Projector Contrast Ratio
So what exactly is Contrast Ratio?
Projector Contrast is a measurement and ratio of the difference between the black and white areas of an image. The larger the contrast ratio of a display device, the greater is the difference between the brightest whites and the darkest blacks a video projector can display. A contrast ratio of 400:1 would imply that the black level is 400 times darker than the white.
Do I need to worry about Projector Contrast Ratio?
The contrast ratio is basically the ratio between black and white areas of the image projected. Ambient room lighting will be generally impact the contrast ratio by making the blacks appear less black, so if plan on using a projector in situations where there will be excess ambient light, it is suggest to go with projector that has a contrast ratio of 400:1 with a higher lumen output. 400:1 contrast ratio is usually sufficient for computer graphics and data, but if you do wish do you use your projector for higher quality images, it is recommended to have a projector with a contrast ratio of at least 1000:1.
Low Contrast Ratio
When contrast is low the images projected will appear wash out. As you can see in this example parts of the image become difficutlt to see clearly.Projectors with a contrast ratio of less then 500:1 typically provide low contrast. 
Medium Contrast Ratio
When a projector provides good contrast, the images projected appear clear and attractive. Projectors with contrast ratios ranging from 500:1 to 1200:1 typically provide medium contrast.
High Contrast Ratio
With high contrast, images are ultra crisp with vibrant colors. Projectors with contrast ratios exceeding 1200:1 typically provide high contrast, DLP technology projectors currently offer these high contrast ratios.
HIGHER CONTRAST = HIGHER IMPACT
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