24-bit .pngs on iPhone 5

I often use 24-bit transparent .png files in web design. I recently checked an iPhone 5, mostly to look at the viewport, and noticed my .png files all have a black matte?
Went back and checked an iPhone 4 and everything looks fine there. Not sure what to say. I've been saving files the same way since 2007! Either a save-for-web from Photoshop or a direct save-as. Any ideas?

We checked it with an iPhone 5 in house multiple times and could not reproduce this Problem. Must be something specific to your device. Maybe your speakerphone volume is turned down completely?
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What bit depth are you converting from... and how did you create the PNG in the first place?
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Thank you for your prompt response!   I apologize if I misused the term "premultiplied."   Here's what I am familiar with the term from:   https://helpx.adobe.com/premiere-pro/using/compositing-alpha-channels-adjusting-clip.html
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"Blue"
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as attached files.
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Attachments:
T16Bit.png ‏1709 KB
Test4-8Bit.png ‏464 KB
Sub_ImgLineProfile.vi ‏84 KB

Bonjour LemonWang,
A priori, ce n'est pas votre VI mais votre image qui pose problème. J'ai fait le test avec une autre image et le VI run en 8 et 16 bits.
Je vous met l'ensemble des fichiers en PJ (photos et Photo de TEST en 16bits avec votre VI)
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PS: il y a une erreur dans votre code: -1074396080. Pensez a toujours mettre un fil d'erreur pour vérifier que tout se passe bien.
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National Instruments France
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Photo.zip ‏2232 KB

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Thnks for the quick answer.
I believe I'm being consistent. I get the image type from the properties value of the IMAQ session and that's the value I use for the Grab Acqure VI and the Extract Tetragon VI. I think the type is grayscale U16.
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Dear all,
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Still need help, I could do it for a value lower. contact me at [email protected]

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Kathleen13 wrote:
> I have just upgraded my Macromedia Studio 8 to Adobe
CS3, and it seems that I
> still can't export a 24 bit png with transparency from
Fireworks (Photoshop can
> do it, but it's just not suited for volume graphic
production). Anyone know
> something I don't, or can someone at least explain why I
can have alpha
> transparency on 8 bit and 32 bit, but not 24 bit pngs?
Currently, I'm planning
> to export everything from Fireworks, then batch-process
through Photoshop to
> reduce from 32 bit to 24 bit, which is just... gah!
Words fail me.
>
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Jim Babbage - .:Community MX:. & .:Adobe Community
Expert:.
Extending Knowledge, Daily
http://www.communityMX.com/
CommunityMX - Free Resources:
http://www.communitymx.com/free.cfm
.:Adobe Community Expert for Fireworks:.
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news://forums.macromedia.com/macromedia.dreamweaver

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First, when you Grab or Snap an image in LabVIEW with the Vision utilities, you will have to use 16bit format. This is a big pain, and a serious waste of memory, but necessary. I strongly recommend that if you are doing any kind of image manipulation or processing, that you keep it 10bit.
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