Gamma handling is different in Shake and Final Cut Pro:
Shake makes no automatic changes to the gamma of QuickTime or RGB image files and sequences. Users must make sure that their monitor is properly calibrated for their production environment, and that the ViewerLookup parameters are set to the values required for images to display properly in the Shake Viewer. In particular, the default viewerGamma value is 1, which leaves the gamma of images displayed in the Viewer unchanged.
Final Cut Pro, on the other hand, makes some assumptions about the gamma of QuickTime and RGB image files that are imported into a project. The gamma of imported QuickTime and RBG image files is treated differently in sequences set to render in 8-bit or 10-bit YUV.
Tip: While it is possible to recalibrate Apple displays via the Display Calibrator Assistant in Displays preferences, users should leave the gamma of their monitors to the 1.8 Standard Gamma setting when working in Final Cut Pro. ColorSync settings are not used by either Shake or Final Cut Pro for automatic color calibration or compensation of any kind.