How many pixels in 400 kB picture?

The number of pixels in a 400 kB picture depends on the image's color depth and compression. For example, a standard RGB image has 3 bytes per pixel. Therefore, a 400 kB image could contain approximately 133,333 pixels if uncompressed (400,000 bytes / 3 bytes per pixel). However, if the image is compressed (such as in JPEG format), the pixel count could vary significantly based on the compression level, making it difficult to determine an exact number without more information.