If a PDF file contains many color images and file size is essential but color isn’t, the conversion saves space. Pixel's average is effectively a "brightness" number 0.Sometimes it can be useful to convert a color PDF to grayscale.Once its working with flowers.jpg, try it with poppy.jpg or oranges.jpg. The result is a grayscale version of the original color image. Then set the red, green, and blue values of the pixel to be that average number. This average number represents the brightness of the pixel 0.255. GRAYSCALE TO COLOR CONVERTER CODE
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