The invention relates to a method for automatically distinguish whether a pixel of a with the aid of a magnetic resonance system (1) recorded mr - image to a fat dominated or to a water is dominated fabric. The method comprises a detecting of only of a spin echo based magnet resonance signal (16) per image point to a point in time at which a phase of the magnetic resonance signal of a water-containing fabric an opposite phase to a phase of a magnetic resonance signal of a fat-containing tissue. The method further includes a calculating a phase angle of the pixel, a determining a by means of the magnetic resonance system (1) base phase caused to the image point and determining a corrected phase angle of the pixel from the phase angle and the base phase. On the basis of the corrected phase angle is then determined whether the pixel to be a fat dominated or to a water is dominated fabric.
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