The answer to this puzzle is a number.
For the color blind, here are the colors of all characters in the grid:
VIBGWORGORWWBY VIBGWOWGORIVWY VIBGWOWGORIVWY WWWGWWWWWGWWBW VWWWYORWWWIWWY WIWWYWWGORWWBW VWBGYWWWWRIWBW VWWWYOWWWRIVBW WWBWYWRGORIVWY VWBWYWWGOWIWWW
Here is the transcription of all characters in the grid:
YOFYSIYIIEFEPU IIRMLSSSAMIPPB KISWHLSIHEKHGE ROJYONZSAAABJA SWKWIIMTNCNCBH LAUNLSRCACCCGK KOAZOIEHCENHNL UAUMPLNTNCTPLA IEDEDNENEHNNGL LOFZOEZEHEFNEU
There is a hint encoded in the colors of the columns
In every column one character is encoded in binary