raster example command

[mcluseau]

Hi,

Warning: this pulls your wip-rewrite branch.

raster command example. About features, here's the usage ;-) :

Usage of image2pos:
  -a string
    	Alignment (left, center, right) (default "center")
  -c	Cut after print
  -i string
    	Input image (default "image.png")
  -p string
    	Printer dev file (default "/dev/usb/lp0")
  -printer-max-width int
    	Printer max width in pixels (default 512)
  -t float
    	Black/white threshold (default 0.5)

[kenshaw]

This looks good. Have you actually tried to print that image? If so, would it be possible to add a quick photo of the output? I'll update the documentation, etc. and point to those. Really appreciate your efforts here!

[mcluseau]

Here you are ;-)

[MeritEhab]

Why this branch is not merged ?!

[mcluseau]

We have conflicts to resolve here, but the example on the current code base is merged:

https://github.com/kenshaw/escpos/blob/master/example/image2pos/main.go

[MeritEhab]

@mcluseau did you consider printers which support only bitmap ?!

[MeritEhab]

@mcluseau hello again, your raster code is very code it works pretty fine on my Epson TM88
but when I switched to SPRT SP-POS88VMF the image is printed as weird charters I searched for that and I found out that the SPRT printer don't support graphics, it supports bitImage or bitmap and bitcloumn rastrazation

Back to you code I found in the comments beside the code in the raster.go file line 21 to be specif

0x1d, 0x38, 0x4c, // GS 8 L, Store the graphics data in the print buffer -- (raster format), p. 252

so I was wondering dose the GS 8 L command concerned with the graphics only, and could i find
another command to support the bitmap storing data or I am digging at the wrong place and this is not the code snippet that should be changed

Sorry for the long comment and I would really appreciate your help
Thanks in Advance

[mcluseau]

Hi Merit, I only tried to implement support my specific use case, as you seem to try to do. I think other printer models will need other formats and you need to find the specification and add you conversion code from golang images to bitmap in a sub-package. So, just like there is raster, you'd have bitmap. And if your printer has a completely different protocol, of course this project is not the right target ou will need a major refactoring if we intend to handle lots of printers ;)

[MeritEhab]

@mcluseau hi thanks for your reply
And it's okay I have refactored the project and wrote a method for supporting bitmap images already

Thanks