python raster image HEX code

Question

I work currently with a thermal printer using ESCPOS command set.

I got this image:

And they gave me the correct HEX code I have to sent to the printer to print the image above. The code from the picture above:

10 10 00 00 00 00 00 00 1F FF FF FE 00 00 00 00 00 00 00 00 00 00 00 01 FF FF FF FF C0 00 00 00 00 00 00 00 00 00 00 0F FF FF FF FF F8 00 00 00 00 00 00 00 00 00 00 3F FF FF FF FF FE 00 00 00 00 00 00 00 00 00 01 FF FF FF FF FF FF C0 00 00 00 00 00 00 00 00 07 FF FF FF FF FF FF F0 00 00 00 00 00 00 00 00 0F FF FF FF FF FF FF FC 00 00 00 00 0C 00 00 00 3F FF FF B0 00 7F FF FF 00 00 00 00 0C 00 00 00 7F FF F0 10 00 07 FF FF 80 00 00 00 00 00 00 01 FF FF 80 08 00 01 FF FF C0 00 00 00 00 00 00 03 FF FC F9 E8 00 00 3F FF E0 00 00 00 00 00 00 0F FF E0 00 18 00 00 0F FF F0 00 00 00 00 00 00 1F FF C0 00 00 00 00 03 FF FC 00 00 00 00 00 00 3F FF 00 00 00 00 00 00 FF FE 00 00 00 00 00 00 7F FC 00 00 00 00 08 00 7F FF 00 00 00 00 00 00 FF F8 00 00 00 00 00 00 1F FF 80 00 00 00 00 01 FF E0 00 00 00 00 00 00 0F FF C0 00 00 00 00 03 FF C0 00 00 00 00 00 00 03 FF E0 00 00 00 00 07 FF 00 00 00 00 00 0E 00 01 FF F0 00 00 00 00 0F FE 00 00 00 00 00 0C 00 00 FF F8 00 00 00 00 0F F8 00 00 00 00 00 1C 00 00 7F FC 00 00 00 00 1F F0 00 00 00 00 00 18 27 00 3F FC 00 00 00 00 3F E0 00 00 00 00 1F FF FF 40 1F FE 00 00 00 00 7F F0 00 00 00 01 FF FF FF F0 0F FF 00 00 00 00 FF A0 00 00 00 1F FF FF FF FF 07 FF 80 00 00 00 FF 20 00 00 00 7F FF FF FF FF C3 FF 80 00 00 01 FF 40 00 00 00 FF FF FF FF FF F1 FF C0 00 00 03 FF 40 00 00 07 FF FF FF FF FF F8 FF C0 00 00 03 FE 40 00 00 1F FF FF FF FF FF FC FF E0 00 00 07 FE 80 00 00 7F FF FF FF FF FF FE 7F F0 00 00 07 FC 80 00 01 FF FF FF FF FF FF FF 3F F8 00 00 0F F3 00 00 07 FF FF FF FF FF FF FF BF F8 00 00 0F F6 00 00 1F FF FF FF FF FF FF FF DF FC 00 00 1F EC 00 00 3F FF FF FF FF FF FF FF CF FC 00 00 1F E8 00 00 FF FF FF FF FF FF FF FF EF FE 00 00 3F C8 00 03 FF FF FF FF FF FF FF FF F7 FE 00 00 3F 88 00 07 FF FF FF FF FF FF FF FF F7 FE 00 00 3F 88 00 1F FF FF FF FF FF FF FF FF FB FF 00 00 7F 08 00 3F FF FF FF FF FF FF FF FF FB FF 00 00 7F 30 00 7F FF FF FF FF FF FF FF FF FD FF 00 00 FF 40 01 FF FF FF FF FF FF FF FF FF FD FF 80 00 FE 40 03 FF FF FF FF FF FF FF FF FF FE FF 80 00 FE 40 07 FF FF FF FF FF F3 FF FF FF FE FF 80 01 FC 40 0F FF FF FF FF FE 03 FF FF FF FE FF C0 01 FC 80 1F FF FF FF FF C0 03 FF FF FF FE 7F C0 03 FC 80 3F FF FF FF FE 00 03 FF DF FF FE 7F C0 0F FD 00 7F FF FF FF F8 00 03 FF C7 FF FE 7F E0 0B F8 00 FF FF FF FF E0 00 03 FF C7 FF FF 3F E0 13 FA 00 FF FF FF FF C0 00 03 FF C7 FF FE 3F E0 17 FE 01 FF FF FF FF FC 00 03 FF C7 FF FF 3F E0 17 F8 03 FF FF FF FF FF 00 03 FF C3 FF FE 3F E0 17 F0 03 FF FF FF FF FF C0 03 FF C3 FF FE 1F F0 17 F0 07 FF FF FF FF FF E0 03 FF C3 FF FE 1F F0 17 F0 07 FF FF FF FF FF E0 03 FF C3 FF FE 1F F0 17 F0 0F FF FF FF FF FF F0 03 FF C3 FF FE 1F F0 0F F0 0F FF FF FB FF FF F8 03 FF C3 FF FE 1F F0 0F F0 1F FF FF E7 FF FF F8 03 FF C3 FF FE 1F F0 0F F0 1F FF FF C7 FF FF FC 03 FF C3 FF FE 1F F8 0F F0 1F FF FF 8F FF FF FC 03 FF C3 FF FE 0F F8 0F F0 1F FF FF 1F FF FF FE 03 FF C3 FF FE 0F F8 0F F0 1F FF FE 3F FF FF FE 03 FF C3 FF FE 0F F8 0F F0 3F FF FE 