Thanks to all... Now it's work...
>> You are attempting to modify a color at some random memory location, that's never been allocated (you didn't initialize colore) and then you passed this dodgy pointer to gimp_by_color_select. In most parts of the GIMP, GimpRGB are statically allocated, and you see that they are used more like this:
GimpRGB colore;
GimpChannelOps parametri;
gboolean success;
gimp_rgb_set_uchar(&colore, pixel[0], pixel[1], pixel[2]);
parametri = GIMP_CHANNEL_OP_REPLACE;
success = gimp_by_color_select(drawable->drawable_id,
&colore,
termogramma.scarto,
parametri,
FALSE,
FALSE,
0.0,
FALSE);
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