8-bit (256 color) picture, there are 1048576, or 1024 X 1024 pixels in one megabyte. 16-bit (65536 colors) picture, one megabyte contains 524288 (1024 X 512) pixels. 24-bit RGB (16.7 million colors) picture, one megabyte has approximately 349920 (486 X 720) pixels.
Is 1mb high resolution?
Any image file less than 1MB will probably not be much use for high quality printing (unless it's going to be very tiny). Don't try to scale or touch up a low res photo. Send it to your designer for evaluation and they'll be able to tell you if it's useable.
Is 1mb a large file?
The easiest way to think of megabytes is in terms of music or Word documents: A single 3-minute MP3 is usually about 3 megabytes; A 2-page Word document (just text) is about 20 KB, so 1 MB would hold about 50 of them. Gigabytes, likely the size you're most familiar with, are pretty big.7 Apr 2019