Context: The CIPA DC-004 standard requires that Japanese manufacturers of digital still cameras use either the REI or SOS techniques, and DC-008 updates the Exif specification to differentiate between these values. Consequently, the three EI techniques carried over from ISO 12232:1998 are not widely used in recent camera models (approximately 2007 and later). As those earlier techniques did not allow for measurement from images produced with lossy compression, they cannot be used at all on cameras that produce images only in JPEG format.

Question: Which methods are required by CIPA DC-004?
Answer: REI or SOS techniques

Question: In what year did the three EI techniques from ISO 12232:1998 largely stop being used?
Answer: approximately 2007 and later

Question: With what cameras can earlier techniques not be used?
Answer: cameras that produce images only in JPEG format

Question: What nation's cameras does the CIPA DC-004 apply to?
Answer: Japanese

Question: What does the DC-008 change?
Answer: the Exif specification

Question: How many techniques are widely used in new camera models?
Answer: Unanswerable

Question: When was the CIPA DC-004 standard released?
Answer: Unanswerable

Question: Which manufacturers are exempt from CIPA DC-004?
Answer: Unanswerable

Question: After 2007, newer camera models started using what techniques again?
Answer: Unanswerable

Question: The three EI techniques have to be used on cameras that only capture in what format?
Answer: Unanswerable