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inav-nrf24l01/docs/development/Bitmap Creation.md

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  1. # Bitmaps
  3. The bitmapDecompress function in INAV is currently designed to work with RLE compressed monochrome bitmaps.
  5. ## Image format
  7. ![Armed RLE Bitmap](assets/armed128x32.bmp)
  9. Images supported by this function are required to be 128 pixels wide, with the exception being an image only 8 pixels in height. The image height should be divisible by 8, but not be larger than the display height of 64. The bitmap image should be monochrome, 1-bit.
  11. Example Photoshop new image settings:
  13. ![Photoshop](assets/photoshop.jpg)
  15. ## Compression and HEX conversion
  17. Your new bitmap file will need to be converted to run-length encoding compressed hexidecimal. The [Gabotronics Image to HEX Converter v1.03](http://www.gabotronics.com/download/resources/bmp-converter.zip) works very nicely for this.
  18. The proper settings are shown in the screenshot below:
  20. ![Photoshop](assets/gabotronics.jpg)