https://github.com/ImageMagick/ImageMagick/pull/1326

diff --git a/MagickCore/property.c b/MagickCore/property.c
index a5d3f6684126f47b2987162b9c7387cd15e94d4c..2d746d0457e845aa7e4715e12578d0f1b7abbbb3 100644 (file)
--- a/MagickCore/property.c
+++ b/MagickCore/property.c
@@ -2870,6 +2870,7 @@ MagickExport const char *GetMagickProperty(ImageInfo *image_info,
         }
       if (LocaleCompare("colors",property) == 0)
         {
+          WarnNoImageReturn("\"%%[%s]\"",property);
           image->colors=GetNumberColors(image,(FILE *) NULL,exception);
           (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
             image->colors);