Digital Light & Color

Probing a color from the source image (or some other) to make it also the frame color results in a more saturated frame color in both the Mat & Frame window and the output image.
a. open the Mat and Frame transformation
b. go to Frame tab, click on Color/Image to open the Frame color picker
c. use the probe of the Frame color picker to pick a color form the source image
d. click Apply or OK

Readout values of the resulting tif (not the attached jpeg):
the upper part of the image = the probed source color: HSV 54.1/45.7/31.8
the lower part of the image = the resulting frame color: HSV 52.6/81.3/31.4
There is some difference in Hue and a big difference in saturation.

Is the Frame under any special light conditions?
I have not checked the probes of the other tabs of Mat & Frame transformation.

David

P.S.
It is interesting how the colors of the attached jpeg image are different again from the original tif image due to both the conversion and the web browser.

The frame color is made lighter or darker by adjusting its brightness in the HSL color space, not HSV - this can lead to big differences in HSV saturation as the brightness varies. HSL is used so that the bright areas tend toward white which is more like what happens with reflections from a frame.