How to transfer photos from OS X Tiger to iPad iOS 7
No easy way no. 

G4 with 10.4 means a (very) old iTunes version (9.2.1). For iTunes 10 you need a least Leopard. 

To sync with iOS7 (the default OS of the iPad Air) you'll need iTunes 11.1.  

Other options : 


Use a another (more recent) mac to do it 
send the images with an app or mail (veeeeeery long)