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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