[Xmlgraphics-fop Wiki] Update of "HowTo/ImageLoaderRawPNG" by LuisBernardo

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The "HowTo/ImageLoaderRawPNG" page has been changed by LuisBernardo:
https://wiki.apache.org/xmlgraphics-fop/HowTo/ImageLoaderRawPNG?action=diff&rev1=3&rev2=4

Comment:
removed line that disabled default image loader, to avoid confusing users

    <image-loading>
      <penalty value="-10000" class="org.apache.xmlgraphics.image.loader.impl.ImageLoaderRawPNG" />
      <penalty value="INFINITE" class="org.apache.xmlgraphics.image.loader.impl.ImageLoaderPNG" />
-     <penalty value="INFINITE" class="org.apache.xmlgraphics.image.loader.impl.imageio.ImageLoaderImageIO" />
    </image-loading>
    <renderers>
      <renderer mime="application/pdf">
@@ -21, +20 @@

      </renderer>
    </renderers>
  }}}
- Note that in the above example the ImageLoaderPNG and the ImageLoaderImageIO image loaders were disabled. The penalty of -10000 (reverse penalty) compensates the default penalty of 1000, and makes the ImageLoaderRawPNG image loader the preferred one.
+ Note that in the above example the ImageLoaderPNG image loader has been disabled. The penalty of -10000 (reverse penalty) compensates the default penalty of 1000, and makes the ImageLoaderRawPNG image loader the preferred one (the default image loader, org.apache.xmlgraphics.image.loader.impl.imageio.ImageLoaderImageIO, has no intrinsic penalty).
  
- The ImageLoaderPNG image loader is similar to the ImageLoaderImageIO one, in the sense that it also decodes the IDAT chunk, but it does so using the org.apache.xmlgraphics.image.codec.png.PNGImageDecoder class instead of com.sun.imageio.plugins.png.PNGImageReader class.
+ The ImageLoaderPNG image loader is similar to the ImageLoaderImageIO one, in the sense that it also decodes the IDAT chunk, but it does so using the org.apache.xmlgraphics.image.codec.png.PNGImageDecoder class instead of com.sun.imageio.plugins.png.PNGImageReader class. In practical terms, it offers no advantages over the default ImageLoaderImageIO, except in situations where a JVM does not offer a PNG image reader.
  

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