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This paper proposes the image Helmholtz equation method to visualize iron loss distribution of magnetic materials. The Helmholtz-type equations carry out dynamic image analysis of a series of distinct magnetized domain images. The domain images derive the state transition matrices of which imaginary parts correspond to the phase lag components of magnetization. In the present paper, iron loss distribution of a grain-oriented electrical steel is studied by utilizing its scanning electron microscope (SEM) images. The result of analysis visualizes iron loss generating parts reflecting on the magnetic domains. Moreover, the solution of image Helmholtz equation demonstrates computing magnetization curves, which agree well with the experimental result.