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I am working with a pdf Document that uses Type3 fonts. The object stream has 

3.6 -16.56 Td /F1 1 Tf

which specifies the font and font size.

I understand that the Type3 fonts are transformed from glyph to text space using FontMatrix.

Does the FontMatrix also impact the font size? If so, how?

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  • The PDF font definition (including its font matrix!) is expected to define "the glyphs at one standard size. This standard is arranged so that the nominal height of tightly spaced lines of text is 1 unit. In the default user coordinate system, this means the standard glyph size is 1 unit in user space, or 1 ⁄ 72 inch." Obviously you can technically create a font definition with glyphs that in the user space go beyond that 1 unit, or that only cover a tiny portion of it, e.g. via the font matrix. But such font definitions would violate the expectations of the PDF spec.
    – mkl
    Commented Nov 11, 2022 at 8:59

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Does the FontMatrix also impact the font size? If so, how?

No, it doesn’t. That would be completely wrong. FontMatrix is something fixed for the entire font, whereas font size may be different for every text output.

There is at least one more way of setting font size using text matrix:

/F1 1 Tf
% Font size is 30pt
30 0 0 30 10.455 219.89999 Tm
(F) Tj
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