Mozilla Banner (GIF 89a):

8-bit:



7-bit:


6-bit:



5-bit:



4-bit:



3-bit:


Gray:




Transparent space image (GIF 89a):

8-bit:


7-bit:



6-bit:



5-bit:



4-bit:



3-bit:



Gray:



Five Rows of a black pixel (GIF 89a):