photoshop web background colour

@louisev1992769  Yes it’s a good idea to have a non black neutral background, for print work and you can, I like the area around the image frame to be near white, I use Lab colour values for this in the color picker - L=95, a=0, b=0 - it gives a more realistic view on print output. 

To set the image surround area, as below in my example (where it is near white) - right click in the area with your mouse - (I mean the area around but outside an image, but inside it's frame). Now either select from the listed options which include 3 grays or use the color picker to set the colour / tone you want . You could set it to L 50, a 0, b 0 if you wanted a middle gray - (a lower L value is darker. Higher values get lighter).

a=0 b=0 is always gray so Lab is easier here, just one number to set 

see screenshots below

If you want the whole Photoshop interface background to be gray  - then go to: settings > Interface and select a gray there for Color Theme

I hope this helps

neil barstow colourmanagement - adobe forum volunteer,

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RGB 125/125/125 in which Color Space anyway? 

And this won't do?