saving hrd or exr, is this an error?

[VASLAVO]

Hi guys, ive encountered a problem of diferent results saving an image with 32 bit information, it doesnt give me the same results, if my final render is raw image with an exposure of -.5 when i save it as it it shows tha same on photoshop but when i apply exposure control for example -2 on photoshop and -2 on corona( it says -2.5 becaus my zero level was -.5) i dont get the same results, on photoshop i loose color, im i doing something wrong?  here are the examples

[romullus]

You have tone mapping applied. Set highlights and contrast to default values, save with gamma 1.0 and then do comparison.

[Ondra]

indeed, this has to be done without highlight/contrast changes