CN109856894A - The aobvious LED movies-making lamp of height and its color temperature adjusting method - Google Patents
The aobvious LED movies-making lamp of height and its color temperature adjusting method Download PDFInfo
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- CN109856894A CN109856894A CN201910267242.XA CN201910267242A CN109856894A CN 109856894 A CN109856894 A CN 109856894A CN 201910267242 A CN201910267242 A CN 201910267242A CN 109856894 A CN109856894 A CN 109856894A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000011324 bead Substances 0.000 claims abstract description 38
- 239000003086 colorant Substances 0.000 claims abstract description 31
- 238000009877 rendering Methods 0.000 claims abstract description 16
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012053 enzymatic serum creatinine assay Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- -1 white Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of high aobvious LED movies-making lamp and its color temperature adjusting methods, belong to video display lamp technical field, specifically include setting reference color temperature value；It is blended into the light of five kinds of white, red, green, blue, amber colors；When acquisition color temperature value minimum and when color temperature value maximum, the value of the color range degree of five kinds of light in light mixing；And the linear relation of colour temperature and color range degree is obtained according to linear interpolation method；Any colour temperature is finally selected, and obtains according to linear relation the theoretical value of the color range degree of white light under the colour temperature；The luminous color range angle value of LED lamp bead is adjusted to theoretical value, obtains light mixing；It realizes smooth light modulation of the colour temperature in setting range value, and accomplishes that colour rendering index is greater than 90%；Movies-making is fully met, aobvious refer to of the height of relay requires.
Description
Technical Field
The invention relates to the technical field of movie lamps, in particular to a high-display LED movie shooting lamp and a color temperature adjusting method thereof.
Background
The traditional high-power film and television shooting lamp mainly comprises a ceramic metal halide lamp and a halogen tungsten lamp, the fixed color temperature is 3200k or 5600k, and part of double-light-source lamps can be switched between 3200k indoor light and 5600k sunlight; in the industry of the recent 10 years, LED movie and television shooting lamps appear, but the LED movie and television shooting lamps are fixed in color temperature of 3200k or 5600k or single color, or are switched between 3200k and 5600k or are adjusted in color temperature step by step, two white light sources of 3200k and 5600k are adopted in nature to adjust the light, and color change and wider color temperature cannot be achieved.
Disclosure of Invention
Aiming at the defects in the technology, the invention provides the ultra-wide color temperature section high-display LED film and television shooting lamp, which adopts various LED lamp beads, and realizes smooth dimming of the color temperature between 2200 and 15000k by mixing other color lights on the basis of white light and linearly adjusting the mixing proportion of each color light and the brightness of the white light through a software algorithm.
In order to achieve the above object, the present invention provides a color temperature adjusting method for a high-display LED film and television shooting lamp, comprising
Setting a color temperature range value;
mixing the light of five colors of white, red, green, blue and amber; obtaining the values of the color gradation degrees of the five lights in the mixed light when the color temperature value is minimum and the color temperature value is maximum; obtaining a linear relation between the color temperature and the color gradation according to a linear interpolation method;
selecting any color temperature, and obtaining the theoretical value of the gradation of each color light under the color temperature according to a linear relation; and adjusting the luminous color gradation value of the LED lamp bead to a theoretical value to obtain mixed light.
Wherein, the luminous intensity parameter ranges of the five LED lamps are required to be obtained before the light with the five colors is mixed.
When the color temperature value is minimum and maximum, and the values of the color gradation of the five lights in the mixed light are obtained, the intensity of the four colors of red, green, blue and amber is respectively adjusted by taking the white light as the basic color, so that the color temperature reaches the minimum value or the maximum value.
Wherein, when the color temperature reaches the minimum value or the maximum value, the color rendering index of the mixed light is more than 90 percent.
When the intensities of the light with the four colors of red, green, blue and amber are adjusted, if the color temperature is higher than the target color temperature, the intensity of the light with the blue or amber is increased; or to reduce the intensity of the red or green light.
When the intensities of the light with the four colors of red, green, blue and amber are adjusted, if the color temperature is lower than the target color temperature, the intensity of the light with the blue or amber is reduced; or increasing the intensity of the red or green light.
After the lowest color temperature value CT1 and the highest color temperature value CT2 are obtained, a first data set and a second data set are obtained, wherein the first data set and the second data set are formed by the color levels of light of five colors, namely white, red, green, blue and amber; wherein the first data set is: (W1, R1, G1, B1, a1), the second data is: (W2, R2, G2, B2, A2).
