ImageReady has a good range of options with its slice tool.Another idea: Try blurring the background slightly. As areas with hard edges tend to compress better, regions with less detail should help a jpg's overall file size. If it’s possible, I haven’t seen it. A jpg image has one compression setting for the entire file.

The closest technique might be to slice the original image into different files, each with its own compression (or even its own file format). Adobe ImageReady has a good range of options with its slice tool.

Another idea: Try blurring the background slightly. As areas with hard edges tend to compress better, regions with less detail should help a jpg’s overall file size.

]]> By: Merlinhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572228 Merlin Wed, 24 Mar 2010 16:41:47 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572228 Can you define parts of a jpeg with different compression qualities? For example a persons face would retain high quality while the backdrop is low-quality & thus lower file size? I would think software specializing in exporting jpegs could do this. Can you define parts of a jpeg with different compression qualities? For example a persons face would retain high quality while the backdrop is low-quality & thus lower file size? I would think software specializing in exporting jpegs could do this.

]]> By: Punta del Este Real Estatehttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572204 Punta del Este Real Estate Wed, 24 Mar 2010 15:12:58 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572204 great article, i usually save for web with medium quality.hey how about a newsletters article!!!!!!!! dont know why there is no information about making newsletters online, guess that designers dont want to share that. i had to learn all by my self. and i really love to have something to compare. great article, i usually save for web with medium quality.

hey how about a newsletters article!!!!!!!! dont know why there is no information about making newsletters online, guess that designers dont want to share that. i had to learn all by my self. and i really love to have something to compare.

]]> By: Robhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572123 Rob Wed, 24 Mar 2010 04:10:26 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572123 Don't confuse 8-bit PNGs with 8-bit+alpha PNGs. The latter contains an additional 8 bits of transperency data and doesn't work in IE 6. The former only supports setting a single palette color as transparent (exactly like GIF) and works anywhere GIF does.There's a LOT of misinformation out there about PNG. Don’t confuse 8-bit PNGs with 8-bit+alpha PNGs. The latter contains an additional 8 bits of transperency data and doesn’t work in IE 6. The former only supports setting a single palette color as transparent (exactly like GIF) and works anywhere GIF does.

There’s a LOT of misinformation out there about PNG.

]]> By: Jeremy Carlsonhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572122 Jeremy Carlson Wed, 24 Mar 2010 03:26:02 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572122 I also thought only Fireworks supported PNG-8 with Alpha Transparency. I am pretty sure Photoshop does not yet. And yes I have to support IE6 still. I also thought only Fireworks supported PNG-8 with Alpha Transparency. I am pretty sure Photoshop does not yet. And yes I have to support IE6 still.

]]> By: Dannyhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572121 Danny Wed, 24 Mar 2010 03:20:19 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572121 Ben, hands down best image compression article I've read. This is a topic near and dear to me since I create elearning courses for low to medium range bandwidth, so I, like you, try to push every pixel's compression.I was starting to write up an article like this for my blog... so may quote from this article (with credit) if any of the concepts make it over. For more depth, I would have also been interested to see a comparison of transparency channels with GIF and PNG (and alpha transparency with PNG 24). Though I know that's beyond the scope of what most users need to know.Anywho, awesome job! Ben, hands down best image compression article I’ve read. This is a topic near and dear to me since I create elearning courses for low to medium range bandwidth, so I, like you, try to push every pixel’s compression.

I was starting to write up an article like this for my blog… so may quote from this article (with credit) if any of the concepts make it over. For more depth, I would have also been interested to see a comparison of transparency channels with GIF and PNG (and alpha transparency with PNG 24). Though I know that’s beyond the scope of what most users need to know.

Anywho, awesome job!

]]> By: Ben Gremillionhttp://www.webdesignerdepot.com/2010/03/techniques-for-squeezing-images-for-all-they%e2%80%99re-worth/#comment-572116 Ben Gremillion Wed, 24 Mar 2010 02:37:40 +0000 http://www.webdesignerdepot.com/?p=16101#comment-572116 Please do. The more ideas and techniques we share, the better for the community. Please do. The more ideas and techniques we share, the better for the community.

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