PAN photo and signature scans
Protean (NSDL) scan guidance uses specific cm sizes at 200 DPI. ExamPhoto maps these to whole-pixel crops — confirm on the portal.
Photo
Working crop about 197×276 px, up to 20 KB. Plain background, face forward.
Signature
Working crop about 354×157 px, up to 10 KB. Sign on white paper and crop close to the ink.