protected function fixLatexDpi() {
		$fix = false;
		if ( ! $fix && ! empty( $_GET['optimize-for-print'] ) ) {
			$fix = true;
		}
		if ( ! $fix && strpos( $this->url, 'optimize-for-print=1' ) !== false ) {
			$fix = true;
		}
		if ( ! $fix && stripos( get_class( $this ), 'print' ) !== false ) {
			$fix = true;
		}

		if ( $fix ) {
			$this->url .= '&pb-latex-zoom=3';
			$this->cssOverrides .= "\n" . 'img.latex { prince-image-resolution: 300dpi; }' . "\n";
		}
	}
protected function fixLatexDpi() {
		$fix = false;
		if ( ! $fix && ! empty( $_GET['optimize-for-print'] ) ) {
			$fix = true;
		}
		if ( ! $fix && strpos( $this->url, 'optimize-for-print=1' ) !== false ) {
			$fix = true;
		}
		if ( ! $fix && stripos( get_class( $this ), 'print' ) !== false ) {
			$fix = true;
		}

		if ( $fix ) {
			$this->url .= '&pb-latex-zoom=3';
			$this->cssOverrides .= "\n" . 'img.latex { prince-image-resolution: 300dpi; }' . "\n";
		}
	}
protected function fixLatexDpi ( ) { $ fix = false ; if ( ! $ fix && ! empty ( $ _GET [ 'optimize-for-print' ] ) ) { $ fix = true ; } if ( ! $ fix && strpos ( $ this -> url , 'optimize-for-print=1' ) !== false ) { $ fix = true ; } if ( ! $ fix && stripos ( get_class ( $ this ) , 'print' ) !== false ) { $ fix = true ; } if ( $ fix ) { $ this -> url .= '&pb-latex-zoom=3' ; $ this -> cssOverrides .= "\n" . 'img.latex { prince-image-resolution: 300dpi; }' . "\n" ; } }
Increase PB-LaTeX resolution to ~300 dpi

@see symbionts/pressbooks-latex/automattic-latex-wpcom.php
Increase PB - LaTeX resolution to ~300 dpi