It is my understanding that JPEG/JFIF can not have an alpha channel, at
least in it's serialized form. I would suggest using PNG.
...
Kabe
> -----Original Message-----
> From: Discussion list for Java 3D API
> [mailto:[EMAIL PROTECTED]]On Behalf Of Hock, Gregg
> Sent: Tuesday, September 07, 1999 3:41 PM
> To: [EMAIL PROTECTED]
> Subject: [JAVA3D] Creating Transparent Images
>
>
> Folks,
> How does one use the com.sun.image.codec.jpeg package to create an image
> that includes alpha values. I have an array of Point4f values
> representing
> red,green,blue and alpha. I have successfully created jpeg images from an
> array of Point3f values (rgb only) using a BufferedImage and
> Raster. I read
> in the JPEGEncodeParam documentation that an alpha rgb BufferedImage will
> not map to a valid JFIF stream. The runtime error occurs on the
> creation of
> a JPEGEncodeParam object:
> ...jpeg.codec.ImageFormatException: 4 band JFIF files imply CMYK encoding.
>
> Code snibit:
>
> BufferedImage bi = new
> BufferedImage(width,height,BUFFEREDIMAGE.TYPE_4BYTE_ABGR);
> ColorModel cm = bi.getColorModel();
> Raster ra = bi.getAlphaRaster();
> //fill raster in a loop
> ra.setPixel(x,y,abgr); //where abgr is a 4 byte array
> //Create encoder
> BufferedOutputStream bos = new BufferedOutputStream(fos);
> JPEGImageEncoder jie = JPEGCodec.createJPEGEncoder(bos);
> //Create param object using raster and color_id
> int cid = jie.getDefaultColorId(cm);
> JPEGEncodeParam jep = new JPEGEncodeParam(ra,cid);
>
> Please comment....
>
> Thanks,
> Gregg
>
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