Recently i started shooting in RAW after understanding its advantages over JPEG format.
While processing the RAW file there is an option to reduce noise in a captured picture. It works great when i am working on RAW file. But as soon as I save file in JPEG format, noise comes back.
I understand that while converting from RAW to JPEG compression techniques will be applied. But how can i handle this situation (while doing post processing)?
Answer
JPEG doesn't retain 100% of the data. What you're calling "noise" in the jpeg might be what's usually called compression artifacts, or jpeg artifacts. If they're showing up when you save as a jpeg made with the maximum quality setting, the only fix is to save in a lossless format (tiff and png are popular).
I save everything in a lossless format, usually PSD. I save a jpeg version for the web, if needed, often at medium or high compression, and live with any artifacts. The only other reason I would save as jpeg is to send to a printing service that requires jpeg - if they take lossless formats I send them one of those (tiff usually).
As a side note different images can take different levels of compression without being too much impacted by the compression. Smooth gradients seem to be very susceptible to showing compression.
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