ZPL Command With Image

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Hello Team,

I facing some challenges in improving the printing quality, I have an application which takes the image and gives for the print.. to do that i ma following steps,
1. Capture Bitmap Image
2. Convert Bitmap into Grayscale bitmap
3. Convert Grayscale bitmap into ASCII HEX String
4. Embed HEX String in the ZPL command.. < XA ^MTD ^PW400 ^MUd,150,300^FO0,0^GFA {ASCII DATA} ^FS ^XZ>

But the quality of the image is not great, can you suggest with some pointers? Attaching image for the reference.
Thanks in advance.

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Steven Si
Zebra label printers are

Zebra label printers are thermal printers, which print monochrome (black & white) labels. Unlike black & white photo that has the scale (the grayscale), the thermal printers do not have grayscales. There is a darkness setting configurable on the printer. But the darkness setting is applied to the entire label on a per label basis, not on each dot. With this limitation, generally it's very unsatisfactory to print the image captured by a camera, because the grayscale gets lost on the final print. Unfortunately this is the limitation that all thermal label printers have to face.

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