diff --git a/src/slic3r/GUI/Auxiliary.cpp b/src/slic3r/GUI/Auxiliary.cpp
index c3ea3d703e..8115f1d724 100644
--- a/src/slic3r/GUI/Auxiliary.cpp
+++ b/src/slic3r/GUI/Auxiliary.cpp
@@ -378,14 +378,15 @@ void AuFile::on_set_cover()
     }
 
     bool result = true;
-    wxImage thumbnail_img;;
+    wxImage thumbnail_img;
+
     result = generate_image(m_file_path.string(), thumbnail_img, _3MF_COVER_SIZE);
     if (result) {
         auto cover_img_path = dir_path.string() + "/thumbnail_3mf.png";
         thumbnail_img.SaveFile(encode_path(cover_img_path.c_str()));
     }
 
-    result = generate_image(m_file_path.string(), thumbnail_img, PRINTER_THUMBNAIL_SMALL_SIZE, GERNERATE_IMAGE_CROP_VERTICAL);
+    result = generate_image(m_file_path.string(), thumbnail_img, PRINTER_THUMBNAIL_SMALL_SIZE);
     if (result) {
         auto small_img_path = dir_path.string() + "/thumbnail_small.png";
         thumbnail_img.SaveFile(encode_path(small_img_path.c_str()));
diff --git a/src/slic3r/GUI/GUI_Utils.cpp b/src/slic3r/GUI/GUI_Utils.cpp
index c2f6600d71..1c472f420d 100644
--- a/src/slic3r/GUI/GUI_Utils.cpp
+++ b/src/slic3r/GUI/GUI_Utils.cpp
@@ -450,7 +450,7 @@ bool generate_image(const std::string &filename, wxImage &image, wxSize img_size
     if (method == GERNERATE_IMAGE_RESIZE) {
         float h_factor   = img.GetHeight() / (float) image.GetHeight();
         float w_factor   = img.GetWidth() / (float) image.GetWidth();
-        float factor     = std::max(h_factor, w_factor);
+        float factor     = std::min(h_factor, w_factor);
         int   tar_height = (int) ((float) img.GetHeight() / factor);
         int   tar_width  = (int) ((float) img.GetWidth() / factor);
         img              = img.Rescale(tar_width, tar_height);
@@ -465,7 +465,7 @@ bool generate_image(const std::string &filename, wxImage &image, wxSize img_size
         return false;
     }
 
-    image.ConvertAlphaToMask(image.GetMaskRed(), image.GetMaskGreen(), image.GetMaskBlue());
+    //image.ConvertAlphaToMask(image.GetMaskRed(), image.GetMaskGreen(), image.GetMaskBlue());
     return true;
 }