the one on left is correct , other one in unity3d.
Actually i have not change anything about light or graphic
images change after drag and drop to unity3d
Is unity3d only accept some brightness value???
Have you tried a different filter mode?
No ,already i think it is not about after import.
Is your art package doing some sort of colour management/correction?
it is impossible because i haven’t learn colour correction on unity3d
Colour management is probably the correct guess here; choose Edit → Colour Settings in Photoshop and switch to settings for Monitor Colour for a close representation of how the image will look inside Unity.
and this color change is not on scene or gameplay . it is happens after drag image to unity3d and I can see change of image in project
It’s not Unity making the image darker, it’s Photoshop making the image brighter if you’re using default settings.
- Change Edit → Colour Settings to Monitor Colour in Photoshop
- Adjust image brightness to how you want it to look
- Drag image to Unity3D
- Observe correct brightness
If using some other editing program, just make sure the program works in Monitor RGB / sRGB mode.
I’m using krita
I found article about color in krita but dont know what does unity3d use color settings??
https://userbase.kde.org/Krita/Manual/ColorManagement/ProfilingandCalibration
I would experiment with the settings on this dialog page. Basically, Krita will use colour management profiles throughout the process and will embed them in any files you save/export, while Unity will ignore such profiles and the image will appear darker. When you change the settings to work in RGB (or monitor colour, i.e. how things are displayed without colour management) things should appear the same brightness in both programs.
Thanks , I switched to assume monitor profile and enabled embed in sRGB when save . Now it is correct
Cheers, glad to help. 
We had a similar issue with our game using Photoshop, in that one the default behaviour ends up making things brighter than you expect and we spent a few hours looking at ambient light and shaders instead.
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