PS CS Photo Filter photo filter: Color temperature

Filters | detailed

Photoshop CS provides "photo filter/photo Filter", a lot of friends are very interested in this is not aware of the specific usage, here we will be together to see the details of this "photo filter/photo Filter" in the end how to use. In the previous section we introduced a description of "Photo Filter/photo Filter" in the Help document with Photoshop CS, which involves a lot of professional terminology, and we'll take a closer look at this section.

Color temperature filters for traditional cameras

Anyone who has ever played a traditional camera should be aware and understand that a photographer often has a color temperature (what is the color temperature?). To put it simply, the picture is blue, the color temperature is high, the photo is red, the color temperature is low. Control always feel uneasy and headache. All kinds of light color temperature value! Calculate the color temperature value! When and where to use what type of film! It's always a pleasure to be photographed.

Now is the era of digital, digital technology let us once again be liberated. Photoshop CS version of the function of the update, but also to the photography enthusiasts once again intimate care. The "Photo Filter/photo Filter" command, more highlighting PS to the photographer later photo processing convenient and quick!

When we use the traditional camera to shoot the scenery, if we find that the color of the scenery is warm, we will be in front of the camera lens plus a Kodak Ryden 82nd cold Color Rise temperature compensation filter, to slightly adjust, or with the Kodak Ryden 80th Cold color rise color temperature conversion filter. If we find that the color of the scenery is cold, we will add a Kodak Ryden 81st warm color Color temperature compensation filter in front of the camera lens to adjust it slightly, or convert it by using the Kodak Ryden 85th warm color drop color conversion filter. If we feel that there will be a slight color deviation in the scene, we will add a color compensation filter in front of the camera lens for minor adjustments.

Note: Color temperature filters are divided into color temperature conversion filters and color temperature compensation filters. Color temperature filters and color compensation filters are not a concept Oh!

and Photoshop CS New "Photo Filter/photo Filter" command is equal to the traditional photography of the color temperature filter and color compensation filter. You can also customize the color compensation filter. You don't have to pay for these camera accessories! Save it! Ha ha!

Clear is clear, but how to use it specifically? What does the argument in this command dialog box mean? Which one do I want to choose to be right!? Please listen to me in one by one ways!

In Photoshop CS Open the image you want to process, select the "Photo Filter/photo Filter" command, pop-up its dialog box. There are very few adjustment parameters in the dialog box Oh! As we know from the above explanation, these parameters are the same as the usage of traditional photographic filters, and are relative.

We clicked on "Filter/filter" to the right Drop-down list and popped up with 18 different filters.

In order to facilitate the reading, we have made a bilingual form. The top four are the Kodak Ryden color temperature filters, and the last 14 are color compensation filters. Let's talk about what is "color temperature" in detail below.
what is the color temperature

Before we talk about these two filters, we need to find out a professional noun: color temperature.

Start talking about theory, and you should be prepared for it. It will be more difficult to understand and I will try to make it clear and interesting. The theory of color temperature is very important to photography, you do not understand, you have no understanding of PS in the photo filter command. So please watch patiently and you will reap a lot!

The temperature of color, colour and colors. What the? Color and temperature? Of course. Color also has temperature.

What is the color temperature? The color Wen Quan is called Kelvin temperature, the unit of color temperature is k, namely Kelvin, Kelvin. And we Chinese usually use the Celsius temperature, and the American use of Fahrenheit, as the temperature is a unit of measurement. But the color temperature is a description of the temperature of the light.

0 Kelvin is equivalent to 459.67 Fahrenheit temperature.

That is, the so-called color temperature-that is, to quantify the Kelvin temperature.

In order to facilitate the comparison of different spectral components, the selection, adjustment of control conditions and chroma calculation in some applications, usually using color Win Lai to express the spectral characteristics of illumination light source.

The method used to calculate the color components of light was created by the British physicist Lord Kelvin in late 19th century, and he worked out a set of color temperature calculations, which were based on the wavelength emitted by a blackbody radiator.

The relationship between the color and Kelvin temperature originates from the blackbody radiation theory, which heats the blackbody (which absorbs all visible light) until it glows (like heating iron), and the color at different temperatures is the colour temperature.

The black body from absolute zero (15 degrees Celsius minus 273 points, reminds me of the Holy Warrior Glacier) began to warm up, the temperature per elevation was once called 1 Kelvin (with the letter K) when the temperature rises to a certain extent, the blackbody radiation from visible light, Its spectral composition as well as the feeling of the person will change correspondingly as the temperature increases. As a result, the blackbody radiation of a certain shade of the temperature as the emission of the same light source color temperature.

