Trevor Quayle wrote:
>
> I need some sort of image editor to try playing with the dynamic
> range compression Kari is always talking about.

I checked Gimp and the Curves editor is better than in Photoshop
but it only works for 24bit images so expect to see some quantization
noise when doing big adjustments with Curves. It can also do gamma
preview according to manual but I haven't yet found the dialog
that activates it (Display Filters). For Unix there is Hollywood
Gimp. http://www.gimp.org

Because the Curves editor scales are linear most of the curve
affects the bright areas and an equal change in the top and
bottom part of the curve produces much bigger change in the
dark areas.

Here is an example of a real film response curve in
logarithmic and linear scales. http://www.pp.htv.fi/kkivisal/curves/


_____________
Kari Kivisalo

Post a reply to this message