1F FF FF FE 03 FF C3 FF FE 0F F8 0F F0 1F FF FC 3F FF BF FE 03 FF C1 FF FE 0F F8 0F F0 1F FF F8 3F FE 1F FE 03 FF C1 FF FE 0F F8 0F F0 1F FF F8 3F FC 1F FE 03 FF C1 FF FE 0F F8 0F F0 1F FF F0 3F FD DF FE 03 FF C1 FF FE 0F F8 07 F0 3F FF F0 3F F9 5F FE 07 FF C1 FF FE 0F F8 07 F0 1F FF F0 3F F9 5F FE 07 FF C1 FF FE 0F F8 07 F0 1F FF E0 7F F9 5F FF 0F FF C1 FF FE 0F F8 07 F0 1F FF E0 BF F9 5F FF FF FF 81 FF FE 0F F8 07 F0 1F FF E0 BF F9 5F FF FF FF 81 FF FE 0F F8 07 F0 1F FF E0 BF F9 DF FF FF FF 81 FF FE 1F F8 07 F0 3F FF E0 BF F8 DF FF FF FF 81 FF FE 1F F8 07 F0 3F FF E0 BF F8 1F FF FF FF 81 FF F8 1F F0 07 F0 3F FF E0 BF F8 0F FF FF FF 01 FF C0 1F F0 07 F0 3F FF E0 BF F9 CF FF FF FE 01 FE 00 3F F0 07 F0 3F FF E0 BF F9 6F FF FF FC 00 F0 00 3F F0 03 F0 3F FF E0 BF F9 37 FF FF FC 00 00 00 3F F0 03 F0 3F FF E0 BF F9 17 FF FF F8 00 00 00 3F F0 03 F8 3F FF E0 BF F9 13 FF FF F0 00 00 00 3F F0 03 F8 3F FF E0 BF F9 09 FF FF E0 00 00 00 3F E0 03 F8 3F FF E0 FF F9 0C 7F FF E0 01 00 00 7F E0 01 F8 3F FF E0 3F F9 06 3F FF 10 03 80 00 7F E0 01 FC 3F FF E0 3F F9 03 0F FC 60 01 C0 00 7F E0 01 FC 3F FF E0 3F F9 00 E0 01 80 01 C0 00 7F C0 01 FE 3F FF E0 3F F9 00 37 FE 00 08 80 00 FF C0 00 FE 3F FF E0 3F F9 00 18 00 00 00 00 01 FF C0 00 FE 3F FF E0 3F F9 00 00 00 00 00 00 01 FF 80 00 FE 3F FF E0 3F F9 00 00 00 00 00 00 01 FF 80 00 FF 3F FF E0 3F F9 00 00 00 00 00 00 03 FF 80 00 7F 3F FF E0 3F F9 00 00 00 00 00 00 03 FF 00 00 7F FF FF E0 3F F9 00 00 00 00 00 00 03 FF 00 00 3F FF FF E0 1F E1 00 00 00 00 00 00 07 FF 00 00 3F FF FF E0 1F C9 00 00 00 00 00 00 07 FE 00 00 3F FF FF E0 10 7E 00 00 00 00 00 00 0F FE 00 00 1F FF FF C0 08 7E 00 00 00 00 00 00 0F FC 00 00 1F FF FF 80 07 FE 00 00 00 00 00 00 1F FC 00 00 0F FF FE 01 81 F2 00 00 00 00 00 00 1F F8 00 00 0F FF E0 00 01 F0 00 00 00 00 00 00 3F F8 00 00 07 FF 80 00 00 00 00 00 00 00 00 00 3F F0 00 00 07 FE 80 00 00 00 00 00 00 00 00 00 7F F0 00 00 03 FF 00 00 00 00 00 00 00 00 00 00 FF E0 00 00 03 FE 00 00 00 00 00 00 00 00 00 01 FF E0 00 00 01 FF 00 00 00 00 00 00 00 00 00 03 FF C0 00 00 00 FF 80 00 00 00 00 00 00 00 00 03 FF 80 00 00 00 FF C0 00 00 00 00 00 00 00 00 07 FF 80 00 00 00 7F C0 00 00 00 00 00 00 00 00 0F FF 00 00 00 00 3F F0 00 00 00 00 00 00 00 00 1F FE 00 00 00 00 1F F8 00 00 00 00 00 00 00 00 3F FC 00 00 00 00 0F FC 00 00 00 00 00 00 00 00 7F FC 00 00 00 00 0F FE 00 00 00 00 00 00 00 00 FF F8 00 00 00 00 07 FF 00 00 00 00 00 00 00 01 FF F0 00 00 00 00 03 FF C0 00 00 00 00 00 00 03 FF E0 00 00 00 00 01 FF E0 00 00 00 00 00 00 07 FF C0 00 00 00 00 00 FF F0 00 00 00 00 00 00 1F FF 80 00 00 00 00 00 7F FC 00 00 00 00 00 00 3F FF 00 00 00 00 00 00 3F FE 00 00 00 00 00 00 FF FE 00 00 00 00 00 00 1F FF 80 00 00 00 00 03 FF FC 00 00 00 00 00 00 07 FF E0 C0 00 00 00 1F FF F8 00 00 00 00 00 00 03 FF F9 3E 00 00 00 7F FF E0 00 00 00 00 00 00 01 FF FF 83 FE 40 1F FF FF C0 00 00 00 00 00 00 00 7F FF FF E0 CF FF FF FF 00 00 00 00 00 00 00 00 3F FF FF FF FF FF FF FE 00 00 00 00 00 00 00 00 0F FF FF FF FF FF FF FC 00 00 00 00 00 00 00 00 07 FF FF FF FF FF FF E0 00 00 00 00 00 00 00 00 03 FF FF FF FF FF FF 80 00 00 00 00 00 00 00 00 02 1F FF FF FF FF FE 08 00 00 00 00 00 00 00 00 03 FF FF FF FF FF FF F0 00 00 00 00 

