Kindle PW5 Font Scale

[Waylander]

I'm playing around with the FONT_RAMP for my PW5, but am slightly confused as to the font scale. What is the measurement for the font sizes, and what is the name and amount to increase each of the sizes? I've seen something about .em points, but don't know how many of these it takes to make each of the fourteen font sizes increase by "one .em". At the moment I'm making a rough guesstimate for increasing/decreasing the third font size, which is the one I use most, but it's not very precise.

[JSWolf]

Originally Posted by Waylander

I'm playing around with the FONT_RAMP for my PW5, but am slightly confused as to the font scale. What is the measurement for the font sizes, and what is the name and amount to increase each of the sizes? I've seen something about .em points, but don't know how many of these it takes to make each of the fourteen font sizes increase by "one .em". At the moment I'm making a rough guesstimate for increasing/decreasing the third font size, which is the one I use most, but it's not very precise.

Here is a good tutorial on FONT_RAMP.

https://www.kboards.com/threads/usin...choices.235619

[Waylander]

Originally Posted by JSWolf

Here is a good tutorial on FONT_RAMP.

https://www.kboards.com/threads/usin...choices.235619

Thankyou for the link. I found a post from 2017 on here with the default font scales for 167ppi, 212ppi, and 300ppi Kindle screens, so used that as a baseline. I'm ok with doing the basic hack and have been doing so for a few years now so that's not the problem. My main issue, which the linked tutorial doesn't address, is what the unit of measurement is for the fonts. I'm looking for more precision in adjusting the font scale, so am looking for how much each increases in terms of this unit. I've seen ".em points" mentioned around here, and I'm wondering what the amount of .em points is for one increase in font size.

[shamanNS]

Originally Posted by Waylander

I found a post from 2017 on here with the default font scales for 167ppi, 212ppi, and 300ppi Kindle screens, so used that as a baseline.

My old comment? :P


https://www.mobileread.com/forums/sh...&postcount=153


IIRC last time I played with FONT_RAMP values there was no visible font size change in the UI if the difference between 2 adjacent size options was lower than something like 0.4x, for 300ppi screens.

[j.p.s]

Originally Posted by Waylander

Thankyou for the link. I found a post from 2017 on here with the default font scales for 167ppi, 212ppi, and 300ppi Kindle screens, so used that as a baseline. I'm ok with doing the basic hack and have been doing so for a few years now so that's not the problem. My main issue, which the linked tutorial doesn't address, is what the unit of measurement is for the fonts. I'm looking for more precision in adjusting the font scale, so am looking for how much each increases in terms of this unit. I've seen ".em points" mentioned around here, and I'm wondering what the amount of .em points is for one increase in font size.

Originally Posted by shamanNS

My old comment? :P


https://www.mobileread.com/forums/sh...&postcount=153


IIRC last time I played with FONT_RAMP values there was no visible font size change in the UI if the difference between 2 adjacent size options was lower than something like 0.4x, for 300ppi screens.

That is pretty close. It has been a long time since I did anything with FONT_RAMP but I think this post
https://www.mobileread.com/forums/sh...5&postcount=54
has the most correct description of the numbers in the FONT_RAMP file. That is they are the font size in increments of 0.01 inches, so 7.01 is 0.0001 inch taller than 7.00

At 300 DPI a pixel is about 0.0033 inches in size, so a step of 0.34 would change the font size by 1 pixel (at 300 DPI).

So the answer to the original question is that the units are 0.01 inches, regardless of DPI, so a value of 14.00 has a font height of 0.14 inches.

[j.p.s]

Originally Posted by JSWolf

Here is a good tutorial on FONT_RAMP.

https://www.kboards.com/threads/usin...choices.235619

That is misleading and is now also obsolete. The number of entries has been 14 for years, well before the PW5

[JSWolf]

Originally Posted by j.p.s

That is misleading and is now also obsolete. The number of entries has been 14 for years, well before the PW5

I'll have a look at my PW3 and see how many font size choices it has.

[jackm8]

You can ditch font_ramp 'hack' and modify font sizes by editing style.css of ebooks as well. Or you can use both, to fine tune it that way.

Setting to change or add is stated either as:
font-size: 1em;
or
font-size: 100%

They do the same thing, so you use either one of them. 1.1 equals 110%, 0.9em equals 90%. etc...
Setting defines fonts scale. 1em, equals font at 12pt. Resolution of the device effects this setting a lot, so there's need to experiment a little with settings to achieve whatever you wish.

Obviously this is book specific setting, and need to be changed for each individual book. It does work on various formats, though.

[j.p.s]

Originally Posted by JSWolf

I'll have a look at my PW3 and see how many font size choices it has.

My PW3 running 5.9.6.1 has 14 font size choices.

[Waylander]

Originally Posted by shamanNS

My old comment? :P


https://www.mobileread.com/forums/sh...&postcount=153


IIRC last time I played with FONT_RAMP values there was no visible font size change in the UI if the difference between 2 adjacent size options was lower than something like 0.4x, for 300ppi screens.

Yes! Thankyou, it was what made FONT_RAMP work in the first place for me.

The other posts here about the size of the increments have been very helpful. Many thanks.