You can experiment with G’MIC:
gmic 4Comparison.jpg split c histogram 256,0,255 append c cut 0,400000 display_graph 1024,512,3 -o histogram1.png
gmic 4Comparison.jpg display_histogram 1024,512,256,0,255,1,"cut(i\,0\,400000)" -o histogram2.png
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