What is the diffrence between conventinal and LED approach?
Answers
Answer:
It can definitely be a problem, especially if the LED lights in question are not white LED lights. White LED lights, at least the higher quality ones, put out enough red, green, and blue light to work fairly well for most cameras. The results might not be as ideal as a fuller spectrum light source, but you can usually get pretty close. Typical high quality white LEDs put out a stronger blue channel than red or green. Red is usually stronger than green at the wavelengths to which many cameras are most sensitive to red and green respectively. Depending on the exact colors of the filter on your camera's Bayer mask, you'll probably have to pull back blue and boost green to get the colors looking more natural.
The problem is that not all white LED lights put out enough red and/or particularly green light in the part of each of those bands to which digital cameras are most sensitive. When that is the case it becomes an issue if you want to remove color casts that were in the scene when you post process your images.
Shooting under traditional incandescent lights with a color cast is less of a problem because even when they have a strong color cast they are usually putting out at least some light throughout most of the visible spectrum. Assuming you shoot raw files, you can adjust the color response curve before converting the raw file and correct for the color cast so that things look the actual color they are.
Colored LED lights are different, though. Red LED lights put out very little light other than in a narrow band of red. Blue LED lights put out very little light other than a narrow band of blue. Green LED lights are slightly better, but they still mostly put out a narrow band of green light.
Answer:
It can definitely be a problem, especially if the LED lights in question are not white LED lights. White LED lights, at least the higher quality ones, put out enough red, green, and blue light to work fairly well for most cameras. The results might not be as ideal as a fuller spectrum light source, but you can usually get pretty close. Typical high quality white LEDs put out a stronger blue channel than red or green. Red is usually stronger than green at the wavelengths to which many cameras are most sensitive to red and green respectively. Depending on the exact colors of the filter on your camera's Bayer mask, you'll probably have to pull back blue and boost green to get the colors looking more natural.
The problem is that not all white LED lights put out enough red and/or particularly green light in the part of each of those bands to which digital cameras are most sensitive. When that is the case it becomes an issue if you want to remove color casts that were in the scene when you post process your images.
Shooting under traditional incandescent lights with a color cast is less of a problem because even when they have a strong color cast they are usually putting out at least some light throughout most of the visible spectrum. Assuming you shoot raw files, you can adjust the color response curve before converting the raw file and correct for the color cast so that things look the actual color they are.
Colored LED lights are different, though. Red LED lights put out very little light other than in a narrow band of red. Blue LED lights put out very little light other than a narrow band of blue. Green LED lights are slightly better, but they still mostly put out a narrow band of green light.
If you have all three colors of LED lights mentioned above then you can usually adjust the color response curve in post to make the light look natural. But if you only have one or two there are going to be colors that you won't be able to pull out of the raw data no matter what you do. Again, this is especially the case when green is most deficient. Remember that your camera, like your eyes, is most sensitive to green light. Half the pixel wells of a typical digital camera are filtered for green light. When there is very little light that includes green wavelengths in the scene your camera's sensor sensitivity is effectively halved!
Explanation:
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