| #define SET_SCREEN_ANGLE 4105 |
| short Control(lpDevice, SET_SCREEN_ANGLE, lpAngle, NULL) | |||
| LPPDEVICE lpDevice; | |||
| LPINT lpAngle; |
The SET_SCREEN_ANGLE escape sets the current screen angle to the desired angle and enables an application to simulate the tilting of a photographic mask in producing a separation for a particular primary color.
Four-color process separation is the process of separating the colors comprising an image into four component primaries: cyan, magenta, yellow, and black. The image is then reproduced by overprinting each primary. In traditional four-color process printing, half-tone images for each of the four primaries are photographed against a mask tilted to a particular angle. Tilting the mask in this manner minimizes unwanted moire patterns caused by overprinting two or more colors.
lpDevice
Points to a PDEVICE structure specifying the destination device.
lpAngle
Points to a 16-bit variable specifying the desired screen angle in tenths of a degree. The angle is measured counterclockwise.
This escape returns the previous screen angle.
The default screen angle is defined by the device driver.