27" i-Mac with Grids showing in Adobe CS4

[Zcuda]

Ok I am new on here & couldn't find an answer or another thread discussing this. Please move it to the right Forum if I have placed it in the wrong one, Thanks.
Ok so I am working in Adobe CS4 (Photoshop) & I am seeing grid boxes when I am zoomed at 600% all the way up to 3200%. I have looked at identical files in CS4 on a Mac G-5 & they don't do this. Below you will see a snap shot of what I see & the I-Mac info... Does anyone know if this is something that can be turned off?? I looked in preferences in CS4 but, saw nothing to turn it off. Thanks in advance, Jason.

Specs:
Hardware Overview:

Model Name: iMac
Model Identifier: iMac11,1
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 8 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: IM111.0034.B00
SMC Version (system): 1.54f33
Serial Number (system): ---------------------
Hardware UUID: 6764133A-6CDD-5034-B5F3-C4D9F8BB4351

ATI Radeon HD 4850:

Chipset Model: ATI Radeon HD 4850
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x944a
Revision ID: 0x0000
ROM Revision: 113-B9110C-425
EFI Driver Version: 01.00.383
Displays:
iMac:
Resolution: 2560 x 1440
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Connection Type: DisplayPort
Cinema HD Display:
Resolution: 1920 x 1200
Pixel Depth: 32-Bit Color (ARGB8888)
Mirror: Off
Online: Yes
Rotation: Supported


Below pic is zoomed in at 3200% .

 

[Tango Charlie]

I'm not in front of my pc right now, so I can't double check this stuff, but I am pretty sure it's an option. It come along with GPU acceleration, so if your older machines didn't have a supported card, that could be why it wasn't displaying.

Go into the prefs and find the GPU settings. Should be under performance or something. There should be a little button to access more gpu settings, and there might be a preference in there. Or it could be in the General section. I'm not sure. But it is definitely an option.

Hope that helps (sorry for the non-specificity)

 

[Tango Charlie]

(Basically, I'm saying double-check those preference panes. It may also be a tool option for the magnifying glass)

 

[Zcuda]

aah

ok I will give it a try. Thanks,

 

[Zcuda]

aah Found it

OK I found it here... I changed the setting but, had to restart CS4 for it to take affect. Now I need to look up whether it helps or hinders with it on or off. Thanks

 

[Tango Charlie]

I'm fairly certain it's an aesthetic option. Leave it on if you like it, off if you don't. Shouldn't affect performance in any meaningful way.

 

[Zcuda]

Performance

OK so after reading up on the GPU option... it appears that if you turn it off then some of the processing that the GPU was performing is now put on the CPUs shoulders hence by leaving it on there are performance advantages. Thanks for the input everyone. Jason

 

[plasticphyte]

The effect you're talking of is actually an inbuilt feature of Adobe Photoshop CS4 - it's supposed to make working at the pixel level easier.