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2 problems here:

1. "The function does not work with multi-channel arrays" see docs, again ! so you need to imread() it as grayscale: img1 = imread("DCIM_20171025_1.JPG", IMREAD_GRAYSCALE);

2. careful with printf ! for doubles, you need %f not %d, so: printf("MAX= %f, MIN= %f", maxVal, minVal);