They told me to use 'raster images' to generate code. I don't find any solution returning me the correct code for the image above.

Any idea how to get a function returning the code above when entering the picture I showed above?

Answer 1

The raster data you've been given is 128 lines of 16 bytes each, with a lead 2 bytes setting the raster size (128 x 128). Each bit is either 0 or 1 defining don't print (white) or print (e.g. black), e.g. a simple black-and-white format.

It appears that the bytes are encoding pixels from top to bottom rather than from left-to-right as the bytes you produced otherwise would build a flipped and rotated image:

but if you take the data as most-significant bit is top left and following bits going down rather than right you get:

You'd have to generate the same data yourself from an image, once you converted it to black-and-white. Read the black-and-white image data from top to bottom, line by line, based on a PIL Image '1' mode image. If you transpose the image (flip and rotate) you can put the columns into rows and get the required bytes in one step using Image.tobytes() and use the 1;I mode for the raw encoder to produce the inverted data:

from PIL import Image, ImageOps
img = Image.open("original.png")
bwimg = img.convert('1')
transposed = bwimg.transpose(Image.ROTATE_270).transpose(Image.FLIP_LEFT_RIGHT)
data = bytearray(transposed.size)
data.extend(transposed.tobytes('raw', '1;I'))

Once you have a black-and-white image (mode 1) in the right orientation, all you have to do is take the size as the first 2 bytes, and the tobytes() method produces the raw image data (1 bit per pixel).

The '1;I' mode for the raw encoder produces 0 for white, 1 for black instead of the default 0 for black, 1 for white mode, see the raw modes table.

For your input image (which is slightly different from the raster data you have been given), that produces:

