### Printing

> DS9 provides strong Postscript printing support. This is not a screen capture method, but a full level 1 and level 2 postscript driver. The postscript images generated are detailed and accurate as possible, given the resolution of the data, and the printing resolution.

> Postscript Level

> > Level 1-- The postscript generated consist of a color lookup table and image data, encoded in `ASCIIHEX`. All line graphics and text are postscript elements.

> > Level 2-- The postscript generated consist of a color lookup table and image data, compressed with RLE, and encoded in `ASCIIHEX85.` All line graphics and text are postscript elements.

> Postscript Color Model

> DS9 supports three color models for level 2 postscript. All three color models generate approximately the same size files.

> > `RGB
> > CMYK
> > Grayscale
> > `

> Resolution

> Most printers dither to achieve various levels of gray or color. So a 300 dpi printer's affective resolution may only be 53 dpi after dithering. This is fine for analysis and proofs. On the other hand, when generating images for publication, color separation is used to achieve the full resolution of the printer . A 150 dpi CMYK image will generate four 150 dpi images (one for each color). In general, select the lowest resolution possible, as postscript file size grows by the square of the increase.