Comments for Jon Stahl's Journal http://jstahl.org Politics, the environment, technology, activism. And stuff. Tue, 09 Mar 2010 13:40:40 -0800 http://wordpress.org/?v=2.9.2 hourly 1 Comment on More thoughts on automated image optimization for Plone by Anthony Gerrard http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395138 Anthony Gerrard Tue, 09 Mar 2010 13:40:40 +0000 http://jstahl.org/?p=2180#comment-395138 <p>We recently had a user upload two bmp files that were 28MB each. I think it would be wise to include bmp file type in your list of image types that can be converted to jpegs. Unfortunately there are users out there who are quite ignorant about image formats, dimensions and compression.</p> <p>I know it's slightly out of scope but a similar tool to pick up large File objects would be useful for administrators. We'd really like to know if a user has uploaded a 100MB powerpoint.</p> We recently had a user upload two bmp files that were 28MB each. I think it would be wise to include bmp file type in your list of image types that can be converted to jpegs. Unfortunately there are users out there who are quite ignorant about image formats, dimensions and compression.

I know it’s slightly out of scope but a similar tool to pick up large File objects would be useful for administrators. We’d really like to know if a user has uploaded a 100MB powerpoint.

]]> Comment on We are the slug people. by Jon Stahl http://jstahl.org/archives/2010/03/07/we-are-the-slug-people-2/comment-page-1/#comment-395134 Jon Stahl Tue, 09 Mar 2010 03:40:21 +0000 http://jstahl.org/archives/2010/03/07/we-are-the-slug-people-2/#comment-395134 <p>Indeed we are. Any day now. :-)</p> Indeed we are. Any day now. :-)

]]> Comment on We are the slug people. by Sophia Katt http://jstahl.org/archives/2010/03/07/we-are-the-slug-people-2/comment-page-1/#comment-395133 Sophia Katt Tue, 09 Mar 2010 01:31:18 +0000 http://jstahl.org/archives/2010/03/07/we-are-the-slug-people-2/#comment-395133 <p>Speaking of Molly, aren't you due very soon to welcoming another little bit into the family? Not that the slugs reminded me of your progeny...</p> Speaking of Molly, aren’t you due very soon to welcoming another little bit into the family? Not that the slugs reminded me of your progeny…

]]> Comment on More thoughts on automated image optimization for Plone by Alec Mitchell http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395117 Alec Mitchell Thu, 04 Mar 2010 19:30:09 +0000 http://jstahl.org/?p=2180#comment-395117 <p>Matt,</p> <p>Yes, I use ANTIALIAS in PIL transformations, but I've had clients for whom the result was not acceptable. ImageMagick is pretty close to state of the art as far as scaling goes and the techniques it uses go far beyond anti-aliasing (See: http://www.imagemagick.org/Usage/resize/). There are comparisons to Photoshop and some anti-aliased scaling output here: http://www.xs4all.nl/~bvdwolf/main/foto/down_sample/example1.htm</p> <p>It also supports an almost magical "liquid scaling" feature that can change an aspect ratio without significantly distorting the image content.</p> <p>I wouldn't suggest making it a dependency for Plone though, because it's a pain to install. For an add-on that wants to offer quality image transformations, it should be seriously considered, IMHO. Also, if you want to offer flipping/rotation of JPEG images, using libjpeg/jpegtran/jhead allows for extremely fast lossless transforms (whereas both PIL and ImageMagick degrade JPEGs on each transform). See: http://www.imagemagick.org/Usage/formats/#jpg_lossless</p> Matt,

Yes, I use ANTIALIAS in PIL transformations, but I’ve had clients for whom the result was not acceptable. ImageMagick is pretty close to state of the art as far as scaling goes and the techniques it uses go far beyond anti-aliasing (See: http://www.imagemagick.org/Usage/resize/). There are comparisons to Photoshop and some anti-aliased scaling output here: http://www.xs4all.nl/~bvdwolf/main/foto/down_sample/example1.htm

It also supports an almost magical “liquid scaling” feature that can change an aspect ratio without significantly distorting the image content.

