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Re: Using imagettfbbox with Arial Bold [message #173273 is a reply to message #173255]

Fri, 01 April 2011 03:49

jwcarlton
Messages: 76
Registered: December 2010

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Member

> I'll try to explain myself better. A font file is basically a collection
> of mathematical primitives: a line here, a circle there, that stuff.
>
> If you want to display a letter on a printed document you need a program
> that takes those primitives and converts them into instructions for the
> printer on how to drop ink on the sheet. If you want to display a letter
> on a computer screen you need a program that converts the primitives
> into coloured pixels. And there are many possible ways to do that
> because random geometrical shapes do not normally map uniquely to pixel
> grids. Even in your own PC you'll see that fonts look completely
> different if you disable anti-aliasing, or if you optimise it for LCD
> panels or CRT monitors.
>
> Your CSS rules are rendered by the browser in the local PC and the
> browser can choose to handle the task to the operating system font
> libraries or use its own library. GD2 uses whatever version of the
> FreeType library is installed on the server.
>
> Why can't you compare GD2 with CSS? Because they use different programs
> to render the font, programs that do not even run on the same computer.
> Furthermore, you have certain amount control about the server (until you
> host upgrades PHP) but zero control about the browser.

OK, that makes sense. What I don't get, though, is why it's not
measuring correctly based on the way I've coded it? Like Natural said
(below), isn't it the same library rendering it for the screen as is
doing the measurement?

If it were an issue of the browser or monitor being off, then wouldn't
it be off for both Arial AND Arial Bold?

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[Message index]

		Using imagettfbbox with Arial Bold By: jwcarlton on Thu, 31 March 2011 04:26
		Re: Using imagettfbbox with Arial Bold By: alvaro.NOSPAMTHANX on Thu, 31 March 2011 07:16
		Re: Using imagettfbbox with Arial Bold By: jwcarlton on Thu, 31 March 2011 07:47
		Re: Using imagettfbbox with Arial Bold By: alvaro.NOSPAMTHANX on Thu, 31 March 2011 11:26
		Re: Using imagettfbbox with Arial Bold By: The Natural Philosoph on Thu, 31 March 2011 13:27
		Re: Using imagettfbbox with Arial Bold By: jwcarlton on Fri, 01 April 2011 03:49
		Re: Using imagettfbbox with Arial Bold By: alvaro.NOSPAMTHANX on Fri, 01 April 2011 07:26
		Re: Using imagettfbbox with Arial Bold By: jwcarlton on Tue, 05 April 2011 03:27

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