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Tone map an already rendered image

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Have a scene that looks good when rendered in Prorender (R20) 32 bit with tone mapping (Reinhard 2)
But to avoid choking and freeze my computer when rendering a really large image I have to render it in 4 parts by specifying areas with Active render region in the render settings.

My problem is that Tone mapping evaluates the “image”, e.i, areas not rendered is obvious not taken into account.
So if I render 4 parts and piece them together I Photoshop the Tone mapping effect differs from image to image.

Is it possible to render all parts, piece them together in Photoshop, and then apply the Tone mapping in C4D?

Have tried Photoshop's Tone mapping and fiddled with the settings but can’t get it as good as C4d’s Reihard 2 preset.

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