80 80 00 00 00 00 00 00 01 ff ff c0 00 00 00 00 00 00 00 00 00 00 00 00 0f ff ff fc 00 00 00 00 00 00 00 00 00 00 00 00 ff ff ff ff 80 00 00 00 00 00 00 00 00 00 00 07 ff ff ff ff f0 00 00 00 00 00 00 00 00 00 00 1f ff ff ff ff fc 00 00 00 00 00 00 00 00 00 00 ff ff fb 7f ff ff 80 00 00 00 00 00 00 00 00 01 ff fd 00 00 3f ff e0 00 00 00 00 04 00 00 00 07 ff a0 00 00 03 ff fc 00 00 00 00 0c 00 00 00 1f fc 00 00 00 00 7f fe 00 00 00 00 00 00 00 00 3f f0 00 00 00 00 1f ff 00 00 00 00 00 00 00 00 ff c0 00 00 00 00 07 ff 80 00 00 00 00 00 00 01 ff 00 00 00 00 00 01 ff c0 00 00 00 00 00 00 03 fc 00 00 00 00 00 00 ff e0 00 00 00 00 00 00 0f f8 00 00 00 00 00 00 1f f8 00 00 00 00 00 00 1f e0 00 00 00 00 00 00 1f f8 00 00 00 00 00 00 3f c0 00 00 00 00 00 00 07 fe 00 00 00 00 00 00 7f 00 00 00 00 00 00 00 01 ff 00 00 00 00 00 00 fe 00 00 00 00 00 00 00 01 ff 80 00 00 00 00 01 f8 00 00 00 00 00 00 00 00 7f 80 00 00 00 00 03 f0 00 00 00 00 00 00 00 00 3f e0 00 00 00 00 07 e0 00 00 00 00 00 00 00 00 1f e0 00 00 00 00 0f c0 00 00 00 00 00 00 00 00 0f f0 00 00 00 00 0f 00 00 00 00 00 00 00 00 00 07 fc 00 00 00 00 1f 00 00 00 00 00 09 bf fc 00 03 fc 00 00 00 00 3e 00 00 00 00 00 76 40 13 e0 01 fe 00 00 00 00 7c 00 00 00 00 0b 89 bf fd 1c 00 fe 00 00 00 00 7a 00 00 00 00 74 77 ff ff f3 80 ff 00 00 00 00 f8 00 00 00 00 8b df ff ff fe 60 7f 80 00 00 01 f0 00 00 00 03 6d ff ff ff ff b0 3f 80 00 00 01 f0 00 00 00 1c bf ff ff ff ff c8 3f e0 00 00 03 e0 00 00 00 23 7f ff ff ff ff f8 1f e0 00 00 03 c0 00 00 01 dd ff ff ff ff ff fc 0f f0 00 00 07 e0 00 00 02 2f ff ff ff ff ff ff 0f f0 00 00 07 80 00 00 0d 7f ff ff ff ff ff fd 07 f8 00 00 0f 80 00 00 25 ff ff ff ff ff ff ff 47 f8 00 00 0f 00 00 00 57 ff ff ff ff ff ff ff 83 f8 00 00 1f 00 00 01 9f ff ff ff ff ff ff ff c3 fc 00 00 1e 00 00 02 7f ff ff ff ff ff ff ff a1 fc 00 00 3c 00 00 0d ff ff ff ff eb 6f ff ff f0 fc 00 00 3e 00 00 12 ff ff ff fe bc b1 ff ff c0 fe 00 00 3c 00 00 67 ff ff ff db 67 de 3f ff f8 fe 00 00 78 00 00 1f ff ff ff 66 91 63 cf ff e8 7f 00 00 7c 00 01 af ff ff f9 b8 00 9d 73 ff f0 7e 00 00 78 00 02 7f ff ff ae 80 01 7b 9d ff fc 3f 80 00 f8 00 04 ff ff fe d9 00 