When a linear relation between the color temperature and the color gradation is obtained according to a linear interpolation method, a coefficient group is obtained firstly:
when any color temperature CT3 is obtained, a third data set consisting of the color gradation values of the light with five colors of white, red, green, blue and amber is as follows:
(W3, R3, G3, B3, A3); wherein,
when the luminous color gradation value of the LED lamp beads is adjusted to a theoretical value, the luminous intensity of the LED lamp beads is adjusted by adjusting the power of the light beads with the five colors, and the theoretical value of the color gradation of each type of lamp beads is changed.
In order to achieve the above object, the present invention further provides a high-definition LED film and television photography lamp for performing the color temperature adjustment method as claimed.
The invention has the beneficial effects that: the invention comprises setting a color temperature range value; then mixing the light of five colors of white, red, green, blue and amber; obtaining the values of the color gradation degrees of the five lights in the mixed light when the color temperature value is minimum and the color temperature value is maximum; obtaining a linear relation between the color temperature and the color gradation according to a linear interpolation method; selecting any color temperature, and obtaining the theoretical value of the gradation of each color light under the color temperature according to a linear relation; adjusting the luminous color gradation value of the LED lamp beads to a theoretical value to obtain mixed light; smooth dimming of the color temperature within a set range value is realized, and the color rendering index is larger than 90%; the high-definition digital requirement of film and television shooting and rebroadcasting is completely met.
Drawings
FIG. 1 is an overall flow chart of the present invention;
FIG. 2 is a flow chart of an interpolation method of the present invention.
Detailed Description
In order to more clearly describe the present invention, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, a color temperature adjusting method of a high-definition LED film and television shooting lamp, first setting a color temperature range value; then mixing the light of five colors of white, red, green, blue and amber; obtaining the values of the color gradation degrees of the five lights in the mixed light when the color temperature value is minimum and the color temperature value is maximum; obtaining a linear relation between the color temperature and the color gradation according to a linear interpolation method; finally, any color temperature is selected, and the theoretical value of the gradation of each color light under the color temperature is obtained according to the linear relation; and adjusting the luminous color gradation value of the LED lamp bead to a theoretical value to obtain mixed light.
In this embodiment, before light of five colors is mixed, the ranges of the light emitting intensity parameters of five LED lamps need to be obtained; specifically, the obtained parameters of the LED lamp are the color level values of the brightness of the LED lamp; the color gradation value of the brightness of the five kinds of lamp beads is 0-255; according to the range requirement of color temperature, before the LED lamp is selected to be dimmed, the LED lamp bead with the color gradation value of each color lamp bead in a certain range can be selected, wherein the meaning of the color gradation is the ratio of the current color gradation value to the maximum color gradation value 255, and then the value is multiplied by 100%.
In the prior art, red, green and blue are three primary colors of light; the three lights are mixed together according to a proportion to obtain lights with any color; for example, when pure red light is required, the gradation value of red light is 255, and the gradation values of green light and blue light are both 0; when white light is needed, red light, green light and blue light with 255-degree color level values are mixed together; when the color is black, the color level values of the red light, the green light and the blue light are all 0; in the embodiment, the red, green, blue, white and amber lights are respectively emitted by the LED lamp beads of the respective light sources, wherein color deviation exists between the light actually emitted by the 5 color lamp beads and the light mixed by the theoretical value; this leads to deviations in the subsequent colors if the colors are directly demagnified according to the theoretical values; therefore, the actual color level values of the colors at the maximum color temperature and the minimum color temperature need to be measured, and the accuracy of the subsequent color temperature adjustment is ensured.
In this embodiment, when obtaining the color temperature value minimum and the color temperature value maximum, and when obtaining the color gradation values of the five lights in the mixed light, the intensity of the four colors of red, green, blue, and amber is adjusted respectively based on the white light, so that the color temperature reaches the minimum value or the maximum value; in the embodiment, white light is a basic color, red, green and blue are used for adjusting color temperature on the basic color, and amber is used for complementing color; wherein, when the color temperature reaches the minimum value or the maximum value, the color rendering index of the mixed light is more than 90 percent; in the adjusting process, when the intensities of the light with the four colors of red, green, blue and amber are adjusted, if the color temperature is higher than the target color temperature, the intensity of the light with the blue or amber is increased; or reducing the intensity of the red or green light; if the color temperature is lower than the target color temperature, reducing the intensity of blue or amber light; or increasing the intensity of the red or green light; adjusting the light intensity of four colors; during adjustment, the color temperature value is kept unchanged, and the intensities of the red, green, blue and amber lights are changed one by one until the color rendering index is larger than 90%.
