How to test the mouse DPI?

The ibm lenovo thinkpad x200 laptop keyboard mouse only quantitative index is the interpretation of the degrees, explain degree also called resolution, and image correlation is an important concept, it is a measure of the technical parameters of image detail expressive force. But the explanation degree type has a lot of, its meaning is different. Explain degree with each inch can be produced on the points that DPI (DotsPerInch) to measure. To explain degrees from three aspects to determine: optical parts, hardware and software part. But the mouse explanation degree and no special software to measure, light see manufacturers released by the numerical are not reliable. So this time we design a new scheme to test the performance of the mouse. A brief introduction of steps:

1, on a piece of white paper on 2 cm draw a straight line, don't think 2 cm distance is very short, this 2 cm with the mouse reaction on the screen distance is ibm lenovo thinkpad x201 laptop keyboard almost 20 cm! (for ease of measurement, the display USES a 800 x600x16bit resolution.

2, open Photoshop, create a new blank documents, size for 500 x1200 pixel.

3, choose 9 pixel brush to draw down the mouse movement trace (with a square box pressure online on boundary, in case the mouse go wide), then carefully and uniform to school official cites use the mouse to carry off over the line.

4, finally use Photoshop scale measure off the mouse pointer on the screen moving distance.

5, this distance reflect the mouse explanation degrees, the ibm thinkpad t41p 2669 laptop keyboard mouse to explain the degree, the corresponding pointer on screen moving distance is bigger also.

What say here can be observed the change of the screen, can be cursor movement one (or N) pixels, also can be in FPS game turned to 10 degrees. This change can be made by the mouse drive or software (game) Settings to change, but one of the most basic, the most subtle change can only be cursor movement 1 pixel. We discussed here is 1 pixel change. But the mouse must move minimum distance, is the reciprocal DPI. If the mouse is 200 dpi, then the ibm thinkpad t60 laptop keyboard mouse A must move 1/200 inch, screen cursor movement 1 pixel. And the other one each 800 dpi mouse B, simply moving 1/800 inch, the cursor can move 1 pixel.

This is the first layer in the sense of precision difference, is the mouse to tiny moving response ability. When the mouse B moved 1/200 inch, screen cursor can move four pixels. The show as A result of which the mouse B cursor movement speed is faster than the mouse A 4 times (by this time the mouse itself movement speed is the same). So in the samsung n128 laptop keyboard same mouse movement distance, DPI value low mouse A can obtain higher cursor movement speed? (note, is the cursor speed)?

Of course no problem, drive to an accelerated went. A not mobile 1 pixel, but four pixels, then it can and mouse B the cursor movement speed. But the new problem and produced, mouse 1 itself fast moving may also can't see, when the mouse moves slowly, you will find the mouse on the screen cursor always only in a multiple of 4 number of pixel stay, the mouse cursor beating the mobile. This is the second in the sense of precision difference,samsung n140 laptop keyboard is the mouse to the screen pixels control ability. So high DPI mouse, can be made by small operation get high response, and at the same time maintain a high level of pixels control ability.



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