29 January 2015 Update: When using in conjunction with Full Frame Processing mode introduce in Nuke 8 and newer, I find the read speed should not be a concern unless you are dealing with really long shot duration (around 100 frames and more).
07 August 2014 Update: Another interesting finding I’ve encounter when working on my current project is that EXR with ZIP compression scrub faster than TGA albeit with tearing on the display. Still TGA is much faster when playing back sequentially on the viewer.
22 July 2014 Update: TLDR, I recommend PNG if you also need to key out the scene other than roto while high quality JPEG should suffice if you strictly roto only. The quickest file format to scrub still goes to TGA in my benchmark.
Image Sequence Scrubbing Speed Woes
My first introduction to Nuke is all about rotoscoping. Yup that’s way back in 2010 after a quick stint of rotoscoping training at Double Negative Singapore using their in-house roto tool.
One thing I noticed that their systems are optimized to work at 2k res and higher for the image sequence (although I’m not sure what file format they used since I’m a complete newbie to compositing at that time). Although I believe all featured film production at least work with minimum of 10-bit Cineon or DPX format since 8-bit format lacks the information for serious compositing/grading process.