How are 3200 x 1800 pictures taken
Took my first 4k picture; Why is it so disappointing?
Most cameras already have a resolution that goes well beyond 4K. Assuming you mean Ultra HD (3840 x 2160) as opposed to "real" DCI 4K (4096 x 2160), you get a resolution of around 8 MP (DCI 4K would be around 8.8 MP). Most cameras are already well over this size and have a resolution of 20 MP or more. So a "4K" picture would actually be smaller than a full-size picture.
That being said, you still need an image that is properly focused, taken with a shutter speed that isn't blurry, with an ISO that isn't grainy, etc. Resolution is only a small part of a sharp image.
And even if you have perfect sharpness and no ISO noise, you can't zoom (much) past 100% before it becomes blocky. This is because the moment you start displaying 1 pixel as more than one pixel, the software has to interpolate the meaning of the pixels. This is not so bad at 2X, 3X etc. magnification, since the pixels can only be displayed as larger pixels. If you are looking at a 1.5x magnification, the original pixel needs to be displayed and the other pixels that contribute to that pixel need to be used to calculate what the "half" pixel should look like.
So if you're looking at the image 100%, it shouldn't be blocky at all. Are you sure you are not enlarged over 100%?
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