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Faulty TFT screen?
toadlet
Registered Users Posts: 192 Major grins
For the past 6 years I have used a CRT monitor and the last year a notebook screen to edit my photos of which I have been more or less happy with how the image look on screen.
Recently I bought a LCD 22" screen and have noticed that when I edit my photos and bump the contrast up that sometimes the darker areas get a lack of detail - its hard to explain, but its kind of like the screen cannot read the full range of tones of the image . I have not experienced this on my other screens. Is this a limit of LCD screens?
Recently I bought a LCD 22" screen and have noticed that when I edit my photos and bump the contrast up that sometimes the darker areas get a lack of detail - its hard to explain, but its kind of like the screen cannot read the full range of tones of the image . I have not experienced this on my other screens. Is this a limit of LCD screens?
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Well, most 22 inch monitors use a "TN" TFT LCD panel and don't offer true 8bit colour depth, instead using an interpolated 6bit scheme. This 6bit colour depth can cause some odd effects including posterization/banding.
But, recently there have been a few 22 inch monitors brought to market that use a "PVA" TFT LCD panel. While PVA panel LCD monitors typically offer true 8bit or better colour depth, one drawback to PVA is they exhibit what is sometimes called "black crush". When viewed from straight on is when this black crush is most noticeable.
Can you tell us the manufacturer and model of your monitor so that then we can pin it down a bit better?
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TN panel, 6bit colour depth.
This model is an inexpensive LCD oriented to gamers and general home/office use - email, document editing, web browsing. It is not built for quality image editing.
FYI, you can research these things on several web sites.
I'm too lazy/busy to retype the info so I'm going to link you to a thread I posted on another forum:
http://forums.dpreview.com/forums/read.asp?forum=1004&message=30092511
If you're considering buying a better LCD monitor and are budget limited there are several monitors introduced recently that have proven to offer a very good image or are just entering the channel and look promising.
Here's something I posted in that same forum:
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Up until a couple of months ago there was little to recommend in the 22 inch size of LCD monitors. However, there has been a number of announcements recently.
If I had the time, I'd watch very closely what is happening with either the Dell 2209WA or the NEC P221W.
22 inch
Lenovo L220x
* available now
* S-PVA panel, 1920x1200 resolution
HP LP2275w
* available now
* S-PVA panel, 1680x1050 resolution
* http://www.prad.de/en/monitore/review/2008/review-hp-lp2275w.html
Dell 2209WA
* coming soon - see other posts in this forum
* 178 degree viewing angles indicating not a TN panel
* info to date states an eIPS panel
* 1680x1050 resolution
* Australian info - pricing just posted! states IPS panel.
* http://www1.ap.dell.com/... .../compare.aspx/22lcd?c=au&cs=audhs1&l=en&s=dhs
* Canadian info - just posted! $369 CAD
* http://accessories.dell.com/... ...spx?c=ca&l=en&s=dhs&cs=cadhs1&sku=320-7825
* CNET Australia review
* http://www.cnet.com.au/desktops/monitors/0,239029427,339294389,00.htm
NEC P221W
* coming soon
* S-PVA panel, 1680x1050 resolution
* 10bit internal LUT
* http://www.necdisplay.com/... ...product=48cbd139-f704-486d-9be5-880367d76bfa
24 inch
Not much "new" under $600 USD.
Samsung 245T
* S-PVA panel
Dell 2408
* S-PVA panel
HP LP2475W
* H-IPS panel
* pricing is likely to be closer to $700 USD
* would be my choice in a 24 inch if budget limited
* http://www.prad.de/en/monitore/review/2008/review-hp-lp2475w.html
NEC 2490UXi
* H-IPS panel
* closer to $1100 USD
* would be my choice for a 24 inch monitor on a moderate budget.
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