An image forming apparatus that suppresses occurrence of color shift in images transferred from image bearing members onto an intermediate transfer member. The image processing apparatus analyzes a profile of image data along the extension of signal lines of the radiation image capturing apparatus, and identifies a range of the image data where a defect has occurred, whereby the image data in the identified range is corrected. The provider, may, in turn, send a request to a device-based transaction facilitation system to determine whether the identified customer wishes to participate in the requested transaction. The narrow-band transmission-type optical filter subsystem transmits substantially only the narrow band of wavelengths of visible illumination produced from the narrow-band illumination subsystem, and rejects all other optical wavelengths outside the narrow band however generated by ambient illumination sources. The extension unit is configured to electrically connect the output sources to a portion of the electrodes. The system may include multiple light emitting devices for providing visual aids to the golfer to assist the golfer in tracking at least one component of his golf swing.