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For practical purposes the clarity of the image is decided by its spatial resolution, not the number of pixels in an image. In effect, spatial resolution is the number of independent pixel values per unit length. The spatial resolution of consumer displays ranges from 50 to 800 pixel lines per inch.
An image size can be changed in several ways. Consider resizing a 160x160 pixel photo to the following 40x40 pixel thumbnail and then scaling the thumbnail to a 160x160 pixel image. Also consider doubling the size of the following image containing text.
File:Harry potter and the deathly hallows part 1 game final cover.jpg; File:Harry Potter and the Half-Blood Prince (video game).jpg; File:Harry Potter and the Order of the Phoenix Coverart.jpg; File:Harry Potter and the Philosopher's Stone PC screenshot.jpg; File:Harry Potter Hogwarts Mystery screenshot.jpg; File:Harry Potter Magic Awakened.png
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Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifacts.
Original file (7,854 × 11,498 pixels, file size: 57.28 MB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.