Referring to fig. 2, a first data set and a second data set composed of the color levels of the light of five colors, white, red, green, blue and amber, at the lowest color temperature value CT1 and the highest color temperature value CT2 under the condition that the color rendering index is greater than 90% are respectively obtained; wherein the first data set is: (W1, R1, G1, B1, a1), the second data is: (W2, R2, G2, B2, A2); when a linear relation between the color temperature and the color gradation is obtained according to a linear interpolation method, a coefficient group is obtained firstly:when any color temperature CT3 is obtained, a third data set consisting of the color gradation values of the light with five colors of white, red, green, blue and amber is as follows:
(W3, R3, G3, B3, A3); wherein,
and finally, adjusting the luminous color gradation value of the LED lamp bead to a theoretical value, specifically, adjusting the luminous intensity of the LED lamp bead by adjusting the power of the light beads with the five colors, and changing the color gradation value of each lamp bead.
In the present embodiment, the range of color temperature is 2200K to 15000K; when the color temperature is 2200K, the mixed light of the movie and television lamp is like the light of the sun which is just raised in the morning, and when the color temperature is higher than 6500K, the mixed light is blue like the light scene of ice, snow and land; on the basis of the white light color rendering index Ra80, by mixing other color lights, the mixing proportion of each color light and the white light brightness is linearly adjusted, thereby realizing smooth dimming of the color temperature between 2200-15000k, particularly realizing the average color rendering index Ra95 between 3200k-5600k most commonly used shooting color temperature sections, and leading the partial color temperature to reach Ra 97.
In this embodiment, the five kinds of beads, white, amber, red, green and blue, are all beads of CREE brand XBD model; wherein, the white light bead is warm white, the color temperature is 3000K, the display index is more than 80, and the lumen range value is 67.2-107 lm; the light-emitting wavelength of the amber lamp bead is 593.6 nm-596 nm, and the lumen range value is 56.8-73.9 lm; the luminous wavelength of the red lamp bead is 620 nm-630 nm, and the lumen range value is 51.7-73.9 lm; the luminous wavelength of the green lamp bead is 520nm to 535nm, and the lumen range value is 87.4 lm to 114 lm; the luminous wavelength of the blue lamp beads is 465 nm-485 nm, and the lumen is 30.6-39.8 lm; in the whole movie lamp, the number of white lamp beads is 72, the number of amber lamp beads is 6, the number of red lamp beads is 12, the number of green lamp beads is 24, and the number of blue lamp beads is 18; in particular, the method comprises the following steps of,
in the present embodiment, the color temperature is 2200K, the first data set is (56.8%, 100%, 0, 0, 100%), and the display index is Ra 96; at a color temperature of 15000K, the second data set is (33.3%, 0, 100%, 96.1%, 0) and exhibits an index Ra 90; existing film and television lamps typically exhibit indices of R82-R87; the color rendering capability of the light source on the object is called color rendering, and is obtained by comparing the color of the object with the appearance color of a reference or reference light source with the same color temperature, wherein the reference light source refers to an incandescent lamp or a picture light; if a light source with high color rendering index (Ra) is required to be used for correctly representing the original color of the substance, the value is close to 100, and the color rendering property is best; the mixed light display index obtained by smoothly adjusting the color temperature by adopting the interpolation algorithm is close to Ra100, and the color rendering effect is obviously better than that of the prior art.
In the present embodiment, the coefficient group:
W3＝56.8*10^-2-1.84*10^-5*(CT3-2200)；
R3＝100*10^-2-7.8*10^-5*(CT3-2200)；
G3＝0*10^-2+7.8*10^-5*(CT3-2200)；
B3＝0*10^-2+7.5*10^-5*(CT3-2200)；
A3＝100*10^-2-7.8*10^-5*(CT3-2200)；
taking the value of CT3 as 5200K, W3 ═ 51.28%, R3 ═ 76.6%, G3 ═ 23.4% were obtained; b3 ═ 22.5%; a3 ═ 76.6%; the product of W3 and 255 is the theoretical color level value of white light, and the color level values of other beads in No. 4 can be obtained in the same way; and controlling the color gradation value of each lamp bead to obtain a mixture of 5200K color temperature, and the display index is Ra 93.
