The color are different between texture and viewport.

I use the texture of “Color_checker_8bit” from Color Calibrator folder.
i found the color are different between texture and viewport(unlit mode).

In nuke ,the texture waveform like this:

I capture the color calibrator in viewport with Unlit mode,import to nuke,the waveform like this:

Why are they so different?How to set them to be the same?