When I press the Printscreen key and the paste into Photoshop, colors are quite different.
I tried to do this with a RGB colors document (8, 16 and 32 bits).
How can I ensure Print Screen will capture accurate color when pasted into Photoshop?
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If your system or your application uses colour management, the RGB values of colours are converted from their original colour profile to the installed colour profile of your monitor when the colours are shown on your monitor.
Typical print screen functions make a copy of the entire screen as it appears on your monitor; i.e., the colours get the converted RGB values that correspond to the installed colour profile of your monitor.
Therefore, if you paste the screenshot into a new Photoshop image, the numerical RGB values are the converted RGB values (not the original RGB values).
You can test whether this case applies to you:
Calibrate Your Display (monitor). How you do this depends on your operating system.
Adjust the Photoshop Color settings correctly if needed.
Edit > Color Settings) to
North American General Purpose 2will provide a good base setting for color profiles. You may wish to alter this though based upon your specific working environment.
Most likely you get overly inaccurate color when using PrintScreen and pasting into Photoshop because your display is not properly calibrated. A poorly calibrated display isn't accurately showing colors so Photoshop is just pasting in what the screen states is the color profile to use. If no profile is specified (uncalibrated display) then Photoshop guesses. And being a dumb computer, that guess isn't always correct.
In an image with no embedded color profile Photoshop "throws in" whatever is specified as your
working RGB profile in its color settings. If you calibrate the display, there will be an embedded color profile. In that instance Photoshop reads the numbers and converts those numbers to your "working RGB" profile setting.
Adding a profile to an image without one can often result in undesired color changes. Converting from an embedded profile to another profile yields far more accurate results.
You can setup color management this way
Edit -> Color Settings (Shift + Ctrl + k)
Color Management Policies set everything to
Off like below
RGB: Off CMYK: Off Gray: Off
by turning the color management Off this way, It Turns off color management for newly created documents and for newly opened documents that have embedded color profiles different from the current working space. Hope this helps thanks!
P.S: I have answered this question considering photoshop CS4. since you have not mentioned the version of photoshop you are using.