I was wondering if somebody could briefly explain to me what an ideal document size of a still to set in Photoshop for use in Final Cut Pro might be. I currently set still pixel dimensions to no larger than 2800 px (width or height). Is there a similar limit or range that the document size should be set to/within?
You should set your image so it's at least the same width as the video size you're working with. If you're working with SD footage then you'll want the image to be a maximum width of 720 non-square pixels. If you're working with HD footage then you'll want a maximum width of 1080 non-square pixels. If you want the image to be completely in frame without the black bars at the top and bottom then you'll want to set your height to the same height as your video.