diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ KCC's main goal is maximum image quality at significantly smaller file size. For
 
 3) fixes [the rainbow effect on Kaleido 3 color eink](https://www.youtube.com/watch?v=Dw2HTJCGMhw) without blur:
 
-![rainbow](images/rainbow3.jpeg)
+![rainbow](images/rainbow720.jpeg)
 
 4) can [semi-automatically detect 2-page spreads](https://www.youtube.com/watch?v=kfIX67f7Aqk) from pre-split single pages:
 
diff --git a/images/rainbow720.jpeg b/images/rainbow720.jpeg
new file mode 100644
index 00000000..24f5286c
Binary files /dev/null and b/images/rainbow720.jpeg differ