Re: [Gimp-user] PNG files and IE6
Quoth Frank Gore g...@friendlyphotozone.com: There's more to it than just the PNG format, and this isn't really a Gimp thing: http://homepage.ntlworld.com/bobosola/ Many thanks to all respondents. It turns out there are two kinds of transparency; binary alpha channel. IE6 can handle binary but not alpha channel. Something I read next (I forget what/where it was now) made a link between 'binary' and 'indexed' (neither term really meaning anything to me) so I used Gimp to creat a new image, chose to fill it with a transparent background and then switched to Indexed mode (as opposed to RGB or Greyscale) before exporting to PNG, and it worked! So, in short, if you want your transparent PNGs to work in IE6, switch to indexed mode before you export... it really does seem to be as simple as that. Sebastian ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] PNG files and IE6
On 05/27/2010 12:51 PM, Sebastian Tennant wrote: Quoth Frank Gore g...@friendlyphotozone.com: There's more to it than just the PNG format, and this isn't really a Gimp thing: http://homepage.ntlworld.com/bobosola/ Many thanks to all respondents. It turns out there are two kinds of transparency; binary alpha channel. IE6 can handle binary but not alpha channel. Something I read next (I forget what/where it was now) made a link between 'binary' and 'indexed' (neither term really meaning anything to me) so I used Gimp to creat a new image, chose to fill it with a transparent background and then switched to Indexed mode (as opposed to RGB or Greyscale) before exporting to PNG, and it worked! So, in short, if you want your transparent PNGs to work in IE6, switch to indexed mode before you export... it really does seem to be as simple as that. Sebastian Can't doing this result in some loss of image quality? Sometimes I'll make PNGs with a drop shadow and transparency and when I convert the image to indexed mode, the drop shadow quality suffers. Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] PNG files and IE6
On 05/27/2010 01:47 PM, Stefan Maerz wrote: On 5/27/2010 3:38 PM, Tom Williams wrote: Can't doing this result in some loss of image quality? Sometimes I'll make PNGs with a drop shadow and transparency and when I convert the image to indexed mode, the drop shadow quality suffers. Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user If I am not mistaken, binary transparency does not support partial transparency, so drop shadow quality should suffer. Stefan Maerz Thanks for the info! :) Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] PNG files and IE6
On 05/27/2010 02:00 PM, niski wrote: W dniu 2010-05-27 22:38, Tom Williams pisze: On 05/27/2010 12:51 PM, Sebastian Tennant wrote: Quoth Frank Goreg...@friendlyphotozone.com: There's more to it than just the PNG format, and this isn't really a Gimp thing: http://homepage.ntlworld.com/bobosola/ Many thanks to all respondents. It turns out there are two kinds of transparency; binary alpha channel. IE6 can handle binary but not alpha channel. Something I read next (I forget what/where it was now) made a link between 'binary' and 'indexed' (neither term really meaning anything to me) so I used Gimp to creat a new image, chose to fill it with a transparent background and then switched to Indexed mode (as opposed to RGB or Greyscale) before exporting to PNG, and it worked! So, in short, if you want your transparent PNGs to work in IE6, switch to indexed mode before you export... it really does seem to be as simple as that. Sebastian Can't doing this result in some loss of image quality? Sometimes I'll make PNGs with a drop shadow and transparency and when I convert the image to indexed mode, the drop shadow quality suffers. Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user Opacity in indexed mode is binary like in GIFs (that is, any pixel is either opaque or transparent but not e.g half-transparent)... If you really need to have PNGs with indexed opacity in IE6, you have IE6 filters (they are written in CSS files) at your disposal. If you know you won't have any gradients or anything like that under the shadow, you can just cut small part with background and shadow over it. Best regards, niski Thanks for the info! :) Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] PNG files and IE6
On 05/27/2010 03:03 PM, Branko Vukelic wrote: On Thu, May 27, 2010 at 10:38 PM, Tom Williams tomd...@comcast.net wrote: Can't doing this result in some loss of image quality? Sometimes I'll make PNGs with a drop shadow and transparency and when I convert the image to indexed mode, the drop shadow quality suffers. There are ways to do this correctly and keep the image visually similar to the original 24-bit PNG (the one with alpha). You must know the color of the background on which you'll be putting the 8-bit PNG (binary transparency) before you can do so, though. Once you know the background color: 1. Create a layer filled with background color 2. Put the layer behind the image with drop shadow 3. Flatten the image and add alpha to the only remaining layer 4. Use select by color tool and click somewhere where background shows though 5. Clear the selection (delete it) 6. Now save the result as 8-bit PNG and it should work (Of course, it'll be clearer when you actually do these steps.) HTH Thanks for the info! :) Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] PNG files and IE6
On 05/27/2010 02:56 PM, Frank Gore wrote: On Thu, May 27, 2010 at 4:38 PM, Tom Williams tomd...@comcast.net wrote: Can't doing this result in some loss of image quality? Sometimes I'll make PNGs with a drop shadow and transparency and when I convert the image to indexed mode, the drop shadow quality suffers. The problem with indexed colour is that the PNG format is still technically limited to 8bit in its colour palette in this mode, just like GIF was. So yes, you can lose tons of quality and colour. Thing is, IE6 is pretty much deprecated at this point anyways. Most new templates for things like Joomla, Drupal et al do not include full support for IE6 anymore. Now if only people would stop installing old versions of Windows XP, we'd all be better for it :) Thanks! Peace... Tom ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] PNG files and IE6
On Fri, May 28, 2010 at 12:19 AM, Tom Williams tomd...@comcast.net wrote: Thanks for the info! :) Tom, there's no need to spam the list with thanks (as far as I'm concerned), and quote whole messages just to say Thanks. ;) -- Branko Vukelić bg.bra...@gmail.com stu...@brankovukelic.com Check out my blog: http://www.brankovukelic.com/ Check out my portfolio: http://www.flickr.com/photos/foxbunny/ Registered Linux user #438078 (http://counter.li.org/) I hang out on identi.ca: http://identi.ca/foxbunny ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
