[Image-SIG] Converting to zebra (ZPL) format

[Joao S. O. Bueno Calligaris]

Hi Peter,

despite Fredik's lengthy and carefull answer, I think that is not what 
you were asking for - his program is suitable to print images inpout 
inline inside a Python program as sequences of 0 and 1's. 

But I think you were asking for a way to print a generic image read 
from a disk file.

I can code that for you, if you wish so - just write me if no one else 
mailed yu a complete answer, and tell me more details about the 
images you want to print, maximum width of the printer, and stuff 
like that.

I also did nt understand if the Hexadecimal data you send to the  
printer is actual ASCII - i.e. You send a real  "F" character to get 
four dots "1111", or if you send a 15 decimal value standing for 0x0F

ANd please, do confirm that you have PIL installed (call a interactive 
Python shell and type 'import Image' there if you are not sure).

Regards,
	JS
	-><-



On Friday 17 June 2005 01:22, Peter Dempsey wrote:
> Hi folks, I'm a newbie to python so please be gentle.
>
> I want to convert an image to a format suitable for use in a Zebra
> label printer. The data sent to the printer consists of a string of
> hex characters. Each byte converts to a binary set of dots on the
> label.
>
> FF becomes 11111111
> A5 becomes 10100101
>
> So a string like this becomes a right-angle triangle...
>
> 18,3^m
> F00000FF0000FFF000FFFF00FFFFF0FFFFFF
>
> The 18 says how many bytes in the image, 3 says how many bytes wide
> the image is. So the string above becomes...
>
> F00000	->	111100000000000000000000
> FF0000	->	111111110000000000000000
> FFF000	->	111111111111000000000000
> FFFF00	->	111111111111111100000000
> FFFFF0	->	111111111111111111110000
> FFFFFF	->	111111111111111111111111
>
> I'm sure it's a simple task, I mean, the image is converted to a
> hex representation of the raw image.
>
> I've had some success doing it the hard way with python, importing
> a pcx image and going through it byte by byte but I'm sure there's
> an easier way.
>
> Any suggestions would be super.
>
> I don't have my code here at home. I can post it tomorrow if it
> helps.
>
> Thanks,
>
> Peter
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