A few questions.
1. Did you convert to sRGB and Embed the colour profile?
2.How are you viewing your saved jpeg file where you say it looks brighter ? Are you using a colour managed application?
The latter is especially important if you are using a wide gamut monitor. If the viewing application is not colour managed the sRGB image will display as over saturated.
Answers to your questions:
1.Did you convert to sRGB and Embed the color profile?
2. How are you viewing your saved jpeg file where you say it looks brighter ? Are you using a color managed application?
I am not the one viewing it I did not make that part of my problem clear. I email the jpg to a colleague who has Creative Cloud Photoshop on a Mac. His LCD is also color calibrated using color monki.
So is he viewing the same image in his version of Photoshop but it looks different to yours?
Are both monitors profiled?
If so have you tried a downloaded test image on both systems for comparison. There are some here:
Yes, but calibrated to what?
You need to set a white point brightness according to your work environment, so that monitor white is a close visual match to paper white. Your colleague needs to do the same. This is standard operating procedure for critical work.
Your perception is heavily influenced by the ambient conditions, right down to application interface, which is why it's impossible to give a fixed number. The general recommendation is often 120 cd/m², but that assumes "average" conditions, whatever that is.
Just get that visual match. You need to "see" paper white on screen.