Do smaller RAW formats give lower noise?

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In all fairness I'll provide some shots taken at ISO400 (upper row) and ISO640 for comparison. Processed with ACR, RAW downsized to sRAW size. No noise reduction was applied.

Image #1 is a 100% view of an image area.

In the 2nd and 3rd image I used a 400% magnification. It's interesting to see, that the RAW images still have a higher noise level at those low ISO values compared to sRAW. The gain in resolution in the RAW files is visible on a pixel-peeping level. The RAW images resolve shadow detail better in these images for example (see image #2, lower row). Well - there must be some good things in RAW too, right? ;)

Image #4 shows the full images.

Now it's up to you to draw a conclusion.

Kind regards,
Th.
 

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