Does the DIGIC processor affect RAW files on the EOS 600D vs 650D?
Asked 5/17/2013
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The EOS 600D uses DIGIC 4 and the EOS 650D uses DIGIC 5. If two cameras use different DIGIC processors, does that change the actual RAW image data that gets saved? In other words, is the sensor data processed by the DIGIC chip before being written to the RAW file, or are RAW differences mainly due to the sensor itself?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
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The RAW files are different because the sensors are different. The processor does not do anything to the RAW data, it simply reads it and packages it in a RAW format. The embedded JPEG preview though is computed differently by these processors, just like a JPEG would.
In theory, yes, the phase-detect pixels affect image-quality but the effect is extremely small and it depends how they are masked. Each phase-detection pixel is very similar to having a hot or dead pixel. After all, it is either masked completely from the output data or gives a different signal due to the microlens needed for on-sensor phase-detection.
Originally by user1620. Source · Licensed CC BY-SA 4.0
user1620
13y ago
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Generated from our catalog & community — verify before relying on it.
The DIGIC generation is not the main reason RAW files differ between the EOS 600D and 650D. RAW differences come primarily from the sensor, and those two cameras use different sensors.
In general, the processor reads the sensor data and packages it into the camera’s RAW format rather than applying the kind of image processing used for JPEGs. So the actual RAW capture is largely determined by the sensor, not by whether the camera has DIGIC 4 or DIGIC 5.
One place the processor can matter is the embedded JPEG preview inside the RAW file. That preview may look different because it is rendered by the camera, similar to a JPEG.
Also, on-sensor phase-detect pixels can have a very small image-quality effect in theory, depending on how they are masked or handled, but this effect is usually extremely minor.
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