Update js_image_arithmetics.markdown

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@ -27,7 +27,7 @@ src1.delete(); src2.delete(); dst.delete(); mask.delete();
Image Subtraction
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You can subtract two images by OpenCV function, cv.subtract(). res = img1 - img2. Both images should be of same depth and type.
You can subtract two images by OpenCV function, cv.subtract(). res = img1 - img2. Both images should be of same depth and type. Note that when used with RGBA images, the alpha channel is also subtracted.
For example, consider below sample:
@code{.js}