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Drakos/Moore

To: Figures, Tables and Arbitrary Images

Quality of Printed Images

Since it is often desirable to get a good quality print on paper directly from the browser, here are the same equations as earlier. This time the `extrascale=' option has been used with a value of 1.5. More than twice the number of pixels are available, for a cost of approximately 1.7 times the disk-space⁹.

Figure 3: Displayed math environments with extra-scale of 1.5

 

$$\Phi_{l+1,m,n} = \Bigl(\Phi+h\frac{\partial\Phi}{\partial x}... ...\frac{\partial^3\Phi}{\partial x^3} + \ldots \Bigr)_{l,m,n}$$ (4)

$$\begin{eqnarray} \frac{\Phi_{l+1,m,n}-2\Phi_{l,m,n}+\Phi_{l-1,m,n}}{h^{2}} + \fr... ...hi_{l,m,n+1}-2\Phi_{l,m,n}+\Phi_{l,m,n-1}}{h^{2}} = -I_{l,m,n}(v) \end{eqnarray}$$

On-screen these images appear slightly blurred or indistinct. However there can be marked improvement in the print quality, when printed from some browsers; others may show no improvement at all. The ``anti-aliasing'' helps on-screen. In the printed version jagged edges are indeed softened, but leave an overall fuzziness.

Here are the same equations yet again; this time with `extrascale=2.0'. Now there are 4 times the pixels at a cost of roughly 2.45 times the disk space. Compared with the previous images (having 1.5 times extra-scaling), there is little difference in the on-screen images. Printing at 300dpi shows only a marginal improvement; but at 600dpi the results are most satisfying, especially when scaled to be comparable with normal 10pt type.

Figure 4: Displayed math environments with extra-scale of 2.0

 

$$\Phi_{l+1,m,n} = \Bigl(\Phi+h\frac{\partial\Phi}{\partial x}... ...\frac{\partial^3\Phi}{\partial x^3} + \ldots \Bigr)_{l,m,n}$$ (5)

$$\begin{eqnarray} \frac{\Phi_{l+1,m,n}-2\Phi_{l,m,n}+\Phi_{l-1,m,n}}{h^{2}} + \fr... ...{l,m,n+1}-2\Phi_{l,m,n}+\Phi_{l,m,n-1}}{h^{2}} = -I_{l,m,n}(v)\;. \end{eqnarray}$$

Footnotes

... disk-space⁹

This figure varies with the graphics format used, and the complexity of the actual image.

To: Figures, Tables and Arbitrary Images

Ross Moore 1991-03-26

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