7.1.5214 Dynamic module image format issue and GIF quality

This video explains it best.

a) Reduced gif has bad quality (I think we had that a while back)

b) using .png or .gif instead of .jpg breaks my funktionality of a module :-(

www.marktold.com/screencast/sf-jpg-gif-png-problem.swf

 <sf:DetailsViewHyperLink ID="DetailsViewHyperLink1"  runat="server" data-sf-field="ObjektName"  Tooltip='<%# Eval("ObjektName") %>'>  <img style="max-height:150px;" src='<%# MediaContentExtensions.ResolveThumbnailUrl(((MediaContent)Eval("Hauptbild")), "rm-cropped", true) %>' alt='<%# Eval("Hauptbild.AlternativeText")%>' title='<%# Eval("Hauptbild.Title") %>' class="rm-list-thumb"/></sf:DetailsViewHyperLink>

 Markus