scanning pixels of .tiff image using imageJ library

If you look at the documentation for getPixel(int,int) in ImagePlus you'll see that it returns an array of ints rather than a single int:

Returns the pixel value at (x,y) as a 4 element array. Grayscale values are retuned in the first element. RGB values are returned in the first 3 elements. For indexed color images, the RGB values are returned in the first 3 three elements and the index (0-255) is returned in the last.

It looks as if you're dealing with an RGB image, so you should be able to do the following instead:

int [] colorArray = image1.getPixel(x,y);

int redValue = colorArray[0];
int greenValue = colorArray[1];
int blueValue = colorArray[2];