All that glitters is not gold

Purchase of the professional display
Do first, you need the display of that type?

Displays are different because of respects that is employed, and there are different functions, as to the user of one cad/cam, specially engaged in the image the user that dealt with one, the requirements for display are completely different. The display which the general family or individual used, because uses are diversified, so if require actually various functions are perfect, may not be be got at the general price, so a few display factory may offer applicable many kinds of uses, every kind of function products not so rigorous, for the user of general family to buy. So I sum up the display into three groups according to the real type of using.

The first group designs the clan for cad/cam, this kind of screen is specially applied to cad/cam, mainly used for revealing the accurate lines, require the steady display. The color used, the reappearing that the picture feels is expected much, so the demand for color accuracy is just not high, but to the definition of the lines, the signal is expected quite much steadily.

Second group clan, art designer of image, screen of type this, let user used for, engaged in image deal with mainly or art designer punish, must be used for exporting because of the image after dealing with, so that stressed is whether the color that the display reveals is correct and shutting the association. As for the importance of the detail is relative, it is unnecessary to be so strict to require, because the output that if color can be accurate, the requirement of the detail seems less important. So the requirement for the definition, so long as reach the general level, it has been already enough. And the requirement for the definition of this kind of display, simpler than the grasping of color, if we weigh a screen according to the definition again, seem a little too not grand enough, if a screen can’t meet requirements for this kind, it is here on the market not to appear.

The third group is a common display, this kind of display should possess the multi-functional characteristic, so require it is unreasonable that the single function of this kind of display is high-level. So we think this kind of display functions of various fields should reach certain level. Certainly we are very clear too, if require the behavior in various fields of a display, reach the perfect realm, this will be a super and expensive display. But various functions of this kind of requirement are absolutely perfect, in fact the main package characteristic with the display violates. So home display, will usually drop the requirements of various fields some, with comparatively moderate performance, come to reach consumers’ demand. (the above is a traditional crt display’s categorised way too)  .

As for the liquid crystal display, we really can’t be strict with the liquid crystal and reveal some excellent performance fully of utensil. Because except liquid crystal display protect eyesight, radiation little saving space, saving cable odd advantages, can’t really say that there is any special character again! If on the basis of the characteristic of the liquid crystal display, I can meet the requirement for the common type screen while thinking the liquid crystal display, it is a quite outstanding liquid crystal display.

Second, how to judge the quality of a display

As to the top-grade and specialized display, because of one’s own need and price reason, the behavior of performance is often concerned everybody. Then how should we judge the quality of the display quality of the display? I teach everybody briefly here how to test a display. As to the display, because we can not really judge whether the radiation standard of a display is shut in the technical specification in one’s own limitation, we only need to choose according to the normal sign, I mainly have a talk to mainly rely mainly on the fact that and eyes produce the project of function directly here –Weigh the good green bristlegrass of a display according to the display result that eyes see, so I lock the goal with eyes on the performance of acting on directly. The menu that the display performance of acting on eyes directly is the main display behaves. If you are considering choosing the professional display now, might as well follow my introduction method, and standardize authentication according to various that you need, to select the display which you need.

1,Display definition

While judging the definition of the display, I advise you to use resolution ratio 1024* 768, the breaking rate is 85hz vertically, the colour temperature of the screen is established in 6500k, use the display card above matrox g400. This kind of environment is established, mainly suppose 17 inches of traditional displays, generally all reveal under the mode of 1024* 768. It is 85hz to break frequency and establish vertically, under this kind of frequency of breaking, watches display eyes will be more comfortable. The colour temperature of the screen is established in 6500k, mainly consider and click and lie in this kind of colour temperature, accord with the common lighting apparatus colour temperature, and the colour temperature decided at the higher level but not officially announced of the operating system of the window. Certainly there is a few too among them unable to reach this kind of crt display which break frequency, breaking frequency vertically highest under adopting this mode.

And because lcd breaks frequency relatively low, I propose adopting 75hz and breaking frequency or breaking frequency vertically highest under 1024* 768 modes of the screen vertically. As for the special-purpose display of art designer of image, correct practice, should establish the colour temperature in 5000k, so the special-purpose display of art designer of image, carry on every test with the colour temperature of 5000k. Under this kind of colour temperature, can observe various details of the display and reveal performance respectively through various test figures of nokia monitor test 1.0a. (Attention: The display is when just starting the machine, the signal is unstable, so you advise you to start the machine in the display for more than ten minutes in advance, then just start and test. )

On definition to judge display, you can from following six point of judgements:

(1)The electron beam disappears

The electron beam of the screen disappears, main cause is by three electrons in the color of the screen, strike the mere material of firefly giving out light separately, because the energy of three kinds of electrons is different, deflection amount of electric magnetic field to control position might not same. Frankly speaking, aim at three kinds of different energy electrons with some, strike to different positions, the larger the difference of the position is, show the obscurity apt to cause the user of point that the display shows out. Because watch the difference of this kind with the ‘ one ‘, the result is not obvious, adopt three obvious natural colored lines traditionally, come, judge the position that electron beam bump into, well convergence of the electron beam, show red, green, blue three lines of color, can accurate aim at three lines of color can form more correct straight line then, if the lines of three kinds of color, obvious displacement appears, good with the lower one of intensity of displacement. While revealing, three natural colored lines are divided into competence and vertical direction and appeared, no matter in the horizontal direction or vertical direction, behave with lines coincident degree high for being good.

(2)Resolution ratio

We often use various resolution ratio to express the mode of revealing, on one hand these resolution ratios show the distribution situation clicked on the picture, on the other hand show the most careful result that can reveal too. Regard revealing the mode 1024* 768 as the example, if the full lines checkered with black and white are drawn on the screen, can draw 512 black lines and 512 white lines in the maximum number, each of lines width is a picture element. In this case, which see getting black lines and pale lines whose we are should can clear, if is unable to see, show it is too coarse that the cover of the display is hidden, the definition of the image picture.

