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(i have answered myself, problem solved)

If two middle-grey (0.5 value) images are used and combined in Overlay mode the image will get darker. How can i keep the same value and add the details of both textures?

Here is the ambiant occlusion map with a middle-grey:

enter image description here

And here i add another texture in overlay with a middle-grey this can be a bent map for the lighting or a curvature map, as you can see the image becomes darker and it becomes very dark if i increase the factor:

enter image description here

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    $\begingroup$ instead of editing the question and marking it as problem solved, mark your own answer as accepted. $\endgroup$ – user1853 Jan 31 '17 at 16:26
  • $\begingroup$ I must wait one more day to be able to click it. $\endgroup$ – Danyl Bekhoucha Feb 1 '17 at 11:47
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To combine two textures with a middle-grey and keep the same value connect your previous image to an overlay node and the new in the second slot.

Because Blender uses sRGB and not a Linear color management you need to correct the gamma by connecting it to a gamma node in the image slot and for the second slot connect a math Divide node with 1 on top et 2.2.

enter image description here

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    $\begingroup$ You can prevent the sRBG transform and keep your values linear by saving to OpenEXR. If you choose to use a display referred format then use the Non-Color Data option. $\endgroup$ – user1853 Jan 31 '17 at 16:33

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