diff --git a/ChangeLog b/ChangeLog
index 92cbb527..5a653d13 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -23631,3 +23631,7 @@
 	* Updated the build package list for Ubuintu 22.04 in 'INSTALL'.
 2022-11-07 Fred Gleason <fredg@paravelsystems.com>
 	* Fixed a regression that broke the 'make deb' target.
+2022-11-09 Fred Gleason <fredg@paravelsystems.com>
+	* Added a file format check to the 'Image Manager' dialog in
+	rdadmin(1) to ensure that only JPEG or PNG formatted image files can
+	be imported.
diff --git a/lib/rdconf.cpp b/lib/rdconf.cpp
index b17dbc0d..06b498a1 100644
--- a/lib/rdconf.cpp
+++ b/lib/rdconf.cpp
@@ -30,6 +30,8 @@
 #include <time.h>
 
 #include <QDir>
+#include <QProcess>
+#include <QStringList>
 
 #include <rdapplication.h>
 
@@ -1122,3 +1124,28 @@ int RDCheckReturnCode(const QString &msg,int code,int ok_value)
   }
   return code;
 }
+
+
+QString RDMimeType(const QString &filename,bool *ok)
+{
+  QStringList args;
+  QString ret;
+
+  args.push_back("--mime-type");
+  args.push_back(filename);
+  QProcess *proc=new QProcess();
+  proc->start("/usr/bin/file",args);
+  proc->waitForFinished();
+  if((proc->exitStatus()!=QProcess::NormalExit)||(proc->exitCode()!=0)) {
+    *ok=false;
+    delete proc;
+    return ret;
+  }
+  *ok=true;
+  ret=QString(proc->readAllStandardOutput()).
+    split(":",QString::SkipEmptyParts).last().trimmed();
+
+  delete proc;
+
+  return ret;
+}
diff --git a/lib/rdconf.h b/lib/rdconf.h
index d8e3aaf4..535487ec 100644
--- a/lib/rdconf.h
+++ b/lib/rdconf.h
@@ -111,6 +111,7 @@ QList<pid_t> RDGetPids(const QString &program);
 int RDCheckExitCode(const QString &msg,int exit_code);
 int RDCheckExitCode(RDConfig *config,const QString &msg,int exit_code);
 int RDCheckReturnCode(const QString &msg,int code,int ok_value);
+QString RDMimeType(const QString &filename,bool *ok);
 
 
 #endif   // RDCONF_H
diff --git a/lib/rdfeed.cpp b/lib/rdfeed.cpp
index cacb57f8..a0a017aa 100644
--- a/lib/rdfeed.cpp
+++ b/lib/rdfeed.cpp
@@ -713,6 +713,19 @@ int RDFeed::importImageFile(const QString &pathname,QString *err_msg,
   QSize max=rda->rssSchemas()->maximumImageSize(rssSchema());
   *err_msg="OK";
 
+  //
+  // Check the file type
+  //
+  QString mimetype=RDMimeType(pathname,&ok);
+  if(!ok) {
+    *err_msg=tr("Error validating image file.");
+    return -1;
+  }
+  if((mimetype!="image/jpeg")&&(mimetype!="image/png")) {
+    *err_msg=tr("Unsupported image file format.");
+    return -1;
+  }
+
   //
   // Load the image
   //