Exporting tiff to jpeg -> loss of light

hello,

 

since couple of days when export tiff files jpeg exported image looks darker. if reimport histogram evidently changed.

 

it looks messed in preferences didn't make changes (at least didn't purposely).

i upgraded 4.4 version after happened nothing changed.

 

what can do?

 

thanks help,

andrea

are working calibrated monitor? 

 

what colorspace exporting jpgs with?  normal see different histogram because there color conversion large internal colorspace of lr smaller export colorspace shouldn’t make darker, other black clipping.

 

what software judging darkness of images besides reimporting lr?

 

have or system update installed new video drivers, recently?

 

can post screen capture, using camera icon @ top of web-forum text-entry area, of x|y view side-by-side of tif , re-imported jpg show difference in brightness?

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