Aspects of the subject technology relate to systems and methods for identifying a mud angle associated with an electromagnetic imager tool based on variations in mud effect removed quantities of tool measurements made by the electromagnetic imager tool. Tool measurements made through one or more measurement units of an electromagnetic imager tool can be received. The one or more measurement units can have azimuthal sensitivity and the electromagnetic imager tool can operate to log a wellbore in a formation in making the measurements. One or more mud effect removal techniques can be applied to the tool measurements across a plurality of mud angle estimates to generate mud effect removed quantities for the one or more measurement units across the plurality of mud angle estimates. A mud angle associated with the electromagnetic imager tool can be identified from the plurality of mud angle estimates based on an amount of variation between the mud effect removed quantities across the one or more measurement units for each of the plurality of mud angle estimates.