PNG Tools? 11

A while back I read about a program that allowed you to change the
default background color that IE uses for semitransparent PNG images. For
example if I create a PNG image with alpha channels in Photoshop and then
try to display that in IE it uses a gray background (the default Mosaic
background color). With this program one was supposed to be able to change
that gray to any color you wanted (for example white). Does anyone know the name
of this program or another one that can do the same thing?

I’m also looking for a program that allows me to optimize PNG images.
This can be achieved by changing the color palette and/or using the
compression format that is part of the PNG specification. Photoshop does
not allow me to do this without losing the alpha channel info and
that is obviously not a viable option.

While on topic. PNG is a first class bitmap format in WinFX. This
means that Windows users will be able to see the web as it is supposed to be seen
in 2006.

  • http://www.forgetfoo.com/ foO

    damn. i keep coming back in hopes that somebody posted the name of this App, as i’d sure like to be able to use it, as well…

    /sigh.

  • http://www.DylanGreene.com Dylan Greene

    Paintshop Pro 8 does it very well.

    - Before and after preview with zoom
    - Compressed and uncompressed sizes
    - Color depth options
    - Transparency options
    - Interlaced/Non
    - Lists download times for 56k up to 720k
    - Has an optional wizard UI
    - All your choices can be saved as presets

    http://www.Jasc.com

    (I don’t work for Jasc, I just like Paintshop Pro.)

  • http://erik.eae.net Erik Arvidsson

    I can’t figure out how to change the background color in PSP for a transparent PNG? The optimization seems nice but 60 megs just for optimization is a bit too much for me.

  • http://hzr.dzygn.com hzr

    Probably not the app you’re talking about, although this one compresses PNG files.
    I’ve also tried to convert GIF files with transperancy, and the transperancy of the PNG files works in IE then.

    http://advsys.net/ken/utils.htm#pngout

  • http://erik.eae.net Erik Arvidsson

    FOUND IT!

    The PNGOut page had a link to a review and that review has a link to Web Image Guru. This program can optimize AND set the fallback background color for transparent PNGs.

    http://www.vimas.com/ve_guru.htm

  • http://www.gesundheit-noni.info Noni

    @eric
    What version of PSP do you have? It isnĀ“t a problem to convert psp files to transparent PNG.

  • http://erik.eae.net Erik Arvidsson

    The problem is that one cannot set the fall back background color for transparent PNGs in PSP. Try to create a PNG and open it in IE. It will use a grey background by default. If you look at the images in this page they use a white background in IE and a transparent background in modern browsers.

  • http://erik.eae.net Erik Arvidsson

    Try this in Opera, Mozilla and IE and you’ll see it pretty clearly:

    javascript:document.body.style.background = “red”; void 0;

  • Donzella
  • http://Phi.Lho.free.fr Philippe Lhoste

    As Donzella says, TweakPNG is a good PNG tool allowing to insert/remove/edit chunks in PNG images.
    The kBGD chunk sets the background color of a PNG image.

    PNGCrush or PNGOut and some others optimize the PNG images. See http://www.libpng.org/pub/png/pngapcv.html for a quite comprehensive listing.

  • http://www.abnfrehmen-trier.com Andy Manolis

    Hey, I think your blog might be having browser compatibility issues. When I look at your website in Safari, it looks fine but when opening in Internet Explorer, it has some overlapping. I just wanted to give you a quick heads up! Other then that, great blog!