Red and Blue

by Gordon

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JPEG is a compressed format so the filesize does not correspond directly to the image resolution, but rather to it's content. The JPEG algorithm achieves lower filesizes with images that contain less detail, so if you have areas with very little detail, such as out of focus backgrounds or blown out skies then that can lead to dramatically smaller filesizes, ...


Based on the information you've given so far, I'm not yet convinced there is a problem. Assuming you mean 2-7 MB (Megabytes), not KB (Kilobytes), that file size could be consistent with a full resolution JPEG. 2-7 KB would not actually fit an image, except maybe a tiny thumbnail or icon. Look up the dimension of the image in pixels in your file browser - ...


All that information and more is already saved in the EXIF data attached to each image. Any good photo editor will show it to you.


It's actually not the camera you're trying to force to cough up EXIF information--it's the lens. The lens has no electronic contacts, and so cannot communicate any of the lens's EXIF information to the camera to record in the image's EXIF. If you were a Canon shooter, I'd tell you to go find an AF confirmation chip on eBay and glue it to the lens, but a ...


You can't. The Samyang lens is all-manual with no electronics to identify itself to the camera. In theory, the camera could have some feature which would let you enter this manually, but since Sony doesn't sell any lenses like that, they don't have a strong incentive to add that ability. See, however Correct EXIF metadata for Rokinon 8mm fisheye lens for ...


You can also use File -> Overwrite YourImage.jpg in Gimp 2.8.x if you are sure in what you are doing and don't need to keep the original image.


Use the "Export..." option on the File menu. .xcf is GIMP's native format, similar to how Photoshop uses .psd files, and stores all the information (layers and the like) GIMP needs to edit files in the future. It's possibly worth noting this is a change from GIMP 2.6 and earlier, where the "Save..." menu option could be used to save to formats other than ...


JPEG are almost always faster. The bottleneck is the bus to the memory card, if not the memory card. A faster memory card only shifts the bottleneck from the card to the bus but that will be your limit in terms of speed. This is because JPEG files are smaller by at least 50% and sometimes much more if you enable on of the lower-quality settings which ...


First - do you have a specific problem? The time to dump an image to the memory card varies a lot from camera to camera and the best solution for your problem is probably to try to investigate it yourself. Also why are you focusing on the time it takes dump the file to the memory card? With the often large buffers of modern cameras you can often continue to ...


It depends. There is not only one factor. RAW also have compression (in generally), but lossless, like zip. And depend of entropy (how much different information you have in picture) can produce different files. For example my camera produce from 25MB to 38MB RAW files. High ISO produce more noise and as result bigger files JPG files are compressed with ...

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