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LCD Displays And The Human Eye - The human eye is surprisingly easily tricked, so watch out when using your LCD monitor!
The image is made up of a row of images of slightly different grays (1050 × 300 dots). If you cannot see the boundaries between the grays there is probably a problem with the display environment or gradation expression of your monitor. What we mean by this is a normal colour or monochrome gradation image should be smoothly reproduced. If there is a problem with the gradation expression it produces things like blocked-up shadows in dark areas and blown-out highlights in light areas, banding (vertical or horizontal stripes) in the middle gradations and colour cast.
The answer to the question asked above is 'the far right' so if the other grays looked correct, colour may not be being correctly recognised for a variety of reasons, which includes the lighting environment or the LCD settings.
For example, when the room is lit with standard household incandescent lights white and gray look reddish, while fluorescent lights can make them appear green. Plus, as mentioned in our previous article, white and gray can have a reddish tinge when the monitor has been set to a low colour temperature, while a high setting can give them a bluish tinge.
Another problem is that our eyes are easily influenced by surrounding colours. The following patterns will highlight how easily influenced our eyes are by surrounding colours.
In the top image, the gray in the center of each square is in fact exactly the same colour. However, the grays with a dark surrounding look light and the ones with a light surrounding appear dark. This is known as 'brightness contrast'.
The orange in each of the squares is also exactly the same colour. However, when the surrounding saturation is high (red) the orange seems to have a low saturation, but when the surrounding color has a low saturation (green) the orange seems to have a high saturation. This is known as 'chroma contrast'.
It can be difficult to accurately distinguish colour just by looking at it, particularly when there's only a slight colour cast. An effective way to make subtle adjustments to the colour detail of image data is to display neutral gray or white image data and use that to measure.
The important thing to remember is that you shouldn't adjust the image quality of your monitor or edit material while looking at colours that are being wrongly recognised.
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