Saturated red channel on RGB image, makes imread() return logical (bug #41584) * libinterp/dldfcn/__magick_read__.cc (get_depth): this function tries to second guess GM when reporting the actual bitdepth of an image in the file (see comments for full discussion). We assumed we could check only red from RGB but if the channel was saturated, it would return depth of 1, so we really need to check all 3 channels. Unfortunately, 3 saturated channels may still lead to images incorrectly read as logical. * scripts/image/imread.m: add test for this bug.

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