CS4 - histogram blank

[troypiggo]

Trying CS4 trial version. I'm opening TIF files stacked from DSS, but the histogram is not showing anything, just a circle with a line through it. If I open a RAW file the histogram does show up and I can see the RGB channels histograms. But it just won't display for stacked TIFs. Any ideas? Something to do with colour profiles or working profiles or something?

[Octane]

I don't have CS4, but, all I can think of is Image > Mode > ? Are they 32-bit or 16-bit? Try converting to 16-bit and see what happens.

Regards,
Humayun

[tlgerdes]

I am with Octane, I dont get a histogram in CS2 until I convert to 16bit.

[troypiggo]

Aah, yes. That did it. They were saved as 16 bit TIF from DSS so I hadn't looked at that Mode setting.