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pklaus / brother_ql_web

A Python-based web service to print labels on Brother QL label printers. Based on brother_ql: https://github.com/pklaus/brother_ql
GNU General Public License v3.0
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How to print in grayscale #42

Closed kingkongkai closed 2 years ago

kingkongkai commented 2 years ago

Is there a way to print labels with the gray scale values intact, or does brother_ql only support black and white thresholding? My label printer will print fine in grayscale when other software is used, but then there is the usual issue of paper size.

FriedrichFroebel commented 2 years ago

Are you sure that this issue should be reported against this repository with the web interface instead of the brother_ql base repository? According to the docs at https://github.com/pklaus/brother_ql/blob/56cf4394ad750346c6b664821ccd7489ec140dae/brother_ql/raster.py#L219-L221, I would assume that the answer is no for now. This seems to be given by https://github.com/pklaus/brother_ql/blob/56cf4394ad750346c6b664821ccd7489ec140dae/brother_ql/conversion.py#L154-L157 as well, which handles the actual conversion for the simple case with only black-on-white tape.

Skimming through the command reference at http://download.brother.com/welcome/docp000678/cv_qlseries_eng_raster_600.pdf and the code of brother_ql, I am not sure whether grayscale printing could be supported.

kingkongkai commented 2 years ago

Oops, no, I'm sorry, I meant to post this in the base repository indeed. Too many tabs open.

I should have mentioned, I am using a QL-800. This model is not covered in that command reference, but it does print grayscale when using other software.

FriedrichFroebel commented 2 years ago

Having a quick skim through https://download.brother.com/welcome/docp100278/cv_ql800_eng_raster_101.pdf, I could not find any helpful reference on this as well.

kingkongkai commented 2 years ago

I apologize, I didn't know what dithering was before now. That's actually the functionality I was looking for, which happened automatically when printing a gray scale image with other software.

There seems to be another issue though, regarding input/output error, which I only started getting on the QL-800. But I'll file a separate issue for that later.