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.

Source and licence

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.

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.