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i am working on this scene as shown in the attached picture, after i rendered it the colors became darker than what it appears in Blender, when i opened it on photoshop to give it a little brightness, the right three bottles become lighter than the left one, can any one help me please if there is any mistake in my scene. . thanks in advance.enter image description here

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  • $\begingroup$ I can't be sure. but think it may help if you edited your question to include the file format you stored your rendered image in, your Scene > Color Management settings, and what you did in Photoshop to 'add brightness'. The left bottle is darker than the other ones; your adjustment has made it non-linearly more so, at least, to the eye. $\endgroup$ – Robin Betts Sep 18 '18 at 7:32
  • $\begingroup$ Hi Robin, the picture i stored from blender is PNG format with 8 color depth, with 1500 render samples. then in photoshop i just tried to raise up the brightness a little bit but as you see the bottle still darker than the other ones, $\endgroup$ – Jamil Sep 18 '18 at 8:48
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We can see a gradient of light:

enter image description here

It goes from dark to light, which is not surprising at all keeping in mind how the scene is lit. The explanation is very simple: you have an area light on one side, but not the other. The further away an object is from a light source the less light reaches it. Sun lamps in Blender are different from real world lights because they simulate a light source infinitely far away, but the other types of lamps in Blender will become dimmer as you go further away from them. You will just need to adjust your lighting until you get your desired result.

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  • $\begingroup$ thanks you very much Martin Z, so should i duplicate the Area lamp to the other side on the left of my scene?! $\endgroup$ – Jamil Sep 18 '18 at 8:54

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