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Underexposing does not recover clipped highlights

Hi!

I have an image that has few spots that are clipping and I'm trying to use the exposure correction and stop it down by 2 stops (0.25). However the image it returns has all the clipped whites that used to be at 1.0 at 0.25. If I do the same with Lightroom or Photoshop, there's more detail in the highlights showing up with values above 0.25.

These are my parameters:

imgdata.params.output_bps = 16;
imgdata.params.bright = 1.0;
imgdata.params.gamm[0] = 1.0;
imgdata.params.gamm[1] = 1.0;
imgdata.params.no_auto_bright = 1;
imgdata.params.use_camera_wb = 1;
imgdata.params.highlight = 0;
imgdata.params.output_color = 1;
imgdata.params.use_rawspeed = 1;
imgdata.params.exp_correc = 1;
imgdata.params.exp_preser = 0;
imgdata.params.exp_shift = 0.25;

What am I missing?

Thanks,

Nhat

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