Forgot your password?
New user?
Document Actions
#123: Support alphachannel PNGs
- Contents
Plone should automatically work around the bugs in Internet Explorer so that we can start using transparent PNGs for the icons.
- Proposed by
- Alexander Limi
- Proposal type
- User interface
- State
- being-discussed
Motivation
Currently, there is no way to use PNG images with alpha channel information in Plone running on Internet Explorer.
We'd like to switch Plone's default icon format to PNG — but before we can do that, we need to implement one of the workaround implementations that already exist.
Proposal
We should look at something like Dean Edwards' IE7 or a different solutions to fix this problem.
I'd like to include IE7 wholesale in Plone, but our last attempt at this resulted in a massive slowdown on loading a page, so we'll have to re-evaluate and do some tweaking if we want to include it.
Risks
- Fixing this for all the icons on a standard page might turn out as too slow.
- We should make sure this works with images in the CSS classes too (background images etc)
IE7 still slow
Posted by
Alexander Limi
at
March 16, 2006 - 22:09
Yes, IE7 is still slow, but the PNG fixing code can be extracted (or use one of the standalone solutions out there).
In any case, I hope to be able to rewrite the Plone CSS for 3.0, making it more efficient. Not sure if it will be fast enough to make use of IE7, though.
In any case, I hope to be able to rewrite the Plone CSS for 3.0, making it more efficient. Not sure if it will be fast enough to make use of IE7, though.
+1 for this PLIP
Posted by
Rank Lee
at
March 23, 2007 - 02:47
the alpha channel is a great exciting image display, till now only PNG file format support it.
so I'm eager to see pictures in my plone site are made using PNG format.
so I'm eager to see pictures in my plone site are made using PNG format.
More IE6 png alpha resources
Posted by
Olle Jonsson
at
May 7, 2007 - 11:36
Hi, just checking in on this old Ticket.
On IE6, the alpha for PNG has some quirks. Twinhelix's fix for this is instructive.
http://www.twinhelix.com/css/iepngfix/
Please note the "sizingMethod" attribute the AlphaImageLoader is using. It is set to sizingMethod='scale'. "Scale" in this case refers to the IMG attributes height and width. If these attributes are not present on the PNG image element, the scale sizingMethod will not work.
The Twinhelix fix also takes care of background-images.
http://webfx.eae.net/dhtml/pngbehavior/pngbehavior.html
More (explanatory) detail under "Troubleshooting" at http://homepage.ntlworld.com/bobosola/pnginfo.htm
On IE6, the alpha for PNG has some quirks. Twinhelix's fix for this is instructive.
http://www.twinhelix.com/css/iepngfix/
Please note the "sizingMethod" attribute the AlphaImageLoader is using. It is set to sizingMethod='scale'. "Scale" in this case refers to the IMG attributes height and width. If these attributes are not present on the PNG image element, the scale sizingMethod will not work.
The Twinhelix fix also takes care of background-images.
http://webfx.eae.net/dhtml/pngbehavior/pngbehavior.html
More (explanatory) detail under "Troubleshooting" at http://homepage.ntlworld.com/bobosola/pnginfo.htm
IE7 library needs PHP rewritten to Python
Posted by
Olle Jonsson
at
May 8, 2007 - 10:54
After skimming Dean's IE7 solution, I now know that it currently uses server-side PHP scripts to do some work, and they need to be turned into Python.
Source, this thread: https://sourceforge.net/forum/forum.php?thread_id=1664215&forum_id=379297
Source, this thread: https://sourceforge.net/forum/forum.php?thread_id=1664215&forum_id=379297
IE7 library needs PHP rewritten to Python
Posted by
Olle Jonsson
at
May 8, 2007 - 10:57
After skimming Dean's IE7 solution, I now know that it currently uses server-side PHP scripts to do some work, and they need to be turned into Python.
Source, this thread: https://sourceforge.net/forum/forum.php?thread_id=1664215&forum_id=379297
Source, this thread: https://sourceforge.net/forum/forum.php?thread_id=1664215&forum_id=379297
8bit PNG
Posted by
Darryl Dixon
at
February 26, 2008 - 23:05
What about 8bit PNG? Especially for icons this is probably sufficient, and it degrades nicely in IE6 to no worse than current GIF support:
http://www.sitepoint.com/blogs/2007/09/18/png8-the-clear-winner/
http://www.sitepoint.com/blogs/2007/09/18/png8-the-clear-winner/
Yup, as detailed on the Plone logo page
Posted by
Alexander Limi
at
February 27, 2008 - 04:25
…it is what I recommend. This PLIP needs to be updated, that's all. :)
http://plone.org/about/logo has the details.
http://plone.org/about/logo has the details.
Too slow?
Limi, at one point I remember you toying with IE7 and saying it was far to slow to be useful to Plone. Has something changed here? Also, I seem to recall certain versions of Safari doing unacceptable things to PNG's when trying to auto-correct gamma sutff. Isn't this still the case?