this is demonstrated in the images and snippet below: finally, we compare that image with each character pixel by pixel and calculate average error. If that value is lower than a threshold value, we make it white, otherwise we make it black. Red = green = blue = (red + green + blue) / 3 it is possible to experiment with threshold value to impact contrast and enhance the final result as needed.Ī very simple method to accomplish this is to set red, green and blue values to the average of all three: we then simply pick the most similar character and do so until the whole image is converted. by doing so we get a black and white only contrasted image that we can compare with each character and calculate the difference. we do so by first doing some preprocessing of the original image: we convert the image to grayscale and apply a threshold filter. then we go through the original image and for each block of size of the characters we search for the best fit. first, we create an image of each character we want to use in our ascii art and cache it. down below you can see the code in action and an explanation of how it works. since it was built over a few hours during the weekend, it is not optimal but it was a fun experiment. i present you a very simple ascii art generator written in java with configurable font and contrast. it had it’s purpose in history when printers lacked graphics ability and it was also used in emails when embedding images was yet not possible. Ascii art is a technique that uses printable characters from ascii standard to produce visual art.
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