Why does rendering on a PC take 10 seconds compared to 0.25 seconds in-camera?

Started 5 months ago | Discussion thread
apaflo
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Re: Why does rendering on a PC take 10 seconds compared to 0.25 seconds in-camera?
In reply to A Owens, 5 months ago

A Owens wrote:

There is no sensor that can produce a jpeg directly. The embedded jpeg, which is shot with the picture control settings, comes from what? Think a little about it.

[...]

You are talking about creation of the raw file, we are talking about rendering it once it is created. This is ALWAYS done from a jpeg in-camera while LR renders the preview from a raw file.

He is talking about rendering the RAW data to get the embedded JPEG.  It doesn't get there by magic, the camera's hardware/firmware renders it.

LR on the other hand first previews the embedded JPEG that the camera rendered, and then renders the RAW data to produce its own version of a JPEG.  LR's  preview is fast only because it need not render the RAW data to get a preview.  The camera does not have that advantage, as there is no JPEG available at all until  the camera renders the RAW data to produce the embedded JPEG.

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