diff --git a/README.md b/README.md
index f45f2d1..ecfd327 100644
--- a/README.md
+++ b/README.md
@@ -140,8 +140,8 @@ type Converter interface {
 
 ## Sample outputs
 
-| Raw Image                                                                                     | ASCII Image                                                                                              |
-|:---------------------------------------------------------------------------------------------:|:--------------------------------------------------------------------------------------------------------:|
+| Raw Image                                                                                     | ASCII Image (optimized for display sizes)                                                              |
+|:---------------------------------------------------------------------------------------------:|:------------------------------------------------------------------------------------------------------:|
 | ![](https://raw.githubusercontent.com/qeesung/image2ascii/master/docs/images/lufei.jpg)      | ![](https://raw.githubusercontent.com/qeesung/image2ascii/master/docs/images/lufei_ascii.png)           |
 | ![](https://raw.githubusercontent.com/qeesung/image2ascii/master/docs/images/lufei.jpg)      | ![](https://raw.githubusercontent.com/qeesung/image2ascii/master/docs/images/lufei_ascii_colored.png)   |
 | ![](https://raw.githubusercontent.com/qeesung/image2ascii/master/docs/images/pikaqiu.jpeg)   | ![](https://raw.githubusercontent.com/qeesung/image2ascii/master/docs/images/pikaqiu_ascii.png)         |
diff --git a/docs/images/baozou.gif b/docs/images/baozou.gif
index bad832a..605ecab 100644
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diff --git a/docs/images/baozou_ascii.png b/docs/images/baozou_ascii.png
index 681cfb1..48ac593 100644
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diff --git a/docs/images/baozou_ascii_colored.png b/docs/images/baozou_ascii_colored.png
index 5ed8a45..507228f 100644
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diff --git a/docs/images/demo.gif b/docs/images/demo.gif
index b093273..d76ff33 100644
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diff --git a/docs/images/long.gif b/docs/images/long.gif
index 853f6f4..7b69cc6 100644
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diff --git a/docs/images/lufei.gif b/docs/images/lufei.gif
index 7ce1a86..9306dd0 100644
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diff --git a/docs/images/lufei_ascii.png b/docs/images/lufei_ascii.png
index 8c460b4..2b08273 100644
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diff --git a/docs/images/lufei_ascii_colored.png b/docs/images/lufei_ascii_colored.png
index 0958e39..4a5c054 100644
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diff --git a/docs/images/pikaqiu.gif b/docs/images/pikaqiu.gif
index f0917df..558abc6 100644
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diff --git a/docs/images/pikaqiu_ascii.png b/docs/images/pikaqiu_ascii.png
index 5f7f5dd..0d70ab0 100644
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diff --git a/docs/images/pikaqiu_ascii_colored.png b/docs/images/pikaqiu_ascii_colored.png
index 4e63a18..14b60d3 100644
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diff --git a/docs/images/pikaqiu_s.gif b/docs/images/pikaqiu_s.gif
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