The listed technologies are encoding formats, but they are not file formats. I don't see a reason to talk about DCTs here; there is a DCT in JPEG, but it is not the only thing in JPEG. JPEG is not a type of DCT.
'''Exchangeable image file format''' (officially '''Exif''', according to JEIDA/JEITA/CIPA specifications) is a standard that specifies the [[file format|formats]] for [[image]]s, [[sound]], and ancillary tags used by [[digital camera]]s (including [[smartphone]]s), [[Image scanner|scanners]] and other systems handling image and sound files recorded by digital cameras. The specification uses the following existing fileencoding formats with the addition of specific [[Metadata (computing)|metadata]] tags: [[JPEG]] [[discretelossy cosine transform]] (DCT)<ref>{{Citation |first1=N. |last1=Ahmed |author1-link=N. Ahmed |first2=T. |last2=Natarajan |first3=K. R. |last3=Rao |title=Discrete Cosine Transform |journal=IEEE Transactions on Computers |date=January 1974 |volume=C-23 |issue=1 |pages=90–93 |doi=10.1109/T-C.1974.223784}}</ref>coding for compressed image files, [[Tagged Image File Format|TIFF]] Rev. 6.0 ([[RGB color model|RGB]] or [[YCbCr]]) for uncompressed image files, and [[Resource Interchange File Format|RIFF]] [[WAV]] for audio files (Linearlinear [[Pulse-code modulation|PCM]] or ITU-T [[G.711]] μ-Lawlaw PCM for uncompressed audio data, and [[Interactive Multimedia Association|IMA]]-[[ADPCM]] for compressed audio data).<ref>{{cite web |url=http://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf |title=Standard of the Camera & Imaging Products Association, CIPA DC-008-Translation-2012, Exchangeable image file format for digital still cameras: Exif Version 2.3 |access-date=2014-04-08 }}</ref> It isdoes not used insupport [[JPEG 2000]] or [[GIF]] encoded images.
This standard consists of the Exif image file specification and the Exif audio file specification.
