CompuServe Thread

#Gamma

6 messages in this thread
#101168From: Joseph M. WilsonMay 11, 1994 5:20 PM
Does 1.25 seem too low for monitor gamma? All of my renderings are too dark, yet the grey boxes say 1.25 is correct. I must still be missing something… –John
#101177From: Yost GroupMay 11, 1994 6:08 PM
1.25 seems does seem low. I've found, when it doubt, set it for 1.80, and don't lose sleep over it. Are you viewing your renderings on your monitor, or on a framebuffer? Have you checked the contrast & brightness settings of your monitor? – Jack
#101190From: Joseph M. WilsonMay 11, 1994 7:38 PM
I preview renderings on my computer monitor, and the contrast and brightness levels are normal (near as I can tell). Why would the grey boxes be telling me that my gamma should be 1.25? I guess my problem is that I have no reference, except the grey boxes, and they don't seem to be within a stone's throw of being accurate. I will set it (for now) at 1.8, I would appreciate any help ya'll could give in the fine-tuning. Thanks! –John
#101223From: M. G. BATCHELORMay 12, 1994 12:24 AM
John, PMJI, but what display or framebuffer are you using, and is it displaying 24-bit ? Does it feature hardware gamma correction ? What method have you used to substantiate that brightness/contrast are set correctly ? What monitor are you using ? Do your renderings look correct when displayed from an application other than 3DS ? Have you checked them on another system/display ? Are you certain that your lighting is positioned and adjusted accurately as well as your surface attributes ? Have you checked rendering with just omni lights, no falloff, etc.? What value is entered in the NEXT field after the display gamma using the matching swatches (framebuffer)? Do the renderings look correct with Gamma set at 1.8 AND also look correct when displayed from another application ? If so, forget about it. These are questions to answer in determining your problem. Regards, BILL
#101419From: Joseph M. WilsonMay 13, 1994 1:15 AM
Thanks for the reply — I've gone through all of these questions, this is a rather strange experience. I'm using the Viper VLB with a Tri-Star monitor (which I believe is made by Samsung) I don't see any simple reason why this thing would be giving me the strange gamma output. 1.25 is really low! (a huge difference from 1.8!) I am using an A/B switch for the monitor, but that still shouldn't make that much of a difference. 1.8 gives me a good-quality rendering, so for now I'm going to stick with that setting, but I would sure like to know why the calibration is so far off. Thanks again– –John
#101556From: M. G. BATCHELORMay 13, 1994 3:21 PM
Joseph, << I've gone through all of these questions >> I, nor likely anyone else can help you if you don't post the answers to those questions. The gamma-matching device is just intended to be a possibly useful tool. If you can find a gamma setting which looks correct within 3DS AND (important) also looks correct when displayed outside of 3DS AND looks correct on another system, then forget about it – that's all that counts. BILL