ASCII images take up less space but are significantly less readable than
proper images.

Signed-off-by: Stephen Finucane <step...@that.guru>
---
 .../internals/contributing/documentation-style.rst        | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Documentation/internals/contributing/documentation-style.rst 
b/Documentation/internals/contributing/documentation-style.rst
index 3c04b86..b1b7e41 100644
--- a/Documentation/internals/contributing/documentation-style.rst
+++ b/Documentation/internals/contributing/documentation-style.rst
@@ -247,13 +247,22 @@ Cross-referencing
       Here is a cross-reference to :ref:`sample-crossref`.
 
   .. note::
-    This is a Sphinx extension. Do not use this in any top-level documents.
+
+     This is a Sphinx extension. Do not use this in any top-level documents.
 
 Figures and Other Media
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-- All images should be in ASCII format and included in code-blocks to preserve
-  formatting.
+- All images should be in PNG format and compressed where possible. For PNG
+  files, use OptiPNG and AdvanceCOMP's ``advpng``:
+
+  .. code-block:: shell
+
+     $ optipng -o7 -zm1-9 -i0 -strip all <path_to_png>
+     $ advpng -z4 <path_to_png>
+
+- Any ASCII text "images" should be included in code-blocks to preserve
+  formatting
 
 - Include other reStructuredText verbatim in a current document
 
-- 
2.9.3

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