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--- ascii_art [2023/03/25 14:21] – [Step 5. What if it looks your image looks squashed?] frchris
+++ ascii_art [2023/03/25 15:26] – [Step 3. Convert the RGB tuples of your pixels into single brightness numbers] frchris
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                    """"
 </code>
+This Lab is based on one of  [[https://robertheaton.com/2018/06/12/programming-projects-for-advanced-beginners-ascii-art/|Robert Heaton's Advanced Beginners Projects]].  I have made starter code for Java Students about to take the AP Computer Science A Exam.  You need to know somehting about 2D Arrays and String Objects.
 ==== Step 0. Choose an image ====
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 ==== Step 3. Convert the RGB tuples of your pixels into single brightness numbers  ====
+Now that you have a 2D Array of ''Color'', you can use the ''Color'' methods of ''getRed()'', ''getGreen()'', and ''getBlue()'' to assign a single brightness number.   There are many different ways to map RGB values to brightness, and each produces a slightly different style of transformed image. Think of them like Instagram filters. Some examples:
+  - Average: average the R, G and B values - ''(R + G + B) / 3''
+  - Lightness: average the maximum and minimum values out of R, G and B - ''max(R, G, B) + min(R, G, B) / 2''
+  - Luminance: take a weighted average of the R, G and B values to account for human perception - ''0.2126 R + 0.7152 G + 0.0722 B''
+  - Luminosity: Take the sqrt root of the weighted squares - ''sqrt( 0.299 R^2 + 0.587 G^2 + 0.114 B^2)''
+  - See [[https://stackoverflow.com/questions/596216/formula-to-determine-brightness-of-rgb-color|this stackoverflow thread]] for more detail
 ==== Step 4. Convert brightness numbers to ASCII characters  ====
 ==== Step 5. What if it looks your image looks squashed? ====