Canon Inc. says that the embedded image is primarily intended to speed up the display on the camera during review, especially when using the magnified playback feature. Sorry, that's as much as they were willing to say.
White Balance so easy, even our 5 year old can do it.- Melissa Strickland
Just a comment on that purpose, I'd rather have the extra space for additional pictures. I'm always running out of CF space but seldom use the preview/zoom feature.
Think it may be worth considering using the full size jpg for zoom, and not embedding a 2nd of medium size.
White Balance so easy, even our 5 year old can do it.- Melissa Strickland
Both cameras, 10D and the Digital Rebel, always embed a JPEG inside their RAW files. With the 10D, the size and compression of the embedded JPEG is adjustable by the user via Custom Function control. With the Digital Rebel, the size and compression of the embedded JPEG is fixed at "Medium/Fine," in other words 2048 x 1360 pixels with relatively low compression. There is no extra 1536 x 1024 JPEG in addition to the embedded JPEG mentioned above.
White Balance so easy, even our 5 year old can do it.- Melissa Strickland