How to render text with better resolution?

[devfservant]

Hello,

We have difficulties in rendering text with a good resolution.
We use RobotoCondensed-Regular.ttf font, downloaded from https://fonts.google.com/specimen/Roboto+Condensed.

• Here is what we achieved with BinaryKits.Zpl:
  
• Here is what we have on Google Fonts website:
  

When we print the generated document on a zebra printer, it results in a poor readable label.

How could we improve the quality/resolution of the generated document?

We tested several things like:

• increasing the DrawerOptions.RenderQuality value
• changing the ZplElementDrawer.draw(elements, labelWidth, labelHeight, printDensityDpmm) parameters

but it had no effects.

Thank you for your help

[primo-ppcg]

The font used for barcode interpretation lines is A, be sure this has been set in the FontLoader of the DrawerOptions (readme).

Also, don't send the PNG to the printer, send the ZPL!

EDIT: Could it be that you are drawing the under ^FR Field Reverse Print? The current implementation will pixelate true type fonts badly, as in the example above.

[devfservant]

Thank you for your reply!

Yes, we do use A symbols and the DrawerOptions.FontLoader option.

One of our requirements is to send PDF content to the printer rather than ZPL text.
Indeed, we build a web application and when you print something through a browser, you have a print preview pop-up
(which cannot be skipped, AFAWK)
Sending ZPL text would generate an "ugly" pop-up for our user, whereas sending a PDF produces a neater pop-up.

We may contribute again to this project to implement a sort of ZplToPdfConverter (as suggested in #115).
Thus, we would send vector data rather than raw images and this would surely fix any resolution issue

[primo-ppcg]

Perhaps you could also check if the issue has been resolved with the last commit via the online viewer. I noticed that when rendering text in reverse (^FR), it became very pixelated.

Before:

After: