Why RAW to JPG creates more noise in image in Adobe Photoshop?

Question

When i click image at that time Raw format doesn't contain any noise, but when i opened into Adobe Photosho CC 2017 version and after modifying raw data and open to ps ans save as jpg gives colors noise. why happening this ? is there any raw editor better than PS ?

Answer 1

JPG is compressing the file to make it smaller in size. It does this by throwing away data, thus colored pixels. It sounds like you are seeing what we call in industry, "artifacts". These look like blurred parts of the image where pixels used to be. Excessing compression or compressing solid areas of color with the JPG format (which is best of photographic images) will cause this also.