BufferedImage display vs memory operations problems.

Question

Having some problems when working with BufferedImages.
The problem:
If I load a greyscale BufferedImage from a JPG on disk using
currImage = ImageIO.read( this.currentImageFile);and display it on a JPanel using
     // Draw image on the current graphics context
            Graphics2D g2Start = (Graphics2D)this.panDisplayStart.getGraphics();
            g2Start.drawImage(ImageHandling.toBufferedImage(startImage),
                    null,
                    this.getCenteringPoints(startImage).x,
                    this.getCenteringPoints(startImage).y);I can now alter this image, say desiderate it as follows:-
private void brightenDarken(BufferedImage anBuffImage, int aScaleFactor){
        float scaleFactor, tempFactor;
        tempFactor = (float)aScaleFactor;
        if(aScaleFactor >= 0)
            scaleFactor = (tempFactor/100) + 1;
        else
            scaleFactor = (tempFactor/100) * -1;
        RescaleOp op = new RescaleOp(scaleFactor, 0, null);
        finnishImage = op.filter(anBuffImage, null);       
        this.repaint();
    }Everything goes fine, this image is altered as expected.
BUT, if I do not first display this image, but load it into memory, and apply the same transformation in memory, when I display the image it is all bright reds and blues?
Can anyone help, I have a feeling this it might be something to do with the imageType property or perhaps the colorModel.
I�m on a tight deadline on this one, and any help or suggestions would be really appreciated.

Answer 1

Hi
I am loading a jpg file using
currImage =
                    ImageIO.read( new FileImageInputStream(this.currentImageFile));where the currentimageifile is a path to a jpg image.
I notice that when i look at the colormodel off the 'currImage' vairable loaded this way I get:-
ColorModel: #pixelBits = 24
numComponents = 3
color space = java.awt.color.ICC_ColorSpace@9931f5 transparency = 1
has alpha = false
isAlphaPre = false
though when I look at the colorModel of the image that I load and display firts before processing I get:-
DirectColorModel: rmask=ff0000 gmask=ff00 bmask=ff amask=0
??? Many thanks.....