How large can PNG file be in kilobytes

How much can be the most complex PNG image in kilobytes, s开发者_如何转开发ay, 100x100 pixels? How can I calculate it?

The maximum numbers of bits per pixel in a PNG is 64, so 640,000 bits, or 80,000 bytes.

There'll also be an 8 byte signature in the beginning of the file, some other information about the file, and EXIF data can contain arbitrary amounts of information. Wikipedia has information on the spec.

If you're looking for a reasonable approximation for an upload limit, 100-150kb is probably fair. If you're looking for an exact number, there isn't one.