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Work in 16bit? What beast of machine you've got?

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  #1  
Old 08-05-2010, 06:38 AM
samimg samimg is offline
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Work in 16bit? What beast of machine you've got?

Hi all,

I'd love to work in 16 bit for its benefits of image quality (no fine noise when doing frequency separation, less banding etc).

I've got a Mac Pro Quad 2.66 / 8GB RAM, with separate internal hard drive as a scratch disk. Everything's fine when working in 8 bit, even large files from digital backs with lots of layers.

In 16 bit, image approx 6000x4000px, even a couple of layers slows down everything, but especially saving to an unacceptable level, it's a couple of minutes to save. I like to save a lot so I just end up working in 8 bit.

I've tried working in 16bit on a 2009 8 core Mac Pro Nehalem too, it was faster, but still noticeably slower than 8 bit.

If you work in 16 bit only, and are happy with the speed, what monster of a machine have you got?
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Old 08-05-2010, 08:44 AM
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Florin Florin is offline
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Location: Trujillo - Venezuela
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Re: Work in 16bit? What beast of machine you've go

Hi. I made some tests on the job I`m doing right now:
1. image size is 4800 x 6844 pixels, 800 dpi, background and 1 layer (work on background and have the layer as an untouch original file, for compare), PShp indicates Doc31.3Mb/62.7Mb on 8bit/channel, gray scale
I did some brush strokes and saved: 1.5 seconds
2. changed to 16 bit, gray scale, size changed to 62.7Mb/125.3Mb, did the same and saved in 10 seconds.
3. changed to RGB, size is now 188Mb/376Mb, saved in 32 seconds.
If I`m not whrong, the doc size has 2 values, physical/disk.


My system is:
MSI K9N2 Sli Platinum motherboard
Phenom II x3 720 BE with Thermaltake Venus 12 cooler, 3200 Mhz
8Gb (4x2Gb) Patriot PVS24G6400LLKN Extreme Performance Viper Series PC2-6400 CL4 DDR2-800 Dual Channel
MSI nVidia GForce 9600GT / DDR3 512 Mb
x2 WDigital Caviar Black bulk / sata 300 / 32Mb cache / 750Gb each
DVD-RW Plextor px-810SA
PS Xion Power Real 2.2 / 600W
Aluminium case Viper XG with x3 120mm Ever Cool Spider fans (front, back, up)
1 monitor LG Fantasy 19" / 4:3
Logitech 2.1 sound system
Microsoft keyboard
Microsoft IE mouse
OS Windows 7 Ultimate x64

Regards
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  #3  
Old 08-05-2010, 08:45 AM
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andrewrodney andrewrodney is offline
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Re: Work in 16bit? What beast of machine you've go

Any machine will run the 8-bit faster so its difficult to not be affected by this speed increase. That said, the speed hit is well worth the possible quality benefits and archive properties of high bit (16-bit) data. See http://www.digitalphotopro.com/gear/...-decision.html
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Old 08-05-2010, 09:18 AM
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DJSoulglo DJSoulglo is offline
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Re: Work in 16bit? What beast of machine you've go

Get a buttload of RAM, run CS5 (it's a LOT faster than other versions of PS). Be patient.
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Old 08-05-2010, 09:34 AM
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Florin Florin is offline
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Re: Work in 16bit? What beast of machine you've go

I agree about the RAM, look for compatibility brand and top quality. Since I changed for Patriot y have an almost perfect system. I had before a Corsair Twin DHX and my workfow was a hell. Crashes and lost files, video probems, BSOD and so on. This Patriot is the best of the best for my DDR2 mobo. Never failed and I`ll not change to DDR3. I`m happy with it.
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Old 08-05-2010, 01:03 PM
samimg samimg is offline
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Re: Work in 16bit? What beast of machine you've go

Florin - Your test proves the time spent saving raises exponentially, imagine you add 10 more layers with masks, some adjustment layers with masks, etc and everything slows down to crawl.

Andrew - Really informative article, thanks. I agree on the benefits of working in 16 bit, but it comes at a price of extra time spent waiting! Or at the price of new 12 core Mac Pro??

DJSoulglo - Good to know that about CS5 mate!
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Old 08-05-2010, 07:51 PM
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Florin Florin is offline
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Re: Work in 16bit? What beast of machine you've go

How many Mb has your "slow" file?
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Old 08-10-2010, 01:23 AM
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BriPriUK BriPriUK is offline
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Re: Work in 16bit? What beast of machine you've go

Quote:
3. changed to RGB, size is now 188Mb/376Mb, saved in 32 seconds.
If I`m not whrong, the doc size has 2 values, physical/disk.
Hi
The first size is the size of the flattened file, the second the size including layers.

Brian
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Old 08-10-2010, 11:48 PM
Quantum3 Quantum3 is offline
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Re: Work in 16bit? What beast of machine you've go

Have an oct-core with 8GB of RAM and happens the same to me. It's not the amount of cores, as far as I understand what you write, but how the amount of RAM is being used. 8GB seems to be a lot, and it's, but an image with tons of layers (even in 8 bpc) demands too much RAM. Also, there is a damn bastard app running on the background called mdworker that sucks all the RAM, specially when saving. At the least, 2 GB of RAM are sucked by that damn app till around 3.5 or so. This app is the cause of the problem. I have found it related to the QuickLook app and the indexation of the file for spotlight, but I have configured the Spotlight to not index PSD/TIFF but mdworker still active.

If someone knows how to kill the mdworker or something related, drop a line!

Mart
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  #10  
Old 08-11-2010, 12:32 AM
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Florin Florin is offline
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Re: Work in 16bit? What beast of machine you've go

One of the tricks to accelerate your disk(s) is to desable the Windows index service. Right clic over your C: / Properties / and uncheck the idexfiles service. This stuff is usless. I saw this years ago in a lot of hardware and software forums and it's fine. You`ll win some 25% more disk speed.
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