Hi,
Please find below my function shot_histogram_get_range(...), I return only rng.
I realise an histogram with that I get only 64 value equi-distributed on 0-1023. But this histogram does not match with the histogram calculate by canon or gimp. And this histogram means nothing for me. When the picture has a correct exposure histogram extract by lua script using (get_histo_range()) display a dark histogram!
I think the problem is in build_shot_histogram() when chdk called get_raw_pixel(x,y). get_raw_pixel() is it safe?
Thanks,
Dav
/**
shot_histogram_get_range
**/
int shot_histogram_get_range(int histo_from, int histo_to)
// Examines the histogram, and returns the percentage of pixels that
// have luminance between histo_from and histo_to
{
int x, tot, rng;
tot=0;
rng=0;
if(!shot_histogram_isenabled()) // TODO we could return an error somehow
return 0;
for (x = 0 ; x < SHOT_HISTOGRAM_SAMPLES; x ++ )
{
tot += shot_histogram
if (x>=histo_from && x <= histo_to)
{
rng += shot_histogram
}
}
// try
return rng;
// Default config
// return (rng*100)/tot;
}