When this black object is heated by the heat of the equivalent of 500-550 degrees Celsius, it will turn dark red, if you continue to heat up to 105,011,150 degrees Celsius, it will turn yellow, then white, and eventually blue.

When the temperature of the black object reaches 3200 kelvin, it emits a red light, which is also emitted by the tungsten filament of the incandescent lamp we normally use. When the temperature rises to 5500 Kelvin, the black object will pale light, which is equivalent to the midday sun, and the light blue light We see at dawn is about the same intensity as that of the 12000 Kelvin black object.

The color composition of the light source corresponds to the thermal temperature of the blackbody. But the color temperature is expressed in Kelvin (K) color temperature units, not in Celsius units.

In the process of iron, the black metal gradually turns red in the stove, which is the best example of blackbody theory.

Usually the tungsten filament in the bulb we use is equivalent to this blackbody.

The color temperature calculation method is based on the above principle, using K to express the temperature of light emitted by the heating tungsten wire.

According to this principle, any light color temperature is the equivalent of the above blackbody powder to emit the same color when the "temperature".

So now we're going to follow one of the Kelvin theories, which we can deduce:

The higher the temperature, the more blue the composition, the image will be blue;

The lower the temperature, the more red ingredients, the image will be red.

Through the above explanation, I think we should understand and understand the concept of color temperature.

What is the relationship between color temperature and photography? What does Photoshop have to do with "photo Filters"?

I remind you that photography is the art of dealing with light and shadow, and the color temperature is the symbol of spectral characteristics of light source! So in the field of photography, light sources are defined according to their color temperature. So the two are combined. Became a professional term for photography.

Color is actually a psychological physical role, all the color impression is due to the time of the continuous spectrum in the eyes of the reaction, so the color temperature is only used to represent the visual impression of colors.

Because light is emitted from light sources at different temperatures, the same color behaves differently in different environments, which increases the number of factors to be considered in the camera's shooting process.

For traditional cameras, it is possible to choose a different film (color film design, is generally based on a true record of a specific color temperature of the light source lighting, divided into 5500K daylight, 3400K strong lighting and 3200K tungsten type of variety. Plus some filters to adjust the color temperature.

Therefore, we must know how to use the same color temperature with the same colour film, will be accurate color reproduction. If the color temperature of the light source and the color temperature of the film are unbalanced, it is necessary to rely on the filter to promote or reduce the temperature of the light source, so that with the film fixed color temperature matching, will have accurate color reproduction.

Color temperature and white balance of digital camera

In a digital camera, there is no film, so how to deal with the problem of color temperature?

This will refer to the digital camera's proper noun "white balance". The concept of white balance is not in the traditional camera. Because the traditional film photosensitive has been fixed, only the CCD in the photosensitive element only, is generally automatic control, but as a professional with the best manual white balance control function, so that the color of the scene more accurately reproduce.

The so-called white balance, is the camera on the restoration of white objects. When we look at this colorful world with our eyes, in different light, the feeling of the same color is basically the same, such as in the morning sunrise, we look at a white object, feel it is white, and we in the dim light of the night, see the White object, feel it is still white. This is because we humans from the birth of the process, the human brain has been different light objects in color reduction has adaptability.

However, as a camera, can not be the adaptability of the human eye, in different light, due to the unbalanced CCD output, resulting in the camera color reduction distortion: specific to the shooting of white objects when the performance is not blue, is biased red, resulting in the entire image color distortion.

Therefore, if the light of the irradiated object changes, then the reflected color will also change, and this change reflected in the camera, it will produce in different light color reduction of different phenomena.

For the digital camera is the white balance of the problem is the color temperature problem, the traditional camera for the color temperature of the problem is the problem of film and filter.

What if we take a picture that is biased?

Through the above explanation, we have understood the concept of color temperature, then the simplest way to identify is: according to the color temperature theory, the red color is low, the blue color is high.

Workaround:

1, adjust the digital camera temperature control switch correctly or set the corresponding light switch on the digital camera correctly, adjust the white balance correctly.

2, for the traditional camera, is the correct choice of film, and add filters.

We do not use the camera now, but also want to add a filter to do processing, then use the PS command to the traditional camera with filters or set the digital camera white balance it!