Solved

PNG Support

Posted on 2001-08-27
5
453 Views
Last Modified: 2013-12-25
My research indicates that PNG is supported by Netscape and IE browsers, versions 4 and higher.

Does anyone out there have experience that supports or contradicts this across multiple operating systems? I also am interested in any comments about the general ability to render PNG graphics by the software in use by the populace at large.

Thank you,
0
Comment
Question by:awalters
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 30

Expert Comment

by:weed
ID: 6429963
PNG is NOT supported by IE on Windows platforms but IS supported by IE on Mac. Otherwise NS supports it all the way across. Also, some of the browsers may support PNG but dont support alpha channels in PNG files which is really the only reason one would use a PNG. When MS gets its act together and impliments PNG supports for IE windows then it will be worth using it on a wider basis.
0
 
LVL 3

Accepted Solution

by:
Snazzy_Graphics earned 100 total points
ID: 6430374
You can view PNG in both NN and IE on pc. It's the lack alpha trans that is missing. In IE, even index based trans is quirky--so that about makes it useless--until that is fixed, you'll still want to reach for a gif. There's some other problems in IE too, adding to the quirks.

Netscape handles it a little better, but has quirks too. But who's using Netscape?

Native support is the issue--you can have your visitors install various plugs which get past these problems.

The IE 6 beta doesn't fix anything with PNG, so M$ apparently doesn't really care about the issue.

I've been interested in PNG for years because it encodes gamma in the image. This is really important for cross platform issues and some projects with scientific and medical imaging for the web. Also you get past the legal stuff with gif's.

This is the spot for full info:

http://www.libpng.org/pub/png/

(There's also a good mail list and usenet group).

0
 
LVL 3

Expert Comment

by:DCS092999
ID: 6434029
As other experts said above, PNG support in the two big browsers has been incomplete.  Technically, versions 4+ may display PNG's on a web page, but without all of the advancements over the GIF format and also often unreliably.  The site Snazzy mentioned is the online authority on the format.  A few other things to note:

A good site to test individual browsers for alpha transparency and gamma correction support:
http://www.w3.org/Graphics/PNG/
(IE 5 and Opera 5 for PC failed this test, and NN 4.75 failed it even worse.  I've read that NN 6 supports alpha transparency well, maybe someone else can verify that one?)

Also, a quirky thing about IE 4 for PC is that it won't display standalone PNG images, only PNG's on an html page.  And MSIE 5 for PC won't reliably display standalone PNG's on all PC's, or may display them on screen but fail to print them.
0
 

Author Comment

by:awalters
ID: 6435284
Thanks for the excellent information and the link.
0
 
LVL 3

Expert Comment

by:Snazzy_Graphics
ID: 6435795
Glad it helped. Just wish they'd fix this--great format.
0

Featured Post

Secure Your WordPress Site: 5 Essential Approaches

WordPress is the web's most popular CMS, but its dominance also makes it a target for attackers. Our eBook will show you how to:

Prevent costly exploits of core and plugin vulnerabilities
Repel automated attacks
Lock down your dashboard, secure your code, and protect your users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
replica website 2 71
PHP Curl to output a url 7 120
migrating to phpbb forum from vBulletin 4.2 3 94
Javascript: Setting a dropdown based on another dropdown selection 5 53
Boost your ability to deliver ambitious and competitive web apps by choosing the right JavaScript framework to best suit your project’s needs.
FAQ pages provide a simple way for you to supply and for customers to find answers to the most common questions about your company. Here are six reasons why your company website should have a FAQ page
This video teaches users how to migrate an existing Wordpress website to a new domain.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question