System >Exporter > sRGB, Blender saves also brighter images

[JuhaW]

I have color mapping "Don't affect colors" and render output is Blender save. System > Exporter > sRGB is ON and saved images are saved brighter than sRGB OFF.
It sets VFB sRGB on but Blender saves images same same way. If I set exporter sRGB off then Blender saves correctly but I need to manually set it on in VFB after every render.
I want to see sRGB but saved images should be darker for easier render pass combining.
Or is there a trick to do it with Blender ? (not via VFB save).

[JuhaW]

I found a way, I save .exr files from Blender and System > Exporter > sRGB on does not affect anymore. With .png files it affects.