I wouldn’t suggest making it a dependency for Plone though, because it’s a pain to install. For an add-on that wants to offer quality image transformations, it should be seriously considered, IMHO. Also, if you want to offer flipping/rotation of JPEG images, using libjpeg/jpegtran/jhead allows for extremely fast lossless transforms (whereas both PIL and ImageMagick degrade JPEGs on each transform). See: http://www.imagemagick.org/Usage/formats/#jpg_lossless

]]> Comment on More thoughts on automated image optimization for Plone by Geir Bækholt http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395112 Geir Bækholt Wed, 03 Mar 2010 22:42:07 +0000 http://jstahl.org/?p=2180#comment-395112 <p>Yes! This functionality would be very useful, — but the configuation seems a tad technical for control panels. There is little reason to vary these settings from site to site. I'd be happy to see this happening automatically in the background instead of adding more buttons to tweak. :)</p> Yes! This functionality would be very useful, — but the configuation seems a tad technical for control panels.
There is little reason to vary these settings from site to site. I’d be happy to see this happening automatically in the background instead of adding more buttons to tweak. :)

]]> Comment on More thoughts on automated image optimization for Plone by Jon Stahl http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395111 Jon Stahl Wed, 03 Mar 2010 20:35:49 +0000 http://jstahl.org/?p=2180#comment-395111 <p>@Lee, @Cris -- awesome! I will think a bit more about how to fold the ideas Matt mentions for the "SuperImageField" into this. I was thinking more from a site admin point of few, not at the individual content creator level, but it would be really great to think at that level as well -- thanks!</p> @Lee, @Cris — awesome! I will think a bit more about how to fold the ideas Matt mentions for the “SuperImageField” into this. I was thinking more from a site admin point of few, not at the individual content creator level, but it would be really great to think at that level as well — thanks!

]]> Comment on More thoughts on automated image optimization for Plone by Cris Ewing http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395110 Cris Ewing Wed, 03 Mar 2010 19:59:18 +0000 http://jstahl.org/?p=2180#comment-395110 <p>As the manager of a large website with lots of content contributors and <em>lots</em> of images (we do radiology, folks, images is what we are about) I'd be 100% behind any effort to work on this, especially if we can put some focus on allowing content creators to manage the images they upload when they upload them. I can even see if there might be some funds I can shake loose. This would be a great boon to us and we should pony up to support it if possible.</p> <p>c</p> As the manager of a large website with lots of content contributors and lots of images (we do radiology, folks, images is what we are about) I’d be 100% behind any effort to work on this, especially if we can put some focus on allowing content creators to manage the images they upload when they upload them. I can even see if there might be some funds I can shake loose. This would be a great boon to us and we should pony up to support it if possible.

c

]]> Comment on More thoughts on automated image optimization for Plone by Lee Joramo http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395109 Lee Joramo Wed, 03 Mar 2010 17:48:21 +0000 http://jstahl.org/?p=2180#comment-395109 <p>Jon, Sounds great. I have several sites that need this badly. You can put designKiln down for 10% of the project cost up to $500.</p> Jon,
Sounds great. I have several sites that need this badly.
You can put designKiln down for 10% of the project cost up to $500.

]]> Comment on More thoughts on automated image optimization for Plone by Jon Stahl http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395108 Jon Stahl Wed, 03 Mar 2010 17:26:09 +0000 http://jstahl.org/?p=2180#comment-395108 <p>@Julian - Great point! I'll update the article. Thank you!</p> <p>@Matt - PIL vs. ImageMagick - no strong personal opinion, but I trust Alec here. I agree that avoiding dependencies is good. RE: SuperImageField -- I was hoping someone would have something like this -- it would be amazing if you had time to release it in some fashion!</p> @Julian – Great point! I’ll update the article. Thank you!

@Matt – PIL vs. ImageMagick – no strong personal opinion, but I trust Alec here. I agree that avoiding dependencies is good. RE: SuperImageField — I was hoping someone would have something like this — it would be amazing if you had time to release it in some fashion!

]]> Comment on More thoughts on automated image optimization for Plone by Jon Stahl http://jstahl.org/archives/2010/03/02/more-thoughts-on-automated-image-optimization-for-plone/comment-page-1/#comment-395107 Jon Stahl Wed, 03 Mar 2010 17:23:02 +0000 http://jstahl.org/?p=2180#comment-395107 <p>@JohnS -- I agree wholeheartedly, and in fact I mentioned it as afterthought: "Somewhat randomly, I also wanted to take note of Kurt Bendl’s useful recipes for limiting the max KB and pixel dimensions of uploaded AT Images and Files. This might be useful and/or worth exposing in a TTW setting." IOW, Plone already has this capability, it's just buried very, very deeply.</p> @JohnS — I agree wholeheartedly, and in fact I mentioned it as afterthought: “Somewhat randomly, I also wanted to take note of Kurt Bendl’s useful recipes for limiting the max KB and pixel dimensions of uploaded AT Images and Files. This might be useful and/or worth exposing in a TTW setting.” IOW, Plone already has this capability, it’s just buried very, very deeply.

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