In this embodiment, a high-display LED film and television shooting lamp is further provided for executing the color temperature adjusting method; the light output of full color and high color rendering index is realized; built-in contextual models such as explosion, fire, lightning, warning lights, party and the like are realized by utilizing an autonomous development circuit and software, and three lamp control modes can be realized by combining a key control panel and wireless and wired remote controllers on the lamp; through the DMX512 protocol, a console can be externally connected to realize multi-lamp synchronization and control.
The invention has the advantages that:
1. firstly, setting a color temperature range value; then mixing the light of five colors of white, red, green, blue and amber; obtaining the values of the color gradation degrees of the five lights in the mixed light when the color temperature value is minimum and the color temperature value is maximum; obtaining a linear relation between the color temperature and the color gradation according to a linear interpolation method; selecting any color temperature, and obtaining the theoretical value of the gradation of each color light under the color temperature according to a linear relation; adjusting the luminous color gradation value of the LED lamp beads to a theoretical value to obtain mixed light; smooth dimming of the color temperature within a set range value is realized;
2. during dimming, white light is used as basic color, red, green and blue are used for adjusting color temperature on the basic color, and amber is used for complementing color; wherein, when the color temperature reaches the minimum value or the maximum value, the color rendering index of the mixed light is more than 90 percent; the high-definition digital requirement of film and television shooting and rebroadcasting is completely met.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. A color temperature adjusting method of a high-display LED film and television shooting lamp is characterized by comprising the following steps
Setting a color temperature range value;
mixing the light of five colors of white, red, green, blue and amber; obtaining the values of the color gradation degrees of the five lights in the mixed light when the color temperature value is minimum and the color temperature value is maximum; obtaining a linear relation between the color temperature and the color gradation according to a linear interpolation method;
selecting any color temperature, and obtaining the theoretical value of the gradation of each color light under the color temperature according to a linear relation; and adjusting the luminous color gradation value of the LED lamp bead to a theoretical value to obtain mixed light.
2. The method for adjusting the color temperature of a high-definition LED film and television shooting lamp as claimed in claim 1, wherein the ranges of the parameters of the light intensities of the five LED lamps are acquired before the light of the five colors is mixed.
3. The method for adjusting the color temperature of a high-definition LED movie and television shooting lamp according to claim 1, wherein when the color temperature value is minimum and maximum, and the values of the color gradation of five lights in the mixed light are obtained, the intensities of the four colors of red, green, blue and amber are respectively adjusted by taking the white light as the basic color, so that the color temperature reaches the minimum value or the maximum value.
4. The method for adjusting the color temperature of a high-definition LED film and television shooting lamp as claimed in claim 3, wherein when the color temperature reaches the minimum value or the maximum value, the color rendering index of the mixed light is larger than 90%.
5. The method for adjusting the color temperature of a high-definition LED film and television shooting lamp as claimed in claim 3, wherein when the intensities of the lights with the four colors of red, green, blue and amber are adjusted, if the color temperature is higher than the target color temperature, the intensity of the light with the blue or amber color is increased; or to reduce the intensity of the red or green light.
6. The method for adjusting the color temperature of a high-definition LED film and television shooting lamp as claimed in claim 5, wherein when the intensities of the lights with the four colors of red, green, blue and amber are adjusted, if the color temperature is lower than the target color temperature, the intensity of the light with the blue or amber color is reduced; or increasing the intensity of the red or green light.
7. The method of claim 1, wherein a first data set and a second data set are obtained, wherein the first data set and the second data set are composed of the color levels of the light of five colors of white, red, green, blue and amber after the lowest color temperature value CT1 and the highest color temperature value CT 2; wherein the first data set is: (W1, R1, G1, B1, a1), the second data is: (W2, R2, G2, B2, A2).
8. The method for adjusting the color temperature of a high-definition LED film and television shooting lamp as claimed in claim 7, wherein when the linear relation between the color temperature and the color gradation is obtained according to a linear interpolation method, the coefficient set is obtained first:
when any color temperature CT3 is obtained, a third data set consisting of the color gradation values of the light with five colors of white, red, green, blue and amber is as follows:
(W3, R3, G3, B3, A3); wherein,
9. the method for adjusting the color temperature of the high-definition LED movie and television shooting lamp according to claim 1, wherein when the color gradation value of the light emitted by the LED lamp bead is adjusted to a theoretical value, the power of the light beads with five colors is adjusted to adjust the light emitting intensity of the LED lamp bead, and the theoretical value of the color gradation of each lamp bead is changed.
10. A high-definition LED film and television photography lamp, characterized by performing the method of adjusting the color temperature according to any one of claims 1 to 9.
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Cited By (1)
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