Hello.
I wanted to turn a TIFF image into a PNG image w/ transparent background.
I came up with a way, but it involves reading the image, saving the image as PNG (w/o
transparency), reading the image back in again, and finally processing the image and
resaving the image w/ transparent background.
Here is my code:
// Step 1 (load tiff)
RenderedImage tiffImage = JAI.create( "fileload", "my.tiff" );
printInfoAbout( tiffImage );
try
{
// Step 2 (convert to png & save)
File tempPngFile = new File( "myTemp.png" );
ImageIO.write( tiffImage, "png", tempPngFile ); // save as png.
BufferedImageOp transparentOp = new TransparentImageOp(); // mine
// Step 3 (reload png & make transparent)
BufferedImage opaquePng = ImageIO.read( tempPngFile );
BufferedImage transparentPng = transparentOp.filter( opaquePng,
null );
// Step 4 (save transparent png)
File pngFile = new File( "my.png" ); // with transparent background.
ImageIO.write( transparentPng, "png", pngFile );
}
catch ( IOException e )
{
System.out.println ( "Exception caught: " + e.getMessage () );
e.printStackTrace();
}
Surely, there has to be a way to convert the image w/o going through so many steps.
In particular, there should be a way to manipulate the image w/o saving and reloading
it. I think my problem is that I don't know how to make the BufferedImage out of the
tiffImage I created. I don't know which ColorModel to use, because the ones that I do
try end up with an IllegalArgumentException being thrown at runtime.
Here is some info I took from the TIFF image:
The image's dimensions: 1024x1024
This is the raster: ByteInterleavedRaster: width = 1024 height = 1024
#numDataElements 1
The roster is writable.
Translate X is: 0
Translate Y is: 0
This is the sample model: java.awt.image.PixelInterleavedSampleModel@1050000
data type is: 0 (which is DataBuffer.TYPE_BYTE)
transfer type is: 0 (which is DataBuffer.TYPE_BYTE)
sample model width is: 1024
sample model height is: 1024
# of samples per pixel is: 1
# of data elements is: 1
sample sizes for model are: {8}
the band offsets are: 0
Here are some pixels from getPixels( 100, 100, 3, 10, (int [])null ):
176, 176, 176, 183, 183, 176, 176, 176, 183, 176,
176, 176, 176, 176, 176, 176, 176, 176, 176, 176,
176, 176, 176, 176, 176, 176, 176, 176, 176, 176
A sample would be: 176 This corresponds to a black pixel.
Could anyone help me?
Thanks in advance.
P.S.:
When I try:
BufferedImage opaqueImage = new BufferedImage( tiffImage.getWidth(),
tiffImage.getHeight(),
BufferedImage.TYPE_INT_RGB );
opaqueImage.setData(tiffImage.getData()); // <-- get data from TIFF
I get the following exception:
java.lang.ArrayIndexOutOfBoundsException: 1024
at
java.awt.image.SinglePixelPackedSampleModel.setPixels(SinglePixelPackedSampleModel.java:670)
at java.awt.image.WritableRaster.setPixels(WritableRaster.java:547)
at sun.awt.image.SunWritableRaster.setPixels(SunWritableRaster.java:132)
at java.awt.image.BufferedImage.setData(BufferedImage.java:1390)
at ImageTransformer.transformImages(ImageTransformer.java:208)
at ImageTransformer.main(ImageTransformer.java:34)
But the TIFF image is 1024 x 1024 pixels. That's what I don't understand.
Do you understand what is happening?
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