Here is better result by using 3 different response curve (red, green & blue) at the same time.
1. Linear tone mapping in log domain :
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-sz4oidkDALjXTP7n3dcv03CyATGlch6cVuYtUdbItVzgsdR8fJIsathjD-hKgXg099wbr2nyvAxsij-XDYR00pFa8bUMK7d9c0pNeAVom0JQStmwjKnWL5WMWhZ2TxwG8BMVf9K7NtI/s320/hdr_tm_linear.jpg)
2. Tone mapping in gradient domain :
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwH2onxVAhiPRYt-FodUv0FGGsgNd2x2nvxvIkKFLfId3aLiwP2O1WF4yEAYX5nLFNbzsnl0l3BW1QQzFw48BldhKjyRkcT3AuLMJWFzkrRmitWOnmBaLq7z__lhqNXyjAvLbrNVdvXyA/s320/hdr_tm_gdomain.jpg)
p.s.
In sampling step, I sort all pixels in the image with largest exposure. Force sampling the brightest pixel, then sampling the others averagely.
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