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Color correctionEvery MCU has a certain assigned value of DC channel coefficients that define the gamma of colors in that MCU. To increase compression rate, the JPEG stream does not store absolute values of these coefficients, but only the difference between the coefficient of the current MCU and the previous one. When an MCU gets damaged, calculating DC coefficients of the subsequent MCUs becomes impossible, because the reference DC values are now not available. As a result, the colors of the JPEG image after the damaged part become incorrect. To recover correct color of the image you can use the automatic color correction, or manually recover colors. |