by Bart Arondson

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There are many ways your camera might try to create a smaller image file, among them higher JPG compression. What exactly is going on inside of your camera is the manufacturer's secret. My assumption would be that the camera takes a raw image as usual and then just downscales it using a cheap (in terms of processing cost) rescaling algorithm. This is ...


Your conclusion is partially correct. You will get some noise reduction as part of the downscaling process. But it will come from the same image and camera settings (shutter, aperture, ISO) won't be different for the S and L modes. It's also likely that the S mode is using a lower quality setting on the JPEG encoder, which will negate some of the gains ...


I do not know your specific camera model, but I think in general that the S-to-L scale refers to the size of the compressed jpg image when stored on your camera memory card. In other words, your camera takes a raw picture at most of its possibilities and then compresses it in jpg format to save space on disk. Jpg is a lossy format, it means you can compress ...


My gut feeling tells me that the expert probably doesn't mean 24mb. Probably megapixels. From the number of pixels alone, you would probably never be able to output a 24mb JPEG with that resolution. JPEGs are compressed 8bit per channel images. So if there's no compression at all, your images would be a maximum of 18x3=54mb. You (typically) except a 5 to ...


I recall, 20+ years ago, people in the graphic industry referred to file size as a proxy for resolution. Given that files were never compressed, and the aspext ratio was normal and pixels were 3 bytes, it made sense. Although it bothered and amused me that they often had no concept of resolution and couldn't handle linear pixel measures and sometimes ...


An expert said I should use at least 24MB pictures for stock. You sure the "expert" meant 24 MB, not MP? I don't know much about the higher MP cameras, but I can't imagine anything but maybe the 36 MP Nikon D800 having a 24MB file size. If you take a look at Nikon's official website, you'll see file-sizes ranging from 17 to 29 MB. If it's true that you ...

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