Por que é importante calibrar a imagem do monitor?

Why is monitor image calibration important? – Hardware.com.br

I don’t know if you have the opportunity to see the same image displayed on two different screens or TVs, placed side by side. It is easy to notice that the color tone is slightly different. Some screens display images with more saturation, others with more muted colors, and some tend to show yellow or bluish images.

These inconsistencies in the display of images are mainly due to Screen calibration. There are other technical aspects involved, such as the type of panel used (TN, IPS, AMOLED, etc.). But the main factor is really the calibration of the monitor or TV.

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In this article, I’ll show you why screen image calibration is important. Especially if you work with photos. This is the case for photographers, video editors, and designers.

Why is monitor calibration important?

Screen image calibration is especially important for those who work with images. Photographers, video editors, designers, illustrators, and other industry professionals need to calibrate their monitors well. This is not only a requirement for them to be good professionals, but it also avoids a lot of problems.

I will give only one example. Imagine you are a wedding photographer. After completing all of the event filming work and editing the photos chosen by the couple, she sends the files to the printer to assemble the album. When you reach your hands, you are faced with yellow or bluish images. Only then do you discover that your monitor is out of calibration and you ended up with hours upon hours of hard work.

Now all you have to do is calibrate the screen, redo all the work, and try to deliver the photos on time. In other words, an almost impossible task. Monitor calibration is intended to ensure that the colors you see on the screen are the same as the colors you see in print..

What if a professional doesn’t work with printed photos? However, it is important to calibrate the monitor. This way you ensure that your work is seen as accurately as possible.

How do I know if my monitor has been calibrated correctly?

The easiest way to do this is to analyze the highlights (white), shadows (black), and contrast of the images. Fortunately, there is a very simple way to do this check.

Highlights

Take a closer look at the image above. It is divided into eight blocks in shades of gray with a white stripe in the middle, where we read “White Point Checker for Photography ResourcesNote that each block has a number. Indicates that each block contains the same amount of red, blue and green pixels. The difference in numbers results in different shades of gray.

Ideally, you should be able to distinguish the boundary between the central white line and each block. On a perfectly calibrated screen, you can see the difference in tone between the white line and the 254 . block. On a screen with an OK calibration, you can easily discern the difference in tones between the white line and the 250 and 251 blocks.

shadows

Now let’s do a similar test, but to check the calibration of the shadows (black dots). However, in order to perform the test properly, You need to make your room as dark as possible. Turn off the lights and/or close the windows.

Then download that image and open it in an image editor such as Photoshop, Lightroom, or any other editor of your choice. The idea is to notice the image on a black background.since the white background can also interfere with the correct perception of shadows.

Then, let’s start the test. The perfectly calibrated screen allows you to see the split between the black center line and the 5 . square. This is the block with the color closest to the central bar, but it’s not the same color. On the other hand, the OK screen allows you to see the partition up to block 15. On the other hand, screens with unadjusted calibration allow you to see only the block 30 split.

variance

Finally, we come to the contrast component, which is also important when we talk about color calibration. This time the test will be a little different. Look at the picture below:

The square in the center of the picture is nothing more than several alternating black and white lines.. However, if your screen contrast is well calibrated, instead of seeing black and white lines, you’ll see a file Patterned in the same shade of gray as the outer surface of the box. Especially when you look at the picture from a distance or when you try to blur your eyes.

If a lot of black and white lines still appear, it means that Your screen is not properly set to 2.2 Gamma. This color gamut is used by the vast majority of monitors that use the sRGB color standard. Unfortunately, adjusting this aspect will require the use of a monitor calibration tool. By the way…

Can I calibrate the monitor “in the eye”?

The short and dense answer is number! At least not a perfect calibration. You can even try to calibrate the colors in the eye, but you will likely be fooled by it. Or rather through the brain. Since we are so used to identifying patterns, our brain is often easily fooled.

Look at the image below and answer me if the color of square A is the same as the color of square B.

Obviously not, right? After all, square A is gray and square B is white but under the cylinder’s shadow.

Wrong – wrong – wronged! Bad mistake, bad mistake! Download the image to your computer and open it in the image editor. Using the color swatch tool, view the color reference. In both hexadecimal and RGB, you will see that all the squares have the same color.

If you don’t have a photo editor there, go to the site Image color picker, load the shape and see the color code of the board. In fact, even the green cylinder has the same color! Congratulations your brain is deceiving you!

Therefore, to professionally calibrate your monitor, you will need professional equipment. The most common are . files colorimeter it’s the Spectrophotometer.

Does the notebook screen also need to be calibrated?

Yes, it should be. As long as you use your notebook at work, of course. Many professionals have a desktop computer for studio work and a laptop for working outside. Sometimes you are traveling or covering an event abroad and need to use your notebook.

To preserve the visual quality of your work and avoid the problems mentioned in the first topic of the article, it is interesting that the notebook screen is also calibrated. thus, You will maintain quality and standard in your work no matter where you are.

However, it should be noted that the screen of some laptops, especially the cheapest ones, does not have this high quality. See the notebook technical sheet and If it contains a TN panel (filiform twisted) is already ignored as a connection option. The best laptops for those who work with photos are those that use an IPS panel. Too bad these models are more expensive.

Do not calibrate just once

Another mistake many people make is to think of calibrating the monitor once and that’s it, the problem is fixed forever! Unfortunately it is not. With use, the screen calibration becomes out of adjustment, which makes it necessary to do so Repeat the process from time to time. But how often should I calibrate the monitor? The answer to this question depends on several factors.

For example, if the monitor is less than 3 months old but has been used in a printing studio or for long hours during the day, it should be calibrated once a week. But if you only use it for photo editing, you can calibrate it every 3 months. And after one year of use, the process should be done monthly.

For slightly older screens with more than 3 years of use, it is recommended to calibrate them every 2 weeks. Of course, these times are estimates. Each manufacturer and each monitor model has its own specific time to calibrate.

conclusion

As you can see throughout the article, monitor calibration is very important. More so if you work with photos. This is an operation that cannot be performed on the eye, let alone lost.. It is necessary to use professional equipment and to repeat the process at least once a month.

Therefore, it is not difficult to conclude that monitor calibration is more important for photographers, video editors and other audiovisual professionals. For regular users, I dare say you shouldn’t worry too much about this point.

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