Canon iPF815 ユーザーズマニュアル

Move the Res slider to adjust the settings.
Res presents the following items for selection.

Setting

Details

Due to this low resolution, the image will print faster but its texture will appear
rough.

This high resolution will achieve the best results.

Select Dithering.

Setting

Details

Perform dithering on the printer.

Click the OK button.

Raster Graphics settings

PUse these settings to adjust the balance between the print quality, memory consumption, and the print speed of raster
graphics.

Click the Raster Graphics below Graphics.
The Device and Document Settings sheet opens and switches to the Raster Graphic settings.

Windows Software 

 HDI Driver 

Graphics Settings

iPF815