This is a bitmap file generated thus:

The following code, which is identifiable to the human eye as being primitive ASCII art representing the letter "J" in a pattern of ones, is pasted into a text editor and saved as Example_of_ASCII-art_turned_into_a_bitmap.pbm.

P1
# J
6 10
0 0 0 0 1 0
0 0 0 0 1 0
0 0 0 0 1 0
0 0 0 0 1 0
0 0 0 0 1 0
0 0 0 0 1 0
1 0 0 0 1 0
0 1 1 1 0 0
0 0 0 0 0 0
0 0 0 0 0 0

This produces a 143-byte Portable bitmap image file displaying a black "J" on a white background.

This file is then converted to PNG in a compatible image-editing program (e.g. IrfanView) in order to able to display it online.

Here is this image magnified 20 times.

The PBM code for the example was taken from the Portable pixmap [1] article on Wikipedia. The simple design of the "J" is either too simple to be eligible for copyright, or it was released under the GFDL when it was inserted into the article text. The creator of this PNG image releases all rights over it.

我，此作品的版權所有人，釋出此作品至公共領域。此授權條款在全世界均適用。 這可能在某些國家不合法，如果是的話： 我授予任何人有權利使用此作品於任何用途，除受法律約束外，不受任何限制。