(3)Water ripple

Water ripple means in the image which reveals the regular form, optics produced interferes the phenomenon, for example we, while revealing the regular vertical lines, we can see there is a phenomenon of level with the position in luminance. Certainly while revealing the image of horizontal lines or other regular form, there may be the same situation too. In case meet this kind of situation, better way is to reduce the resolution ratio of the screen, or can be a low frequency filter is hung in the front of display outside. And one good screen, can let the phenomenon lowest, let user with display of high-resolution, in order to obtain more careful display.

(4)Focus

A fine display is in the place of the corner, must focus on well equally. If present the fuzzy phenomenon in the place of the corner, cause and reveal in the image sharp degree is insufficient, may imply disappearing, higher phenomenon of resolution ratio wide and over and narrow revealing frequently of the image amplifier of electron beam at the same time. Because we carry on this kind of test under the same resolution ratio, so under the same resolution ratio, good with the good one focusing.

(5)Legible

The characters should be easy to read, should be quite clear in the edge part of the characters in case of display of the high contrast. Without the characteristic, say it is bad for display to focus, should reduce resolution ratio of revealing. Under the same resolution ratio, can clear person who appear good with characters.

(6)Stable degree of high pressure

Utilize the rectangle square of high contrast to reveal mutually, if the white edge of square of rectangle is unstable, or going beyond there should be ranges, show the high pressure stability of the display is insufficient, should reduce the luminance or contrast of the display, reduce the luminance of the background pattern, or use the color lower in luminance instead at this moment.

Through several steps of aspects, the display not doing well, must usually reduce luminance, contrast ratio even resolution ratio,etc., reduce what influence these have? The influence appears on level and detail of the graphical display mainly. If we reduce the output luminance of the screen, will oppress the dark department level in the picture, the bright dark level that can be represented is not obvious. Reduce contrast ratio, will make all level obvious, phenomenon these about eyes judge the result that the image reveal directly. Reduce the resolution ratio or use other darker color instead, let the result revealed less obvious. All these are not the phenomenon that a good screen there should be.

2,Measurement of screen color

How color behaves to go to measure examining about the screen, I mainly go on with two respects. First reflect for gray steps right, second color size of space. I propose using x-rite dtp92 cie colorieter, matching colorshop 2.6 that x-rite Company develops as weighing the main tool of color. (Certainly, it is impossible for general consumers to have so many to test tools! You can leave out this step)  Colorshop 2.6 that x-rite dtp92 cie colorieter can not merely match this company uses, it is a lot of screens that correct the standard instrument that the system adopts together at the same time, accuracy gets general approval in the world, it is I that propose the main reason to adopt this fund colorieter.

Note: Because of user one’s own limitation of terms, this step can use 6.0 photoshop too, reveal the same picture ” cmyk balloons.tif” ,To test color degree of saturation, soft degree of color that the display picture reveal, certainly this must see how your own color sense organ ability is.

3,Reveal the level

On the display of the screen, as to a user with special requirement the first question that expect should be revealing the level (generally speaking of the picture, the so-called level refers to, show the difference that color can demonstrate. ),The ones that can use the gray steps in level of the picture reflect it to measuring. Generally often hear the dark department level that others say is abundant, mean in the picture, darker part, even the original color difference only has a little, pass the display of the screen, our eyes can see clearly too, and the bright department level is the same meaning. The influence level large little, mainly influence and lie in the flexibility of the picture. The level is abundant, is a quite valuable speciality in the image, if the level is not obvious, the appreciative value of the picture will be reduced by a wide margin. It is believed that everybody has experience that watches the image on the screen, if the dark department level of the screen is on the low side, the black hair will be unable to demonstrate the feel, turn into great black class of one one click, so, it is quite important that the level is represented, can see how many things on behalf of you.

Attention: You at the level of testing, change to 1 value, gamma of output, of display card, let luminance and image luminance of materials that output present the linear relation. Then make use of monitor calibrator in colorshop 2.6 to adjust contrast and luminance of the screen, try hard to enable the screen to display the bright department level and dark department level at the same time. Utilize colorshop to read the function of color value, read the luminance that the screen displays, set as 1 with the largest luminance, the ones that draw screen luminance reflect the curve correctly.

About this curve graph, you should pay attention to carrying on the way of this curve, reflect it in the linear mode to adjusting because of outputting the display card, the color that the natural screen displays the linear increase is the most outstanding too.

A lot of unfortunate screens have no characteristic in this respect, the screen in order to be close to rising sharply in reading, it is a finer screen, show the all right user can protect to have than the great good elasticity, can apply flexibly to various output results.

4,The quantity of the space of color is examined

The quantity of the space of color was examined, has been an important speciality of the good green bristlegrass of display quality all the time, the display of color with bigger space, show that can show more colorful picture, for that the majority requires the user not rigorous, the picture is more colorful, usually show the appreciative value is a little higher. Especially used for regarding it as color video while exporting, the appreciative value that the chroma of the picture reveals from side to side. The high-quality screen will have larger color space, show the picture will be more colorful. Saying, usually adopt cie yxy color space and show, adopts this kind of expression method of space of color, because rgb color space and cie xyz or cie yxy color space appear linear to correspond to, so quantity examine red, green, blue 3 only while choosing, on this color space, the triangle drawn by these three points, is the color space that the screen can appear. The bigger this triangle is, show the greater a color space that can appear of the screen is.

This entry was posted on Wednesday, October 7th, 2009 at 10:31 am and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.