On Thu, Aug 6, 2009 at 1:40 PM, Matt Mastracci <[email protected]>wrote:
> +1 This works well for us and I'd love to remove the complexity from our > build process. We've dropped the transparency loader for some time now and > it's solved a lot of our IE6 bugginess (including random hard browser > lockups!). > Excellent. That's as good an existence proof as I need. On 6-Aug-09, at 11:29 AM, Joel Webber wrote: > > > If we want to support IE6 fully (which I hate having to do, but it's hard > to argue with the fact that it still account for ~20% of the market, > depending upon whose stats you use), then I think this is basically the only > approach that will work. We all agree that the DirectX filter is far too > memory hungry, especially on the old machines that are often still running > IE6. Bundling images with disparate palettes into a single 8-bit image is > far too unpredictable, which seems pretty unacceptable to me. So I will > argue that we should, on IE6: > - Leave GIFs alone. > > - Turn PNGs with transparency into GIFs. > - Open question: How should we clamp the [0, 255] alpha channel to [0, > 1]? > > > In our experience, every transparency clamping preset will result in > artifacts in IE6 for some subset of images. To simplify things, I'd suggest > mapping alpha of 0 to transparent, and alpha of 1-255 -> opaque. If the > developer needs more control, they can convert the image to a GIF by > hand. Alternatively, it might be useful to allow a developer to specify a > fallback IE6-only image. > > For quantization of partially transparent PNG to GIF, I highly recommend > the algorithm behind this tool: > http://members.ozemail.com.au/~dekker/NEUQUANT.HTML There's already a > Java version of the code available. > Looks like it's being used in javax.media.jai. If that's available to us reliably, then we should probably use it. Side note: God, I thought I would never have to think about this problem again after everybody finally dropped their old VGA cards, and we could at least just deal with 5-5-5 vs. 5-6-5 16-bit color modes in all our assembly code. Wait, did I just date myself pretty badly? --~--~---------~--~----~------------~-------~--~----~ http://groups.google.com/group/Google-Web-Toolkit-Contributors -~----------~----~----~----~------~----~------~--~---
