ArcMap 10.3 reads pyramids as present for JPEG images when no pyramids exist.
Last Published: April 7, 2016ArcGIS for Desktop
Bug ID Number
January 21, 2016
March 30, 2022
ArcGIS for Desktop
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
JPEG JFIF/JPEG2000 is implemented such that it can be decoded at various resolution. The image will always contain internal overviews based on different scale factors for this. That is why ArcGIS displays the pyramid layers for these images even when we delete them.