objective c - iOS Core-Graphics: Using CGContext setters to render a sharp pdf -

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i'm working on pdf renderer using cgpdf , catiledlayer in ios , except fonts it's if vectors close , kind of fuzzy i'm not wearing glasses. solution i'm looking , i'd love make grey pixels near edge black. guessing possible cgcontextset"whatever"() method. here photo illustrate.

currently rendering as... current

adobe reader app rendering as...

adobe

and looks sharp, if know method uses (or how similar) i'll ecstatic

but i'm trying work around turn grey pixels black. like... fine

again using cgcontext setter methods , noticing changes, not documentation clear on each does, explanation or insight solutions appreciated. in advance.

it looks adobe's renderer aligning bottoms of glyphs whole pixels, yours not.

these 2 messages on quartz-dev mailing list (one, two) suggest should try changing settings subpixel positioning , subpixel quantization, using following functions:

cgcontextsetallowsfontsubpixelpositioning cgcontextsetshouldsubpixelpositionfonts cgcontextsetallowsfontsubpixelquantization cgcontextsetshouldsubpixelquantizefonts

either turn off subpixel positioning entirely, or turn on both subpixel positioning , subpixel quantization. you'll have experiment.

post-processing quartz's rendering unlikely good, you've demonstrated.


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