I am doing the same thing, working in 1280 x 720 HD. I have Final Cut Pro 5 (somewhat old). I also needed QuickTime 7 Pro, but installing QuickTime 7 (non-pro) and Final Cut Pro upgraded QuickTime 7 to Pro.
Here is what I have been doing.
(1) Have the stills with consecutively numbered file names, like picture0000.tiff, picture0001.tiff, etc. I was able to make the images at a size of 1280 x 720.
(2) Open QuickTime7 (which turned up in the Utilities subfolder of Applications under the name “QuickTime Player 7.app”).
(3) Select File -> Open Image Sequence, and select the first image of your sequence. This actually brings in the whole sequence.
(4) It may take a while to load the images. The playback from inside QuickTime 7 was terrible on my machine, but that’s OK.
(5) Select File ->Export. I chose “Movie to QuickTime Movie”, and then there are a lot of options. I chose 720p24, which is what I had for my Final Cut Pro project.
(6) Import the resulting movie into Final Cut Pro, and it behaves like any other clip.
QuickTime 7 may have a limit of 5000 image file in a single sequence, but none of my sequences are that long.
For the experts out there: Is there a better way to do it? I have Final Cut 5 – have things changed in Final Cut 7? Is it still necessary to go via QuickTime 7?
Cheers,
Gordon Monro