Banding in broad color space???? grrr

Question

I'm on an old laptop, PS 5.5.  I have a properly exposed iso 1800 D600 jpg
captured in adobe rgb color space.
I use camera raw to open this picture in photopro space and 16 bits to
avoid banding and yet if I lift the curve a tiny bit or any other brightening trick
immediately there is banding.  What?

Answer 1

Steve Zeeeee wrote:
What else happens with this choice and how does it affect photo editing?
As far as I know, with Photoshop CS5.5 Standard edition you'll have all GPU-dependent features, so you might just find the screen updates a hair slower - or not, modern processors are pretty fast, even in laptops.  The primary difference is that the Adobe Color Engine is executed in the CPU, rather than the GPU, and as such it produces more accurate results.
With Photoshop Extended versions and/or CS6 I think there may be actual GPU-dependent features that are hobbled or disabled if you use Basic mode GPU operations, though to be honest I've lost track of all the permutations.
Try it and let us know whether Basic mode supports all that you do, just with more accurate color.  It's what experts do when we need to use an alternate configuration setting to work around a problem.
By the way, the issue does not present itself even in Normal or Advanced modes if you choose to make the Adobe RGB 1998 profile your working space.  Since few output devices provide gamuts larger than Adobe RGB it's a possible alternate workaround.
-Noel