putText antialiasing doesn't work with float images

[rggjan]

In python, using:

cv2.putText(frame, text, org, font_face, font_scale, color, lineType=cv2.LINE_AA)

doesn't produce antialiased text when frame is of type np.float32.

Changing it to:

frame = (frame*255).astype(np.uint8)
cv2.putText(frame, text, org, font_face, font_scale, color, lineType=cv2.LINE_AA)

and using

color=(255, 255, 255) instead of color=(1, 1, 1)

then nicely antialiases the text...

This is with opencv-python-headless=4.4.0.42