//Vertical Lines if (conf.histo_show_ev_grid) for (i=1;i<=4;i++) draw_line(x+(1+w)*i/5, y, x+(1+w)*i/5, y+h, FG_COLOR(conf.histo_color2));
If drawing stops the positions would be at 186.8, 136.3, 99.4, 72.6, 53 (down from the highlights at 256), as opposed to at i/5. The sequence continues but gets more compressed, ie 38.6, 28.2, 20.6.
While the values provided may work for the M3, I doubt they would be consistent across all cameras.
I will say, however, I don’t believe is correct to say they are Ev divisions.
if (histo_max[HISTO_RGB] > 0) { // over- / under- expos under_exposed = (histogram_proc[HISTO_RGB][0]*8 +histogram_proc[HISTO_RGB][1]*4 +histogram_proc[HISTO_RGB][2]) > exposition_thresh; over_exposed = (histogram_proc[HISTO_RGB][HISTO_WIDTH-3] +histogram_proc[HISTO_RGB][HISTO_WIDTH-2]*4 +histogram_proc[HISTO_RGB][HISTO_WIDTH-1]*8) > exposition_thresh; } else { over_exposed = 0; under_exposed = 1; }
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