Save BufferedImage

[Pyrodragoon]

Hi.
I have a program that creates some BufferedImage with

offscreen = new BufferedImage (2000,2000,BufferedImage.TYPE_INT_ARGB);

I draw something to it and draw a filter with a Color f.e. (new Color(0,0,50,100))
afterwards so that the hole image looks a bit blue with a transparent color.

When I save this Image with the following method something happens that shouldn´t.

This is the method:

try {
ByteArrayOutputStream out = new ByteArrayOutputStream( 0xfff );
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( out );
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(foto);
param.setQuality(1.0f, true );
encoder.encode(Foto, param );
FileOutputStream fos = new FileOutputStream(f);
fos.write( out.toByteArray() );
fos.close();
out.close();
} catch (Exception e) {
}

It should save my Image foto with the maximum of quality and it does,
but what happens is that the colors of my saved JPG don´t match the ones I see when I draw this Image
to the screen.
Why?
How can I change this to get my real pictures saved?

[Abuse]

http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/com/sun/media/jai/codec/JPEGEncodeParam.html#setQuality(float)

This creates new quantization tables that replace the currently installed quantization tables. The created quantization table varies from very high compression, very low quality, (0.0) to low compression, very high quality (1.0) based on the quality parameter.

At a quality level of 1.0 the table will be all 1’s which will lead to no loss of data due to quantization (however chrominace subsampling, if used, and roundoff error in the DCT will still degrade the image some what).

Choose the right tool for the right job; if you want an image saved losslessly, don’t use jpeg - use png.

[Riven]

Actually, the problem is somewhere else. I had this problem, all my images that went through ImageIO.write() turned out a bit pink/redish.

The problem whas that I was writing 4 color-channels (RGBA) to a format that doesn’t handle the alpha at all. Copy your ARGB image to a RGB buffered image, and save that, and the redness will be gone.

[Pyrodragoon]

Thanks,
both ways work well.

[Abuse]

@Riven

Actually, the problem is somewhere else. I had this problem, all my images that went through ImageIO.write() turned out a bit pink/redish.

The problem whas that I was writing 4 color-channels (RGBA) to a format that doesn’t handle the alpha at all. Copy your ARGB image to a RGB buffered image, and save that, and the redness will be gone.

urg, that sounds worthy of a bug parade entry!

[Riven]

http://www.java-gaming.org/forums/index.php?topic=12032.0