01 3e 06 ff e8 3f 00 00 f0 00 0b ff ff f7 60 00 00 fb 82 ff f8 3f 80 00 f0 00 11 ff ff fa 80 00 01 3e 03 7f ec 3f 80 01 f0 00 2f ff ff cc 00 00 01 7b 01 7f f8 1f 80 01 e0 00 47 ff ff 70 00 00 01 7d 03 3f ec 1f c0 01 e0 00 3f ff fe 80 00 00 01 3a 01 ff f0 1f c0 03 e0 00 9f ff f9 43 e8 00 01 ff 81 3f fc 1f c0 01 e0 01 7f ff ee 0c 14 00 00 3a 01 bf e8 0f c0 03 e0 00 3f ff f0 13 ff 80 01 bd 01 5f f4 0f e0 03 c0 03 ff ff a8 4f fe 40 01 7b 01 bf f8 0f c0 03 e0 00 7f ff 60 bf ff 80 00 be 00 bf ec 0f e0 07 c0 07 ff fe 81 2f ff 60 01 3b 01 5f f4 0f e0 03 e0 01 ff fd 80 ff ff d0 01 fe 80 bf f8 0f e0 07 c0 0d ff fa 02 7f ff a0 00 3b 00 bf ec 07 e0 03 e0 03 ff f4 01 ff ff f8 01 bd 01 5f f4 0f e0 07 c0 0b ff fa 05 fe df c0 01 7b 00 bf f8 07 f0 03 e0 0d ff d4 0b f5 27 f8 00 be 00 bf f4 07 e0 07 c0 03 ff e8 09 fe bb d8 01 3b 00 bf ec 07 e0 03 e0 0b ff d0 07 d0 05 e8 01 fe 81 5f f8 07 f0 07 c0 0b ff 60 1b e8 0b d4 00 3b 00 bf f4 07 e0 03 e0 07 ff 80 03 b0 0b f8 01 be 00 bf f8 07 f0 07 c0 0b ff e0 1f e0 09 cc 01 7b 00 bf ec 07 e0 03 e0 0b fe 80 03 b0 0f f0 01 3d 80 bf f4 07 f0 07 c0 05 ff 40 1b d0 01 dc 02 fe 00 bf f8 07 e0 03 c0 0b ff 80 17 a0 1b e8 01 3b 00 bf ec 07 e0 07 e0 0b fe c0 13 f0 0b f4 06 fd 00 bf f4 07 f0 03 c0 07 ff 00 17 90 09 ee 99 fe 00 bf b8 07 e0 07 e0 0b ff c0 13 e0 0f fb e6 f5 00 b6 d4 0f e0 03 c0 0b fe 80 1f b0 01 fc 1b fa 00 bf 68 07 e0 03 e0 15 ff 40 03 50 0b ff ef ec 00 a9 00 0f c0 03 c0 0b ff 80 1f e0 05 ff bf f4 00 de 00 0f e0 03 e0 0b fe c0 03 b0 02 ff ff d8 00 20 00 0f e0 03 c0 17 ff 00 1f d0 03 7f ff f0 00 00 00 0f c0 01 e0 09 ff c0 03 60 00 ff ff 50 00 00 00 0f e0 03 e0 17 fe 80 1f d0 03 3f ff a0 00 00 00 0f c0 01 e0 0b ff 40 03 b0 00 df fa c0 00 00 00 1f c0 01 f0 15 ff 80 1f d0 00 2f ed 00 00 00 00 1f c0 01 f0 0b fe c0 03 60 00 12 b4 00 00 00 00 3f 80 00 f0 17 ff 40 1f d0 00 0a a8 00 00 00 00 1f c0 00 f0 09 ff 80 03 b0 00 00 00 00 00 00 00 3f 80 00 f8 17 ff 40 1f e0 00 00 00 00 00 00 00 3f 80 00 f8 0b fe 80 03 b0 00 00 00 00 00 00 00 7f 00 00 7c 15 ff c0 1f 50 00 00 00 00 00 00 00 3f 00 00 7c 0b ff 00 03 e0 00 00 00 00 00 00 00 ff 00 00 7c 17 ff c0 1f d0 00 00 00 00 00 00 00 fe 00 00 3c 09 fe 