[rmagick]Magick::Image.readじゃStringIOは読めないのか。 "The read method does not accept a StringIO object. If you want to create an image from a string buffer, use from_blob." RMagick 2.12.0: class Image (class methods and instance methods a-d)
[rmagick]Magick::Image.from_blob(string) creates an array of images from a BLOB, that is, a Binary Large OBject. In RMagick, a BLOB is a string. / RMagick 2.12.0: class Image (class methods and instance methods a-d)
