PaulS:
if content is being generated on the fly
You seem to think that the Arduino is capable of generating image data on the fly. Psst, I've got news for you.
a) the example from the OP is generating binary content on the fly
b) I have an optical flowsensor right here that generates image data on the fly (albeit only 32x32 greyscale)
c) is it really so hard to say "didn't know that, guess I was wrong, thanks"?