Map of differential reddening toward NGC 6397. The color levels in the map correspond to the relative variation in E(B–V), with the scale indicated on the right (left panel). The middle panel presents the I_E vs. I_E − Y_E CMD corrected for differential reddening. The right panel shows I_E plotted against the displacement (in Euclid VIS pixel units) relative to the average motion of NGC 6397. Probable cluster members are highlighted in black, while field stars are depicted in gray.