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OLED log image change method in DK-TM4C123G (3th_ Question)

Dear all

How to change the image in GIMP application

  Chapter 13.4 pmntoc of Graphics Library USER'S GUIDE.

1. Load the file (File-> Open).
2. Convert the image to indexed mode (Image-> Mode-> Indexed).
3. Save the file as a PNM image (File-> Save As).
4. Use pnmtoc to convert the PNM image into a C array.

  The question used in GIMP.

1. BMP image files *. How do I pnm format does not exist?

      The present format * .xcf.

2. In what ways do you change the PNM image to a C array?
     pnmtoc -c *.ppm> *.c, how do I apply a command from any application?

  thanks.