  We describe the processing of the 531 billion raw data samples from the High
Frequency Instrument (hereafter HFI), which we performed to produce six
temperature maps from the first 473 days of Planck-HFI survey data. These maps
provide an accurate rendition of the sky emission at 100, 143, 217, 353, 545,
and 857 GHz with an angular resolution ranging from 9.7 to 4.6 arcmin. The
detector noise per (effective) beam solid angle is respectively, 10, 6, 12 and
39 microKelvin in HFI four lowest frequency channel (100--353 GHz) and 13 and
14 kJy/sr for the 545 and 857 GHz channels. Using the 143 GHz channel as a
reference, these two high frequency channels are intercalibrated within 5% and
the 353 GHz relative calibration is at the percent level. The 100 and 217 GHz
channels, which together with the 143 GHz channel determine the high-multipole
part of the CMB power spectrum (50 < l <2500), are intercalibrated at better
than 0.2 %.
