Writing IIOImage as TIFF

Question

When I read an IIOImage from a TIFF file, and then turn around and write that IIOImage back to a different TIFF file, the resultant file is chewed up (the image looks like it has had a bad hair day).
If I create a new IIOImage based on the one I read, then write that to a new TIFF file, it works like a champ.
When I write the original IIOImage to other formats (GIF, PNG, JPEG), they come across perfectly.
Can anyone explain what might be causing this? The code snippet below should create the problem (uncomment the TEST CASE 1 or TEST CASE 2 line).
Thanks much,
- K
public void test(){
     ImageReader reader = (ImageReader)ImageIO.getImageReadersByFormatName("tif").next();
     System.out.println("Found reader " + reader);
     ImageInputStream iis = new FileImageInputStream(file);
     reader.setInput(iis);
     IIOImage iimage = reader.readAll(0, new ImageReadParam());
     String outputFilename = name + "2.tif";
     File outputFile = new File(outputFilename);
     ImageWriter writer = (ImageWriter)ImageIO.getImageWritersByFormatName(selection).next();
     System.out.println("Found writer " + writer);
     ImageOutputStream ios = new FileImageOutputStream(outputFile);
     writer.setOutput(ios);
// TEST CASE 1:  this creates a junk TIFF
//      writer.write(image);
// TEST CASE 2: this creates a nice looking TIFF
//     writer.write(new IIOImage(image, null, null));     
     ios.close();
}

Answer 1

ImageWriter writer = (ImageWriter)ImageIO.getImageWritersByFormatName(selection).next();
System.out.println("Found writer " + writer);Perhaps Because: You are choosing the First Writer available that claims to be
able to encode ".tif"
Now I'm not very cluey on this, but from my 'work' with imageIO
it seems that the Iterator of readers / writers does not always come back the same way,
By Luck I've been getting an OK TIF writer the first time,
But for the readers I'm not so lucky.
I 'loop' over the Iterator of Writers, til I get one that didn't come back with some sort of complaint.
OR Exception not mentioned in the docs!
If someone could help by showing how to choose the "correct" reader / writer , perhaps using the IIOMetadata , it would be great!
As to WHy TEST CASE 1 and TEST CASE 2 Are different
I would assume that by instantiating a new IIOImage()
with no Thumbnails and null Metadata:
The returned IIOImage is in a format that JAVA ImageIO "Likes Better"
Your Original Image may have Metadata in it ? {I'm not sure if that comes in for free or not } and that Metadata is from your code
Unset, In TEST CASE 2 you specifically set it to null.
Whereas TEST CASE 1 does this:
public void write(IIOImage image)throws IOException
     Appends a complete image stream containing a single image with default metadata and thumbnails to the output. This method is a shorthand for
     write(null, image, null). I'd guess the First Writer out of the Iterator behaves better with the supplied data.
Interpreting Metadata ?