[Python] Create A4 size PDF from image by using reportlab

I want to convert an A4 scanned image to PDF by using reportlab in python. I wrote bellow code but I get error. How can I fix it ?

from reportlab.lib.pagesizes import A4
from reportlab.lib.units import mm
height, width = A4
doc = SimpleDocTemplate("image.pdf", pagesize=A4)
parts = []
parts.append(Image("image.jpg",width=210*mm, height= 293*mm))
doc.build(parts)


reportlab.platypus.doctemplate.LayoutError: Flowable (595.275590551 x 830.551181102) too large on page 2 in frame 'normal'(439.275590551 x 685.88976378*) of template 'Later'

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