Create .png file with transparency?

I'd like to create an image on the server side, and save it as a .png file, and set the transparency. Is there some sample code or an article that would tell me how to get started? Thanks.

com.sun.media.jai.codec.PNGEncodeParam.Palette
* void setPaletteTransparency(byte[] alpha)
sets the alpha values associated with each palette entry. The alpha parameter should have as many entries as there are RGB triples in the palette.
* byte[] getPaletteTransparency()
returns the alpha values associated with each palette entry.
API: com.sun.media.jai.codec.PNGEncodeParam.Gray
* void setTransparentGray(int transparentGray)
sets the gray value to be used to denote transparency. Setting this attribute will cause the alpha channel of the input image to be ignored.
* int getTransparentGray()
returns the gray value to be used to denote transparency.
API: com.sun.media.jai.codec.PNGEncodeParam.RGB
* void setTransparentRGB(int[] transparentRGB)
sets the RGB value to be used to denote transparency. Setting this attribute will cause the alpha channel of the input image to be ignored.
* int[] getTransparentRGB()
returns the RGB value to be used to denote transparency.

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Half a decade later, I am getting the same problem as the original poster (although I am using Illustrator CC 64bit on Windows 8).
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I just purchased Elements to do a very specific task which I can’t do in Aperture. I am a former photoshopper (V.5) and excited to be back.
I am doing a book/scrapbook and the majority of my text will be my own handwriting. I use white paper and black ink and I scan in at the highest settings. My goal is to create my handwriting on a transparent background so I can place it in my book as I choose. For this specific project (which is very large in scope) I wanted to keep my image/file management within Aperture.
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Hello!
In my application I generate "BufferedImage"s with transparent pixels. When I try to write them using ImageIO.write() in PNG format, the transparency information is lost.
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What are you using to view the PNG? Are you sure it is a viewer that supports PNG transparency? Internet Explorer and the previewer built into Windows do not fully support PNG transparency so maybe that's the problem. See http://entropymine.com/jason/testbed/pngtrans/ for more info. I know for a fact the following code will generate a transparent PNG. Photoshop will read the transparency correctly but IE won't.
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After doing a little more investigating, I realized that iPhoto is generating the thumbnails in jpg, therefore creating a non-transparent thumbnail. When the image is viewed full size, it appears fine. So it's just the thumbnail that is causing the problem.
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I created a photo book in Photoshop elements 11 that contains png files with the invisible backgrounds. When I export the book to a jpg or a pdf, the png files appear with white backgrounds. Any suggestions on how to fix this?

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Insanity is hereditary, you get it from your children
If this post or another user's post resolves the original issue, please mark the posts as correct accordingly. This helps other users with similar trouble get answers to their questions quicker. Thanks.

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http://www.imagemagick.org/script/command-line-options.php#alpha
http://www.imagemagick.org/Usage/masking/#remove
http://www.imagemagick.org/index.php
http://www.imagemagick.org/script/command-line-tools.php
http://www.imagemagick.org/script/command-line-options.php
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Create .png file with transparency?

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