Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
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3

There exist methods to do this, but as Alex. S also points out in his answer, there are no standard tools that I'm aware of that will do it for you. In principle, it's a straightforward problem. While there are a vast number of mathematically possible raw files that are consistent with the given JPEG file, the vast majority of those are not likely to be the ...


4

You cannot (should not) produce a raw from a jpeg. Theoretically it would be possible as compressed NEF is based on a TIFF container and a "wide" JPEG/JFIF variant IIRC. And all is not lost as, having run these kinds of competitions, I can say that you may still be able to enter depending on what type of competition it is and why they want raw files... ...


24

In addition to the points Alex S made, you need to consider why they want RAW. There are several possible reasons: Bit depth as Alex S said. JPG suffers from compression artefacts which RAW doesn't. Blown up to exhibtion size these can jump out and ruin a print. Having the RAW file is often used as a proxy for having taken the photo, as RAWs aren't ...


26

RAW is not (or minimally) processed image data from camera sensor. JPEG is processed image data. Typically, raw-files from modern cameras have 12-14-bit per pixel which means up to 16384 values (for more details see Michael Clark's comment). JPEG can have only 256 luminance values per RGB channel. This means that jpeg contains much less data than a ...


0

I was missing a sanity check for "same content" in the previous answers, because I had duplicate names for different pictures, because I had forgotten to enable the image counter in my camera. So, here's my version, which checks the EXIF information for same capture time (working on Mac OS X): you would need to sudo port install rmtrash exiv2 before you ...



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