Adjusting threshold without opening image window

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kt7
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Adjusting threshold without opening image window

kt7
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Whenever I run the following code I get an error that no windows are open. I know that i could rewrite as: IJ.open("path"+(i)+".jpg"); however i am trying t save the runtime from opening the windows for 900 images.
Thanks,
Kyle

for(int i=0; i<900; i++){
                        ImagePlus image1 =IJ.openImage("path"+(i)+".jpg");
                        ij.setThreshold(threshold, 255,"Black & White");
}