Font sizes for news downloads

[medvedev]

Hello,
I'm new with calibre, like this application well and I'm using it mainly for downloading news. And here I have got a little problem:

When I download the any news source and transfer it to my eReader by clicking on "send to device" I always get tiny font sizes like here:


My device is the Onyx Boox M92 with a screen size of 9.7".

Of course I can increase the font sizes with my reader, but then I get very big titles.

I there any possibility to increase the smaller font size without icreasing the title sizes? I have already read this help, but it doesn't work
For testing purposes I adjusted calibre in that way:

I expected that every font size would become equal but nothing has changed when I downloaded the news again and transferred it to my device. Everything remains like before.

Does anybody know what I'm doing wrong?

Thank You!

[kovidgoyal]

If you want to pass conversion options to the recipe download system, use the conversion_options parameter in the recipe, setting global conversion options will not apply to news downloads. In your case you need

conversion_options = {'font_size_mapping': whatever}

You can get the values by running a conversion in the GUI with the values you want and looking at the conversion log.

[medvedev]

Thank You kovidgoyal!
I've never heard about recipes before, but in the last days I read a lot about them. I see it's very complicated to read news with an e-Book Reader yet. :/

I can now change my font size with:
conversion_options = {'base_font_size' : ##}

Your suggestion don't have any effect
conversion_options = {'font_size_mapping': ##}

But I'm not able to change different sizes individualy like:
Font size key : 7, 8, 10, 12, 14, 16, 18, 20
If I increase all font sizes in the same manner I get monstrous headlines.

Thanks!