What You Need To Know About Picture Quality
Tuesday, January 19th, 2010The difference between good and poor picture quality can be seen by anybody. However, it is not very easy to understand the technical issues that make a picture look good. One very important element of picture quality is contrast ratio. Other aspects are the color saturation and color accuracy, and resolution is also very important.
The ratio between the darkest and brightest color your HDTV can produce is called contrast ratio. Your HDTV has high performance if the contrast ratio is high. Low color ratio means a dull experience: pictures will be washed out and details can be lost. However, it is unlikely you will buy an HDTV with poor contrast ratio. In recent years technology has improved greatly, which means even cheaper systems have fairly decent contrast ratios. Obviously best contrast ratios are expensive, but this is also getting cheaper.
Another important aspect of image quality are the black levels. Systems with poor black levels will have grayish blacks when absolute black is expected. Poor black levels can be especially annoying in dim light conditions, because in this type of light the human eye is very sensitive to dark images. Lot of users set black levels very low, to achieve absolute black. This is a mistake: by doing this, black shadow details can be lost.
High white levels make the images on the screen appear vivid and lively. This makes the viewing more pleasant. Again, lot of people make a mistake by setting the white levels too high: this way certain details and bright highlights can be lost.
Important characteristics of the images on your display are color temperature, saturation and accuracy. 6500K, corresponding to daytime illumination, is the standard for color temperature. This is the natural light temperature. Everything above this is bluish, and everything below is yellow or reddish. If the color temperature is not set properly, every color will be bluish or reddish.
Color saturation can be relatively easily adjusted by using the color patterns that come with calibrations discs or TV channels. Color accuracy depends on how your HDTV decodes the image data. These are pretty complicated issues. You may want to read more about this elsewhere, but if you only want to stay at beginner-level, it is enough for you to know that the decoders of your system should match the color encoding used in film production.
Color reproduction is also affected by factors like greyscale and the display characteristic (gamma) of your TV. But this is beyond the beginner-level image calibration. If you find this is an important issue, you will have learn about image calibration, or you will have to pay a specialist to do this.
The latest HD resolutions provide 5 times more pixel amount compared to Standard Definition. As a result, image is not simply clearer, but there is night and day difference: the smallest detail can be noticed on the image. If you want to have the best, go for 1080 capable HDTVs.
Another notion related to resolution is percieved sharpness. This is very similar to the concept of edge contrast used in photography, and it basically means that users have the choice to make the image borders crispier. This gives the sensation of better image quality with the same resolution.
Edward McKellen is an HDTV expert who writes HDTV reviews for HDTVreviewlab.com. To check out the latest Samsung HDTV reviews or learn more about Plasma TV visit HDTVreviewlab.com
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