CD Extended Graphics (CD+EG, CD-EG, CDエクステンディド・グラフィックス) is an extension to the CD Graphics (CD+G) standard. The extended commands allow for more colorful images and advanced transitions. Like CD+G, CD+EG occupies otherwise unused subchannel space on a CD Audio disc, so it has the same audio capacity as a normal CD, and the audio can be played in any CD player.
After the first few discs published in 1991 and 1992, CD+EG was rarely produced. I've only found evidence for a total of 8 or 9 releases up to 1996, and half are promotional. All of the confirmed discs were made by Victor (JVC).
I got involved with collecting CD+EG in July 2024, when I ran across a copy of The CD Graphics World by Extended Graphics. I set up this page to showcase my collection, and to organize information about this rare format. Please contact me with any info you'd like to share.
千住真理子・四季・ヴィヴァルディ:ヴァイオリン協奏曲集
アマデウス・オリジナル・サウンドトラック盤
魔神英雄伝ワタル３ オフヴォイス・コレクション ～特別編 君は救世主ワタルだ！
These are known or suspected CD+EG discs not in my collection.
It seems like the only difference from PGCD-5 is one of the karaoke tracks: Track 5 changed from いとしのエリー (Ellie My Love) on PGCD-4 to Say Yes on PGCD-5.
Seen sold on Yahoo Japan Auctions: listing (archived, front, back)
There are at least two more of these besides Feb.~Mar. 1995:
Seen sold twice on Mercari: listing 1 (archived, front, back, disc), listing 2 (front, back, disc)
Seen in an old Yahoo Japan Auctions listing saved on Aucfan: listing (archived, front, back, disc)
There is a 1992 bingo game from Hanayama called Rap de Bingo (ラップdeビンゴ) which includes a disc with the Extended Graphics logo. It's possible this is just a mislabeled CD+G. Barcode: 4972825192726. Seen sold on Mercari (listing, archived, box front, contents, box back, disc) and an old YJA listing saved on Aucfan (listing, archived).
CD+EG adds an extra video buffer, doubling the video memory from CD+G. This can be used for full 8 bit (256 color) graphics, or the two buffers can be used for independent 4 bit (16 color) images. When used independently, one buffer can written while the other is displaying, then they can be instantly switched. There is also a mode that allows the two buffers to be blended together, this can produce a dissolve effect, or one layer can be scrolled on a stationary background.
TODO: I intend to add more info such as: graphical techniques used on the different discs, compatibility of hardware CD+EG players, the obscure Line Graphics mode, more non-karaoke uses of CD+G, and how to accurately rip CD+G discs.
