code: @Override
      public void init() {
  
          if (CmsImageLoader.isEnabled()) {
              try {
                  //reads the optional parameters for the gallery from the XML configuration
                  I_CmsResourceType type = OpenCms.getResourceManager().getResourceType(GALLERYTYPE_NAME);
                  if (type instanceof CmsResourceTypeFolderExtended) {
                      m_galleryTypeParams = ((CmsResourceTypeFolderExtended)type).getFolderClassParams();
                  } else {
                      m_galleryTypeParams = null;
                  }
              } catch (CmsLoaderException e) {
                  if (LOG.isErrorEnabled()) {
                      LOG.error(e.getLocalizedMessage(), e);
                  }
              }
              m_defaultScaleParams = new CmsImageScaler(m_galleryTypeParams);
              if (!m_defaultScaleParams.isValid()) {
                  // no valid parameters have been provided, use defaults
                  m_defaultScaleParams.setType(0);
                  m_defaultScaleParams.setPosition(0);
                  m_defaultScaleParams.setWidth(120);
                  m_defaultScaleParams.setHeight(90);
                  m_defaultScaleParams.setColor(new Color(221, 221, 221));
              }
          } else {
              m_defaultScaleParams = null;
          }
      }
docs: Initializes the default image scaling parameters for the gallery preview.<p>
  
  @see org.opencms.workplace.galleries.A_CmsAjaxGallery#init()