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Written by Administrator
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Saturday, 16 August 2008 21:41 |
Screen Resolution
Higher screen resolution doesn't mean better image quality (or clarity). The quality of a certain image is a constant no matter what the screen resolution is.
The same image is displayed (appears) smaller on a high resolution screen than on a low resolution screen.
For example:
Let's say you have a 17 inch screen (10.2 in. x 13.6 in.). Let's consider 2 options:
Option 1 - the screen resolution is 600 x 800 pixels. In PPI - 600/10.2 (=800/13.6) = ~ 59 PPI.
Option 2 - the screen resolution is 960 x 1280 pixels. In PPI - 960/10.2 (=1280/13.6) = ~ 94 PPI.
Let's say you have a 600 x 800 pixels image.
In the first option the image will take up the entire screen height and width (in full screen).
In the second option it will take up only 600/960 (=800/1280) thus 62.5% of the screen's height and width (0.62 x 0.62 = ~ 40% of the screen area).
Some softwares fit the image to screen or to a window or to a sertain size on the screen but some fit the image resolution to the screen resolution i.e. there is a screen pixel for every image pixel and this results in an enlargement or a reduction of the image on the screen as a function of the screen resolution (and/or as a function of the resolution of the picture itself).
But there is more to it, you might ask: so, why am I seeing an image less clear on a low resolution screen? The explanation for this is simple:
The clarity or sharpness of any image that consist of pixels or any sort of a grid depends on the combination of 2 factors:
1. The density of the grid (PPI).
2. The distance from which we look at the image.
For a human eye for a distance of approx. 1 ft. (~ 30 cm), pixels 1/128 of an inch (~ 0.2 mm) in size will give us a clear and sharp image.
A 600 x 800 pixels screen is not enough for this matter. A 960 x 1280 screen is optimal for a distance of 1 - 2 ft.
More important facts:
1. The farther our distance is from an image the larger the pixels can be (lower resolution or lower PPI) in order for as to see what seem to us as a sharp image. This fact is true for prints of all sizes as well as for computer screens T.V. screens etc.
2. With no relation to the screen size and resolution it is recommended to whach the computer screen from a distance of ~ 2 1/4 ft. - 2 1/2 ft ( ~ 70 - 80 cm).
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Last Updated on Friday, 31 October 2008 11:15 |