ASP.NET-VB - How to clear Gamma from Streamed .png images

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This is quite an annoying problem while Internet Explorer does not properly display colors of generated and streamed .png images. Below is quite simple code to produce a square rendered with #767676. IE displays completely wrong color, while other browsers do not.

I’ve read somewhere it is possible to remove gamma form the image for proper rendering in IE. But no idea how to properly do it… or if this at all possible. Anyone can help?

Thanks.

<%@ Import Namespace=System.Drawing %>
<%@ Import Namespace=System.Drawing.Imaging %>
<%@ Import Namespace=System %>
<%@ Import Namespace=System.Web %>
<%@ Import Namespace=System.Runtime.InteropServices %> 
<%@ Import Namespace=System  %>
<%@ Import Namespace=System.IO  %>
 
<%
 
    Dim MStream As New MemoryStream()
    Dim full_thumb As New Bitmap(200, 200)
    Dim gr_square As Graphics = Graphics.FromImage(full_thumb)
    gr_square.FillRectangle(New SolidBrush(Color.FromArgb(255, 118, 118, 118)), 0, 0, 200, 200)
    Response.ContentType = "image/png"
    full_thumb.Save(MStream, ImageFormat.Png)
    MStream.WriteTo(Response.OutputStream)
    full_thumb.Dispose()
%>