Lightnings taking a ride

by ceinmart

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I use the /v flag when copying the files from the card, which compares the copy against the original after copying. I copy to a NAS that has its own protection against silent changes: ZFS applies a checksum to every data parcel. Without such under-the-hood automation, you can generate a file of hash codes (e.g. SHA-2) and periodically check them again. ...


There are several tools for detecting corrupted images, but It depends on the file type you want to check since each image type has its own compression method and therefore has its own integrity checks. I did a quick search on superuser and came up with this. Hope that answers your question. See also: Is there a tool to check the file integrity of a ...


Many of the things you want to eliminate are actually important for answering this question in the real world. In practice, image quality almost never comes down to sensor characteristics. I'm a little reminded of this Monty Python sketch..... when you eliminate all of the image quality factors other than the sensor, sure, the sensor is the only spec left. ...


"Too low" is a very subjective term, but for using the lens on both a crop camera and on a full frame camera, the lens is sharpest in the range of f/4.0 to f/8.0 or so.


Think about it: The stars are the same brightness the entire 40-60 seconds of each exposure and stay over the same pixels on your sensor. The meteors last a few seconds and move over very many pixels during that time. Even if the meteor is several times brighter than the brightest stars, each pixel that is collecting light from a star is getting more light ...


As everyone has noted, the file tyoe is not sufficient information. Find out resolution color space And the more varied details that could be a TIFF, e.g. if it's made for printing press then it could be CMYK set up for whst publishers want; color model (rgb? Cmyk?) bits per sample Also, if the jpeg is "just" the same file exported, it can still ...


Short answer: you have to use a microscope, a drum scanner or some specific scanners for film. Flatbed scanners barely reach 1500 dpi (real, effective, measured on the details you get, not on the number of pixels you get), see and the other ones. This is a measurement of actual details in some 120 ...


Or you can use a macro lens to scan your film. I've found this to give better results than anything short of a very high-end scanner. Use a digital camera, a macro lens and a lightbox of some sort mounted in a copy stand. For even better results, make multiple images of parts of the negative and stitch them.


It depends on the film: your estimate would be valid for old Panatomic-X using Beutler processing (I calculated ~116 Megapixels (MP) for a 6 cm x 6cm image, 180 lines/mm). Adox, though, claims about 500 MP for its CMS II High Resolution Film. So, yes, if you want to take advantage of the full resolution, scanning at ~9,600 DPI (~400 DPMM) would produce ...


I will start by a parallel with printing photos. Having a resolution of 300 ppi (pixels per inch) is relatively standard. It means that 300 pixels of a digital picture will be printed on one inch. It is common to assume that details are conserved with this resolution. So if the original painting is about 30*21 inch (like the Mona Lisa), you will need the ...


JPEG is a "lossy" compressed format, and it depends if the image is very homogeneous or not, very homogeneous images have a large compression factor meanwhile non-homogeneous images have a small compression factor. On the other hand TIFF is almost always used as a lossless format.


From the info you are providing there is no way to know. Some hints There is no way of knowing the resolution from the file size. Presumably both files have the same resolution (width x height), they are just delivered in different file formats. A high quality JPEG file has a very low information loss, (less than 0.4% compared to the uncompressed 24 bit ...

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