How can photography not post a simple talk about the impact of screen color gamut on post-retouching
I believe everyone has heard things like “It’s better to use a mobile phone if you don’t take a post-photograph; if you don’t take a post-photograph, it’s XXX;” these seemingly ridiculous remarks are actually saying that photography itself is composed of pre-shooting and post-processing. No one can do without a divided whole.
Regarding the later issue, if you want to expand, let’s talk about an article I’m afraid that the article is endless, so I will just talk about it briefly here, and we might as well start another article for more detailed discussion. If it is more true, all photos are a bunch of data, and when shooting devices such as mobile phones and cameras convert this bunch of data into pictures, they have already been processed, not really “straight out”. In fact, the “post” that many people dislike is the kind of composite photos that are adjusted to high contrast, high saturation, extreme sharpness, or directly stacking elements without creativity, and the post-processing of many excellent works is auxiliary expression The author’s creative intention is for the purpose. Both the color of the picture and the elements in the work are quite natural, so that the public has the idea of ”good work does not need post-production”.
What is color gamut
So post-processing is a tool to assist us in creating and expressing creativity, not a brush used to draw superfluous brushes. The author usually has some business trip tasks, even though he was a student My laptop can still support the job, but its weight is still too heavy for me. With the idea that it can also be used to retouch pictures during normal travel, I started the long journey of choosing a laptop. At the beginning, I thought very simple, except for the price, it’s all light. I didn’t expect to see a low price at first glance. There seem to be a lot of light and thin books, but a closer look reveals that there is a reason to be cheap. Excluding the processor, memory and other parameters, I will only talk about the issue of screen color gamut.
If you look closely at the product introduction, you will find that other configurations are more mainstream However, notebooks with relatively affordable prices generally describe screens such as “HD screen”, “2K”, “1080p”, and “bright colors” as a selling point. Regardless of screen resolution, it seems that they have no effect on the color gamut of the screen. For any detailed description, when you find the screen color gamut column in the parameters, you will find that it is basically 45% NTSC screen. After all, most people’s needs for the computer itself are greater than the requirements for the screen. This trade-off is understandable, and the same is true for desktop monitors and mobile phone screens, and the same is true for the screens of products in some price ranges.
Then we have to talk about the color gamut first. I don’t have a professional background, and I don’t want to be arrogant, but I still have to explain in order to continue the topic. Since it’s a simple chat, the author will naturally quote where it is necessary to quote professional explanations, and try to use simple and understandable Describe by description: Color gamut is a method of encoding a color, and also refers to the sum of colors that a technical system can produce. In computer graphics processing, the color gamut is a complete subset of colors. The most common application of color subsets is to accurately represent a given situation, such as a given color space or the color range of an output device. The “color gamut” here can be understood as a collection that converts colors into data and categorizes them. How many colors a screen can display depends on its color gamut.
Due to different standards, NTSC and sRGB are extended here For different color gamut standards, if you search the color space diagrams of several color gamut standards, you will find that they are not completely included. For example, NTSC cannot completely cover the sRGB color gamut range, but because of 100% The coverage area of sRGB is approximately 72% NTSC, so manufacturers and media mostly use 72% NTSC as a standard for evaluating screens. So far we can also draw a preliminary conclusion that photography enthusiasts should not consider buying a 45% NTSC screen. , And 72% NTSC and 100% sRGB and above screens are in the selection range.
Although the color gamut is used to judge the quality of a screen It is indeed a bit one-sided, but for the post-processing of photography, the color gamut range is obviously the primary condition of our choice. A good screen/monitor can display more color information, provide better color display and complete color gamut performance Although it is difficult to distinguish a more obvious difference on a screen above 72% NTSC due to the human eye, accurate color display is essential for photographers or professional designers.
and “wide color gamut” is a business invented according to user needs A word came out to allow users to intuitively understand the color gamut coverage characteristics of the screen. Its early color gamut standard is not the same as the color gamut standard it refers to now. For example, screens with 72% NTSC and above are now called ” “Wide color gamut”, however, is always the same. As long as the “wide color gamut” screens are produced in recent years, the color gamut will not be too bad.
The impact of screen color gamut on post-retouching
I’m talking about it again. Although I have said so much, it is all “cold” text after all. I learned about color gamut for the first time People with this concept must ask what effect the 45% NTSC screen and 72% NTSC screen have on the post-retouching. The 45% NTSC screen adjustment of the old computer is also very bright.
Having said that, I remembered talking to a photographer before At the time, he said something: “Numbers are not deceiving. It is better to adjust according to the changes of numbers than to adjust by the picture displayed on the screen. The color gamut is a collection of numbers, and each color has its corresponding. Numbers, RGB is not black, RGB is not white?” Although this statement is not rigorous, but it is a way to intuitively reflect the impact of the screen on the later stage of photography.
So here I can only make a less rigorous example , You can try to open Lightroom or Photoshop and other retouching software, as long as it can view the histogram. Load a picture or photo, observe the histogram and compare the pictures. If the histogram does not show that the picture is overexposed, underexposed or color overflowed, but you look at the picture on the screen that it is “too bright” or “too dark” “The color is not saturated enough”, “the color is not right” and other phenomena appear. This can be said to be a way to clearly feel the difference between 45% NTSC and 72% NTSC screens.
Another method requires you to have a 45% NTSC off-screen There is also a 72% NTSC screen, or a better mobile phone. First open Photoshop or drawing software, create a new file to fill with gradient color, here the author chooses a relatively simple black, gray and white gradient, interested readers can also try the color gradient, and then save the picture. Then open the gradient picture on another screen or mobile phone and compare it with the picture on the original screen.
The author’s perception is that no matter how you adjust the angle of the red frame in the picture, it is difficult to see the gradient effect on a 45% NTSC screen, while at 72% NTSC You can see a more obvious gradient effect on the screen. Due to problems such as color space file settings, the author’s picture in the article cannot be used as a criterion for judging your computer screen, but you can follow this method for simple comparison.
same picture Adjust to a similar look and feel on different screens
If you look at the same screen again, you will find two different styles
Imagine , If you perform post-processing on a 45% NTSC screen, the processed photos will naturally deviate from your original intention. If you have not overexposed but over-adjusted the exposure parameters because it looks too bright, the original intention is small and fresh. It instantly becomes a documentary style, or it becomes a high-contrast, high-saturated “fake photo” as mentioned in the previous article. Of course, some people will say that there are still many people who use 45% NTSC screens. I use 72% NTSC screens. It doesn’t make sense. First of all, if you are a professional photographer or to participate in competitions, then 45% NTSC screens obviously can’t help. You finish the creation, and secondly, even if you just post to Moments or social media, most people now use their mobile phones to browse social software. In recent years, the color gamut of most mobile phone screens is stronger than that of 45% NTSC screens, so you see Your photo is not necessarily a photo adjusted on your screen.
In short, the screen color gamut still has a very important effect on post-retouching Large, but as mentioned above, the color gamut is not the only criterion for judging the quality of the screen. There are even a series of parameters such as color cast and refresh rate that need to be considered, but just like the early and late stages of photography are inseparable. The “wide color gamut” screen will definitely help you better express your creative ideas in the later stage. The views in this article are only my humble opinion, and I hope it can be helpful to readers.
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