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Histogram: Red & green swapped?
Posted: Mon Feb 26, 2007 10:46 pm
by AloisMuc
The green and red graph are mixed up. The red channel has a green line, the green channel a red line. Blue is correct.
I compared the histogram with the D200 camera histogram, and the histogram of Corel PaintshopPro Photo XI. Both histograms are contrarily to XnView.
My Version of XnView is 1.90.2.
Posted: Mon Feb 26, 2007 11:35 pm
by helmut
I've tried to verify this, surprisingly I find that it's not that easy to say. From my point of view, the whole histogram looks somehow screwed up and not alright.
A sample image which I've used:
Histogram: Red & green swapped?
Posted: Tue Feb 27, 2007 12:06 am
by AloisMuc
Helmut,
I took your example above an looked at the histogram in XnView: Blue is mainly on the right side of the panel, green mainly on the left side.
Took the same picture in other programs with histogram the colors blue and green are swapped: Green is dominant right and blue left.
Posted: Tue Feb 27, 2007 8:18 am
by marsh
Helmut's sample image compared.
v.1.90.2 results:
Gimp Results:
Posted: Tue Feb 27, 2007 8:45 am
by nightflyer
Here's another one:
Re: Histogram: Red & green swapped?
Posted: Tue Feb 27, 2007 9:23 am
by xnview
AloisMuc wrote:The green and red graph are mixed up. The red channel has a green line, the green channel a red line. Blue is correct.
I compared the histogram with the D200 camera histogram, and the histogram of Corel PaintshopPro Photo XI. Both histograms are contrarily to XnView.
My Version of XnView is 1.90.2.
Right, there is a problem...
Posted: Thu Mar 15, 2007 12:15 am
by marsh
v.1.90.3:
Posted: Thu Mar 15, 2007 7:16 am
by helmut
marsh wrote:v.1.90.3:
From what I can see red, green, and blue are o.k., now. Not sure about grey.
Posted: Thu Mar 22, 2007 3:36 pm
by nightflyer
helmut wrote:marsh wrote:v.1.90.3:
From what I can see red, green, and blue are o.k., now. Not sure about grey.
It looks OK. XnView presents composite luminosity histogram, while in my example it is RGB histogram.
If you mean spikes, your example has not ideal tonal ranges, take a tool that enables seeing Y Cb Cr components and you will see it.