ALMA full disk images on December 17, 2015, compared with images at other wavelengths. Top row, left to right: ALMA image at 239 GHz; the same, degraded to the 100 GHz resolution; and ALMA image at 100 GHz. Bottom row: Hα from the GONG network; 1600 Å image from AIA/SDO; and magnetogram from HMI/SDO. The images have been partly corrected for center-to-limb variation. ALMA images are shown with the same contrast.