[Cin] Histogram plugin

Igor BEGHETTO igorbeg at visi1.org
Thu Oct 19 14:26:58 CEST 2023

I do not remember the Frame button and its Textbox as shown in the 
picture of the Manual (Figure 10.46).
Since Cin-20201031 (and before, but I don't remember when) the button is 
called "Sum Frame" and it works together with the selection (highlight) 
in the Timeline.
More, the table in the bottom of the "Histogram" subsection I am seeing 
in the HTML version is wrong.
You can see the right version in GoodGuy' reply:
The effect of this is to do this:

    1                      1
000100 3 pixels   vs   0011000  3 pixels

On the left, the course color model piles all 3 pixels into one bin: max 
value 3.
On the right, the fine color model puts the counts into 2 bins, max 2, 
sum 3.
So, by reporting the sum the shape of the results are more similar.

It is important where the 1's are piled.

Il 17/10/2023 21:35, Andrea paz via Cin ha scritto:
> I was rereading the manual about the Histogram plugin and there are
> things that I don't understand:
> 1- Is there no longer a frame interval averaging function (Frames
> button)? When was it taken out? Perhaps on this occasion?
> https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02691.html
> (moreover, the images are to be replaced)
> 2-I don't quite understand the concept of "Sum" instead of "max." The
> explanations are not clear to me. Can anyone clarify to me the
> behavior of the plugin with respect to Histogram Bezier, scopes and
> various color models?
> The explanation in the manual (section: Theory) is taken from here:
> https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg01834.html

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