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This simple script illustrates drawing an image on a canvas and overdrawing with text.
from reportlab.lib.utils import ImageReader
from reportlab.pdfgen.canvas import Canvas
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfbase.pdfmetrics import registerFont
from reportlab.lib.pagesizes import A4
canv = Canvas('text-on-image.pdf',pagesize=A4)
img = ImageReader('pythonpowered.gif')
#now begin the work
x = 113
y = 217
w = 103
h = 119
canv.setFillColor((1,0,0)) #change the text color