title: What is the best web viewable format to save a TIF with a 1 bit depth?
body: <p>I want to convert <code>TIF</code> to an image type that is viewable in a web page.</p>
  
  <p>The <code>TIFs</code> are black and white so <code>JPG</code> does not work well at all and ends up even larger after conversion.</p>
  
  <p>Here are some tests I have performed using C# and <code>Image.Save</code> to do the conversion:</p>
  
  <p>Orignal <code>TIF</code> is 7KB (bit depth: 1).</p>
  
  <p>Converted to:</p>
  
  <ul>
  <li>JPG: 101KB (bit depth: 24)</li>
  <li>BMP: 256KB (bit depth: 1)</li>
  <li>GIF: 17KB (bit depth: 8)</li>
  <li>PNG: 11KB (bit depth: 1)</li>
  </ul>
  
  <p>I then converted a multipage <code>TIF</code> which has 3 pages.  Original size was 134KB (bit depth: 1).</p>
  
  <p>Converted 3 images totals:</p>
  
  <ul>
  <li>JPG: 1324KB (bit depth: 24)</li>
  <li>BMP: 768KB (bit depth: 1)</li>
  <li>GIF: 221KB (bit depth: 8)</li>
  <li>PNG: 155KB (bit depth: 1)</li>
  </ul>
  
  <p>I am starting with a multipage <code>TIF</code> and I need to convert to be viewable in a browser.  It looks like <code>PNG</code> would be the best format to use based on my basic tests I have outlined above.  Are there other image formats that I should be using / considering?</p>
  
  <p>Are the any other options I am missing to get the file size down?</p>
  
  <p><strong>EDIT:</strong> I haved added more information regarding the bit depth of each format.  The <code>BMP</code> and <code>PNG</code> maintain the same bit depth as the <code>TIF</code>.  Is there a way to reduce the <code>GIF</code> or <code>JPG</code> bit depth to hopefully reduce the size significantly?</p>