I came across Pixelpost. Its not what i want, because i use Zenphoto with great pleasure.
But what got my interest was a nice plugin called RGB_Histogram.

This is a function i would really like to see in Zenphoto.

Link to the plugin: http://www.pixelpost.org/extend/addons/rgb-histogram/

Pardon my ignorance. For what is that exactly needed on a website? Couldn't you just use your image editor for that?

Why don't you try to write a plugin for that, we always welcome user contributions...:-)

I am a photographer and for me it is verry handy to see that histogram. I can get a lot of information out of it.
I already see now some photo sites that have this option. Its a nice extra EXIF feature that when i see it, tells me a lot about the image.

Write a plugin myself ... I am very bad with programming, but i will try, so maybe someone reads this and thinks its a nice project for him/her to do that would be great!

I played with this before - adding a histogram to view along with the EXIF info seemed the most sensible place to use it. If I get a chance, I'll revisit it and see if I can tidy up publish what I did.

That would be great!!!

There is already a histogram plugin... Recently came out...
http://www.zenphoto.org/support/topic.php?id=3606&replies=11
http://www.marcelspijker.nl/marcel/zenphoto/?p=links