Why No Apple Pro Photo App?

For some creative software categories, Apple has three levels:

• iLife
• Express
• Pro

For example, there are the triples:

• video: iMovie / Final Cut Express / Final Cut Pro
• music: GarageBand / Logic Express / Logic Pro

Sometimes the express level is missing:

• dvd: iDVD / - / DVD Studio Pro

It has long struck me as at least interesting that Apple doesn't have any more in the photo editing series:

• photo: iPhoto / - / (Photoshop competitor)

There's nothing competing with Photoshop.

Actually, there's nothing competing with anything in Adobe's Creative Suite (which I just bought, incidentally):

• graphics: - / - / (Illustrator competitor)
• print: iPages / - / (InDesign competitor)

What am I missing about either the Adobe-Apple relationship or the market for photo/graphics/print versus video/music?

UPDATE (2005-10-19): Now see Aperture