File mode, write and binary. Since you are writing a .jpg file, it looks fine.
But if you supposed to read that jpg file you need to use
On Windows, 'b' appended to the mode opens the file in binary mode, so there are also modes like 'rb', 'wb', and 'r+b'. Python on Windows makes a distinction between text and binary files; the end-of-line characters in text files are automatically altered slightly when data is read or written. This behind-the-scenes modification to file data is fine for ASCII text files, but it’ll corrupt binary data like that in JPEG or EXE files.
wb indicates that the file is opened for writing in binary mode.
On Unix systems (Linux, Mac OS X, etc.), binary mode does nothing - they treat text files the same way that any other files are treated. On Windows, however, text files are written with slightly modified line endings. This causes a serious problem when dealing with actual binary files, like
jpg files. Therefore, when opening files which are not supposed to be text, even in Unix, you should use
rb. Use plain
r only for text files.