rmagic旋转和背景色为黑色

Question

img1 = Magick::Image.read("public/123.png").first 
img1.background_color = "none" 

img1.rotate!(30) 
img1.write('test.png') 

背景色为黑色，透明程度

任何人，帮助吗？

Answer 1

img1 = Magick::Image.read("public/123.png").first 
img1.background_color = "transparent" 

img1.rotate!(30) 
img1.write('test.png')