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%?

Reece

Also - shoot in RAW. JPEG / JPG is a lossy format and uses compression. So your JPG image is nowhere near as high quality as a RAW image. And when you transfer it to a computer, you make a direct copy with no import processing. An image with a resolution of 3840 x 2160 at 300 dpi in RAW is approximately 18 MB in size. The same resolution at 300 dpi in JPG is around 5-7 MB. The same resolution JPG, but in 96dpi or 72dpi it will only be 800-1200kB.

Michael Clark

"The same resolution at 300 dpi in JPG will be about 5 to 7MB. The same resolution at JPG, but at 96 dpi or 72 dpi, will only be 800 to 1200 kB." ?? !! ?? !! ?? !! ?? 3840 x 2160 pixels are 3840 x 2160 pixels. The dpi has absolutely no influence on the size of the image file. Compression ratio does.

Agent_L

@ReeceDodds DPI in JPEG is just one parameter. You can edit it to 1 dpi or 10000 dpi without changing a single pixel. It's just an indication of how to zoom in on the file when viewing or printing it.

Agent_L

@ReeceDodds Also the RAW advice is very bad as RAW is not a picture at all. It's just a dump of sensor data that takes a lot of work to turn into a useful picture. Unless someone White, how to do this work, she can better than the camera run and is ready to actually make an effort. The recommendation to take RAWs boils down to "making your photos awkwardly large and illegible". There is no need for RAWs until the need is manifest.