rotation - rmagic 旋转和背景颜色为黑色

Question

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

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

背景颜色是黑色的，透明度如何

任何人，帮助？

Answer 1

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

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