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1. Image gets blurred when added to Excel through JXL    stackoverflow.com

I use the JXL API to add an Image to an Excel file. Libraries used:
jcommon (1.0.14)
jfreechart (1.0.13)
jxl (2.6.10) 

// chartImage is of type BufferedImage
com.KeyPoint.PngEncoder encoder = new com.KeyPoint.PngEncoder(chartImage, true, 0, 0); 
jxl.write.WritableImage ...