Can't invert an image

Hello,
          I've been working on Java Advanced Imaging for a while to create FAX TIFF, but failed to invert the image's color (which was negative white-on-black) to positive.
          BufferedImage form_img;
          RenderedOp rop;
          ParameterBlock pb;
          pb = new ParameterBlock();
          pb.addSource(form_img);
          rop = JAI.create("invert",form_img);
          System.out.print("rop = " + rop + "\n\n"); // DEBUG
          System.out.print("pb = " + pb + "\n\n"); // DEBUG
          img_enc.encode(rop);The result:
rop = PlanarImage[minX=0 minY=0 width=0 height=0 tileGridXOffset=0 tileGridYOffs
et=0 tileWidth=0 tileHeight=0 sampleModel=null colorModel=null]
pb = java.awt.image.renderable.ParameterBlock@1b273ccAnd sure enough, it gives out an exception when trying to encode image.
Anyone know where I did wrong?
Thanks

Double check the settings for the camera.
For Windows 8: Start the Lenovo Settings program, originally Lenovo Settings can be found on the Start screen. Then click Camera. Follow the instructions on the screen to configure the camera settings as desired.
You may also find more information in the X230T User Guide.
Thank you for being a part of the Lenovo Family,
Catie
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Can't invert an image

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