80 03 30 00 00 00 00 00 00 00 fe 00 00 3e 17 ff 40 1d e0 00 00 00 00 00 00 01 fe 00 00 3e 0b ff c0 03 00 00 00 00 00 00 00 01 fc 00 00 1e 15 fe 80 0c 80 00 00 00 00 00 00 01 fc 00 00 1f 0b ff 40 00 00 00 00 00 00 00 00 03 f8 00 00 0f 97 fa 80 00 00 00 00 00 00 00 00 03 f8 00 00 0f 89 a5 00 00 00 00 00 00 00 00 00 07 f0 00 00 07 96 fa 00 00 00 00 00 00 00 00 00 07 f0 00 00 07 eb 00 00 00 00 00 00 00 00 00 00 0f e0 00 00 03 e4 80 00 00 00 00 00 00 00 00 00 0f e0 00 00 03 f2 00 00 00 00 00 00 00 00 00 00 1f c0 00 00 01 f0 00 00 00 00 00 00 00 00 00 00 3f 80 00 00 01 f8 00 00 00 00 00 00 00 00 00 00 3f c0 00 00 00 f8 00 00 00 00 00 00 00 00 00 00 7f 00 00 00 00 7c 00 00 00 00 00 00 00 00 00 00 ff 00 00 00 00 7e 00 00 00 00 00 00 00 00 00 01 fe 00 00 00 00 3f 00 00 00 00 00 00 00 00 00 01 fc 00 00 00 00 1f 80 00 00 00 00 00 00 00 00 03 fa 00 00 00 00 0f 80 00 00 00 00 00 00 00 00 07 f8 00 00 00 00 07 e0 00 00 00 00 00 00 00 00 0f f0 00 00 00 00 07 e0 00 00 00 00 00 00 00 00 1f e0 00 00 00 00 03 f8 00 00 00 00 00 00 00 00 3f d0 00 00 00 00 01 fc 00 00 00 00 00 00 00 00 7f c0 00 00 00 00 00 fc 00 00 00 00 00 00 00 00 ff 00 00 00 00 00 00 7f 80 00 00 00 00 00 00 01 ff 00 00 00 00 00 00 1f 80 00 00 00 00 00 00 07 fc 00 00 00 00 00 00 1f e0 00 00 00 00 00 00 0f fc 00 00 00 00 00 00 07 f8 00 00 00 00 00 00 3f f0 00 00 00 00 00 00 07 fc 00 00 00 00 00 00 7f e0 00 00 00 00 00 00 01 ff 00 00 00 00 00 03 ff c0 00 00 00 00 00 00 00 7f c0 00 00 00 00 0f ff 80 00 00 00 00 00 00 00 3f f0 00 00 00 00 5f fe 00 00 00 00 00 00 00 00 1f fe 80 00 00 0b ff f8 00 00 00 00 00 00 00 00 07 ff fa 20 8a ff ff f0 00 00 00 00 00 00 00 00 01 ff ff ff ff ff ff c0 00 00 00 00 00 00 00 00 00 ff ff ff ff ff ff 00 00 00 00 00 00 00 00 00 00 07 ff ff ff ff f8 00 00 00 00 00 00 00 00 00 00 02 ff ff ff fe a0 00 00 00 00 00 00 00 00 00 00 00 12 92 aa 80 00 00 00 00 00 00

or the image:

You may need to tweak how you convert from your colour or grayscale image to black-and-white to achieve better effects. My Ninja avatar becomes:

with this process. Both these images have been rotated / flipped back to represent the image data as it would be printed.