OS X V10.7 Lion :: Reduced The Screen Bit Depth?
May 8, 2012
When I was on Snow Leopard I was painting in Photoshop in 16-bit mode on my 21" Wacom Cintiq.It was a fantastic experience to finally have true control in settle changes in hues and shades all over the spectre.
Now that I've updated to Lion, the screen doesn't display true 16-bit graphics anymore, but instead there is pretty noticable banding. A sort of real-time downsampling in bit-depth going on. Even flickering on some grey hues. I'm very sad about this, and it's affecting my work.
I have a hunch Lion is harder on old graphics cards than Snow Leopard was.
Is my machine too old for displaying true 16-bit/ 32-bit graphics with Lion?
In the system info under the graphics card it says: 32-bits color (ARGB8888), but it clearly isn't the case in terms of what is sent to the display.Â
MacBook Pro, late 2009, 8GB ram, 2,66 GHz Intel Core 2 Duo, Unibody
NVIDIA GeForce 9600M GT 256 MBÂ
What I've tried so far (without solving the problem)
Closing Macbook screen to run only one display (Cintiq) (to save graphics memory, I thought) - no change.
Trieid displaying the same 16-bit image in different apps: Photoshop, Preview, Quicklook, Pages - no change
Forced monitor into "billions of colors" using SwitchResX - no real changeÂ
Anyone who knows more about this?Â
I will now try:
- finding Cintiq driver updates
Info:
MacBook Pro
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Do you know of any simple audio recording app (ie: not a monster audio suite) which takes low CPU usage, and lets you choose the internal bit depth using for audio sampling (ie: sample at PCM16, at PCM24,...) ? Â
Now, in case you need it, the long version of the question:Â
I'm digitizing my huge collection of audio tapes, with my G5 iMac (OSX 10.4). The quality of the recordings is somewhat low, so I don't need a high-end audio card, and I believe the builtin audio card of this G5 is more than adequate for this task (Burr Brown PCM3052 with support for PCM16, PCM24, and AC3 16).Â
I've done my first tests with the just-released new version of Audacity (2.0.0), which is compatible with 10.4 and higher, so I'm very happy to be able to install a brand-new application in 10.4.Â
Audacity works fine, but has a couple of issues:Â
First, you can choose the audio track bit depth, but not the internal bit depth at which you're sampling. In other words, I'd expect to use some selector to choose from PCM16 or PCM24 recording, which is what this iMac seems to support. However, I can only choose the storage bit depth, not the sampling bit depth. I suppose Audacity is recording at PCM24, but I've no way to test this.Â
Second, it takes about 40% CPU usage while recording (yes, I disabled the realtime graphics update of Audacity... if I don't disable it, usage becomes 60% or higher).Â
I tried Audio Hijack Pro (well, the last version supporting 10.4), and it won't let me choose the sampling depth either.Â
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[code]....
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