16bit under 66% banding / displayed like 8bit

Question

Hi.
I've got an issue with CS6/CC (64) with 16bit files and adjustment layers.
In 100 and 66% everything is displayed ok. 50% and lower image looks like 8bit (banding).
When I'm preparing b/w photos it's really annnoying when I have to zoom in to 100% to check
if any issues are real or "buggy".
I tried with different drivers, GPU on/off and 3 machines - no more ideas.
Adam | www.jedrysik.com | photography

Answer 1

Hi George and Andrey,
thanks for your fast and helpful answers!
I indeed originally used the basic Labiew array functions (as also recommend by George)
to do the conversion.
I have programmed another routine which compares the speed of this routine
with another routine using IMAQ functions (as recommended by Andrey, just a bit modified).
(See attachment)
On my Pentium M, 1.7Ghz Laptop a 512x512 16 image gives me:
~14ms for the routine based on array fcts
~16ms for the routine based on IMAQ fcts
The IMAQ routine is probably slightly slower as it has to use the histogram routine.
(Note that the priority of the routine is changed to "time critical priority" for better time measurement.)
The routine also trys to measure the time for displaying the images.
As I measure always 0ms, I believe the task is handled over to the control panel.
I still believe that it should be possible to do this conversion faster.
Are there any undocumented IMAQ fcts that I could use? (Are there any undocumented?)
Thanks again
Ronnn
Attachments:
I16_to_U8_Image_Conversion_test.vi ‏214 KB