Use different method for defining number_of_bytes_per_component.

src/general/image_utilities.cpp

@@ -11,7 +11,6 @@ Utilities for handling images.
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#include <algorithm>
 #include <math.h>
 #include <stddef.h>
 #include <stdlib.h>
@@ -5643,7 +5642,7 @@ Extracts parameters from <magick_image> that matter for a Cmgui_image
 				*number_of_components = 3;
 			}
 		}
-        *number_of_bytes_per_component = (magick_image->depth == 0) ? 0 : std::max(1, int(magick_image->depth/8));
+        *number_of_bytes_per_component = (magick_image->depth + 7) / 8;
 		DestroyExceptionInfo(magick_exception);
 		return_code = 1;
 	}