add notice in size of style images

StyleText/README.md

@@ -72,7 +72,10 @@ fusion_generator:
 python3 -m tools.synth_image -c configs/config.yml --style_image examples/style_images/2.jpg --text_corpus PaddleOCR --language en
 ```
 
-* Note: The language options is correspond to the corpus. Currently, the tool only supports English, Simplified Chinese and Korean.
+* Note 1: The language options is correspond to the corpus. Currently, the tool only supports English, Simplified Chinese and Korean.
+* Note 2: Synth-Text is mainly used to generate images for OCR recognition models. 
+  So the height of style images should be around 32 pixels. Images in other sizes may behave poorly.
+
 
 For example, enter the following image and corpus `PaddleOCR`.
 

StyleText/README_ch.md

@@ -63,7 +63,10 @@ fusion_generator:
 ```python
 python3 -m tools.synth_image -c configs/config.yml --style_image examples/style_images/2.jpg --text_corpus PaddleOCR --language en
 ```
-* 注意：语言选项和语料相对应，目前该工具只支持英文、简体中文和韩语。
+* 注1：语言选项和语料相对应，目前该工具只支持英文、简体中文和韩语。
+* 注2：Style-Text生成的数据主要应用于OCR识别场景。基于当前PaddleOCR识别模型的设计，我们主要支持高度在32左右的风格图像。
+  如果输入图像尺寸相差过多，效果可能不佳。
+
 
 例如，输入如下图片和语料"PaddleOCR":