The attached image is completely grayscaled -- no color whatsoever.
This means your computer monitor is lacking in quality. For example, when an image has a green tint on a non-RGB CRT monitor, it generally implies that the luminance (Y) is overpowering the chrominance (Cr + Cb). Luminance in a color YUV signal also contains the green portion of the image. The chroma channels carry the red and blue, and at half-scaled sizes. Hence 4:2:2. This also applies to video input devices, such as DVD player. Certain latter-model LiteOn (and iLo clone) DVD recorders, for example, were infamous for playing and recording "green tinted video". An undesirable effect, to be sure!
The tint problems can be inherent to the monitor, as well as caused by graphics cards, video cards, video chipsets in standalone players, or even inferior cables. So you problem could be a bad wire, bad graphics card, or even a bad LCD (or CRT, etc). It can also be caused by the monitor color settings (gamma), or even the colorspace being used by the computer (sRGB vs others). You can drill down even further, and have software-based changes in color -- AdobeRGB vs sRGB, for example, for the calibration settings within Photoshop.
On a high-quality IPS based flat LCD panel, the attached image is perfectly black, white, and shades of gray. Zero colors, zero tints.
If you do a lot of graphics, video or image work, you really should use color-accurate IPS LCD monitors. For example:
- ViewSonic 23" IPS LCD @ B&H
, $285 - http://www.bhphotovideo.com/c/produc...3167/KBID/4166
- HP 22" IPS LCD @ B&H
, $265 - http://www.bhphotovideo.com/c/produc...3167/KBID/4166
- HP 30" IPS LCD @ B&H, $1200 - http://www.bhphotovideo.com/c/produc...3167/KBID/4166
- ViewSonic 26" IPS LCD @ B&H, $880 - http://www.bhphotovideo.com/c/produc...3167/KBID/4166
- Amazon.com also has IPS LCD monitors
, though B&H is my preferred vendor for this specific kind of item, and prices seem to be better.
In UK / Europe:
- LG 23" S-IPS @ Amazon.co.uk
, £155 - http://www.amazon.co.uk/gp/product/B...SIN=B004GV9ADW
- LG 30" S-IPS @ Amazon.co.uk
, £855 - http://www.amazon.co.uk/gp/product/B...SIN=B0015LWB00
- Dell 23" IPS @ Amazon
.co.uk, £220 - http://www.amazon.co.uk/gp/product/B...SIN=B003R7K332
LG is easily the best of the IPS monitors, in terms of color accuracy, and features somewhat more advanced "S-IPS" technology.
Viewsonic makes for a nice runner-up maker of IPS monitors, along with other brands like HP, NEC and Dell.
There's also Eizo and Lacie brands. Eizo is a fan favorite in the photo community, though it seems overpriced to me, especially compared against a good LG S-IPS LCD. And then Lacie is not a manufacturer, but simply a private-label brand, and I'm not readily aware of what brand of monitor is actually "under the hood". Yes, Eizo and Lacie sell good stuff that works, but you pay for the brand name as much as for the item itself. While cash-rich photographers will tell you to use Eizo, us normal folks can make out quite nicely with LG and ViewSonic, getting the same performance at a fraction of the cost.
When it comes to images being too dark, uneven, full of red tint, blue tint, yellow tint, green tint, purple tint, etc, it's quite often a problem with the monitor technology. A TN based (non-IPS) LCD is great for average users with video games, movie watching, email, typing in Word, etc -- but when you're wanting to do serious graphics/image/video work, you'll benefit quite a bit from an IPS panel.