req better histograms, highlights

[obelisk]

I read my camera histogram fine, it shows 0 and 255 values running up the sides of the histogram. But in xnview I can never tell if the values are blown or not, since there seems to be a white margin on the sides.
Also, if I have a dark pic usually the left is miles high, the rest of the histogram is so flat I can't tell anything.

Would be good to see blinking highlights too, as per camera since histograms fail me.

[rra]

another improvement would be to (optionally) use a
logarithmic scale for the number of grayscale-values.
Also a cursor which can move around along the (or one of the) histogram-curves
showing the number or percentage of greyscale-values that are present in the image for the selected greyscale

I also have a question:

what exactly is the grayscale filled plot suppose to represent ?

René

[obelisk]

gray one is the RGB combined.

[rra]

gray one is the RGB combined.

Yes, ofcourse, question is what the gray curve is supposed to be,
if it is the luminance then generally the formula:

RGB Luminance value = 0.3 R + 0.59 G + 0.11 B

is used, (see: http://www.scantips.com/lumin.html )
but that is not at all what I see looking at the histogram of some images.

René

[marsh]

The Qt version labels it RGB + Luminance (it looks like same scale as v.1.96)

[marcoswat]

Log scale histograms would be easier to read. Like in camera ones