Update README.md

README.md

@@ -17,10 +17,11 @@ The character should occupy a large proportion of the image. There should not be
 4. Reflections or shadows should not be included.
 
 ### Image Format
-Acceptable formats are jpg, jpeg, and png (not transparent). Do not use webp or transparent png.
+1. Acceptable formats are .jpg, .jpeg, and .png (not transparent). 
+2. Do not use webp or transparent png.
 
 ### Image Resolution
-The image resolution should be as high as possible, greater than (512, 1024) is ideal (use Gigapixel AI for upscaling if necessary). The higher the resolution, the higher the parameter settings and computational power required.
+The image resolution should be as high as possible, greater than (512, 1024) is ideal (use [Gigapixel AI](https://www.topazlabs.com/gigapixel-ai-it-really-works) for upscaling if necessary). The higher the resolution, the higher the parameter settings and computational power required.
 
 ### Image Quantity
 1. The number of images to be extracted for each character: >=20, ideally 16-20 (usually 5 or 10 images are sufficient). More is not necessarily better, choose the optimal number.