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  1. #1
    SitePoint Evangelist
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    I'm working on a web site that must be view on mac and pc.
    I'm testing it on IE and Netscape.

    I've choose (for any special reason) to work with PNG images. But I've notice (unfortunely) that on 20 images only five are show on the mac. All the Gif images are show.

    Well, now I'm changing the images to Gif format.

    Any comments?

    Thank you.

    Magi::::

  2. #2
    Misfit
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    Were the browsers on the Mac you used up-to-date? I believe only NS and IE versions 4 and above can handle PNG images, though it might be versions 3 and above.

  3. #3
    SitePoint Evangelist
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    I'm not sure but I think the versions are 4 and above.

    I've to check that.

  4. #4
    SitePoint Wizard
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    magi,

    Try the following link, it may explain some of your problems.

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

  5. #5
    SitePoint Evangelist
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    thank you. i'll read that.

  6. #6
    SitePoint Wizard
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    I have to ask why you are useing PNG ? Why not Gif or Jpeg?

    Chuck
    "Happiness doesn't find you, you find happiness" -- Unknown
    www.chuckknows.com

  7. #7
    SitePoint Evangelist
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    Hi.

    Usually I just used JPEG for photos. In this case there isn't any.

    As I said on the first post. I decided to use PNG for any special reason....

    (But there are some PNG images that are view on the mac. That's why I don't understand why the others don't appear.)

  8. #8
    SitePoint Wizard
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    magi,

    If the png files have been created in Fireworks that could be your problem. Fireworks uses the ping format as it's native format but it also adds some info of it's own to the header. In Fireworks you can then export the files as standard ping files.

    It may be some of you ping files are standard ping files and others aren't.

  9. #9
    SitePoint Evangelist
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    That's correct. I made them in Fireworks. I used the Export Preview command and I remember that I chose the Format PNG 8.

    Are you saying that if I've had saved as PNG but on another program (Photoshop) there was no problem?


    "It may be some of you ping files are standard ping files and others aren't."

    1. How do you differ a standard png from another png?
    2. Your advice is to choose the standard ones?

    "but it also adds some info of it's own to the header."

    Oh! Could you explain me this one?


    Great shane.

  10. #10
    SitePoint Wizard
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    If you Exported the file then you should have standard ping files.

    As I understand it Fireworks adds it's own info to the header of the image file to store info about the Fireworks layers/fills/strokes etc. Standard pings don't contain this info. For this reason you should always use standard pings in your web pages.

    As you have 'exported' your pings that you're using I'm really not sure what the problem is. It may be browser related so you could check to see what version browser, including the minor build number, the systems have installed.

    I think that your only reliable option could be jpg's.

    Sorry, I couldn't be of more help.

    Just out of interest why are you using pings? Alpha transparency?

  11. #11
    SitePoint Evangelist
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    "I think that your only reliable option could be jpg's."

    No. I'll used GIF images.

    "Sorry, I couldn't be of more help."

    No. You can be sure that I've learned with your answer.

    I'll read some documentation about PNG images ... trying to understand the problem.

    Some images are view others don't. Something is missing here.

    I've choose (for any special reason) to work with PNG images. Now I think that's no reason to be a reason.

    Thank you.

  12. #12
    SitePoint Evangelist
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    Hi.

    At this moment I think I'm near to give up.


    At http://www.libpng.org/pub/png/pngs-img-ie5mac.html they said ' using Macintosh Internet Explorer 5.0, which currently holds the title of best PNG-supporting browser available.'

    So it's that browser (IE 5) and Netscape 4.73 that is given me a headache.

    I'm going to change all to gif images. (I'm feeling a little stupid with this.)


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