Luminous Landscape Forum
Raw & Post Processing, Printing => Digital Image Processing => Topic started by: zaharia on August 14, 2007, 04:56:40 am
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To the color guru gods on this board - please advise.
I've had a new Dell 3007WFP-HC 30" flat panel for a number of months now set-up as a primary monitor. I have it profiled with BasicColor Display 4.1.2 (latest version) using an original Squid. My secondary monitor is an older Dell 1901 flat panel also profiled with BC and the Squid.
I had always been happy with the 1901's when I ran them as dual display and calibrated. They matched each other perfectly. (color wise) Was always happy viewing greyscale images on them as they were pretty void of a color cast. I wanted the larger screen, so replaced my main 1901 with the new Dell 30".
The problem is that even after profiling, the 30" had a slight green cast. Not that noticable until taking an image (greyscale) and passing it back and forth between the two monitors. The image on the old 1901FP is great and with no cast, same as with the 2nd 1901FP I used to have. They were great together. I have done the profiles numerous times and checked them with Basiccolor's validation tool and they are okay. (according to the software - what else would it say )
I was trying to live with it, (REALLY bugs me) but was out looking at a new Toshiba HD TV today that uses a new CCFL backlight and it had a green cast. Checked out some forums for users of this Toshiba and they are all (most - some probably can't see it)compaining of a green cast that they can't get rid of no matter how they adjust the color settings on the set.
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The specs of the Toshiba say:
ColorBurst™ Wide Color Gamut LCD
Wide color gamut LCD expands the number of available colors and improves the color accuracy. While standard LCD panels may only reproduce 72% of the NTSC color gamut, ColorBurst™ utilizes enhanced CCFL back-light technology to expand the color range to 90%+. This significantly improves both color purity and color saturation, and combined with superior processing and a superior back-light, creates colors that are vibrant and natural.
This is very similar to what the specs of the Dell 3007WFP-HC say:
Today, most monitors feature color gamut covering 72 percent of the NTSC color space. The new Dell 30-inch monitor increases the coverage to 92 percent of the NTSC color space utilizing a Wide Cold-Cathode Fluorescent Lighting (W-CCFL) backlight that delivers gamers, photographers and digital media "prosumers" highly vibrant and vivid images such as deeper reds and crisper blues.
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Now the 3007 uses a S-IPS panel and the W-CCFL backlight. I am not sure what panel the Dell 1901FP uses (PVA maybe?) or what the backlight is, but I notice that with no signal to either of them and with a blank black screen and the backlight on, the 1901FP has a red cast and the 3007WFP-HC has a green cast.
So, is this green cast just something inherant in the design because of the flourescent backlighting on the 3007 and the profiling software can't zero it out? Or is it a limitation of my older technology Squid? Will any of the newer hardware devices be able to filter out the green cast from the flourescent backlight? How come BasicColor makes the profile, validates it- it checks out okay and yet I see the green cast? Certainly I'm not the first to see this, so what's up?
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Anyone? Any ideas?