Why do digital cameras have a problem with red light?
Apparently, the light-sensitive filters in cameras find red light the most difficult to process. Do you know why?
Answers:
Of all the light that we can see, red light has the lowest of energy. For the CCD (the sensor of the camera) to "see" red light there needs to be plenty of it. Blue light, for example, is a very high energy light.
Also, the CCD's in our digital camera's have Infrared filters. On the scale of energy levels, infrared is a little lower then red. They are very close neighbors. The filter, if poorly made, can actually filter out some of the lower energy levels of red light that the human CAN see.
Finally. properties of the processor. Some camera's can actually do something called White Balancing. Some pictures come out to bright. Most pictures come out to yellowish-red. Usually due to indoor lighting. Our eyes (& brain) adjust themselves to the indoor lighting so that things look "normal." However camera's cannot be tricked. they see what they see. Those indoor pictures are just. too yellowish-red sometimes. Camera's can take out some of the yellowish-red before the picture is saved to the memory card so that pictures look more "natural." Apart from that the processor also can look for prominent red areas of the picture, synchronous to the flash, and takes it out. We call it Red-Eye reduction.
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Answers:
Of all the light that we can see, red light has the lowest of energy. For the CCD (the sensor of the camera) to "see" red light there needs to be plenty of it. Blue light, for example, is a very high energy light.
Also, the CCD's in our digital camera's have Infrared filters. On the scale of energy levels, infrared is a little lower then red. They are very close neighbors. The filter, if poorly made, can actually filter out some of the lower energy levels of red light that the human CAN see.
Finally. properties of the processor. Some camera's can actually do something called White Balancing. Some pictures come out to bright. Most pictures come out to yellowish-red. Usually due to indoor lighting. Our eyes (& brain) adjust themselves to the indoor lighting so that things look "normal." However camera's cannot be tricked. they see what they see. Those indoor pictures are just. too yellowish-red sometimes. Camera's can take out some of the yellowish-red before the picture is saved to the memory card so that pictures look more "natural." Apart from that the processor also can look for prominent red areas of the picture, synchronous to the flash, and takes it out. We call it Red-Eye reduction.
Sorry if that's more then you needed. I couldn't stop myself.