Operation Manual

552 | CorelDRAW X8 User Guide
Cobblestone Elephant skin Etching
Plastic Relief sculpture Stone
Working with colors in bitmaps
CorelDRAW lets you change colors in monochrome images, apply PostScript halftone screens to optimize color and black-and-white bitmaps
for printing, hide and show colors, and mask colors. Monochrome bitmaps have two colors: black and white. You can replace the black and
white pixels with any color on a color palette.
If you plan to print to a PostScript printer, you can optimize color or black-and-white printing by applying a halftone screen to an image.
Halftone screens break down an image into small dots or lines for clearer printing, continuous tones, and special effects. However, you can
see the effect of the screen on the bitmap only after you print it on a PostScript printer. For information about making changes to halftone
screens, see “To customize a halftone screen” on page 616.
You can hide and display selected colors by masking them. Hiding colors in a bitmap lets objects or backgrounds show through the image.
Hiding a color can also alter the apparent shape of a bitmap. For example, if a bitmap shows a person on a black background, you can
hide the background so that the bitmap appears to take on the shape of the person rather than a rectangular shape. Also, hiding colors in
bitmaps can increase the speed at which objects are rendered on the screen. You can also display certain colors in a bitmap to change the
appearance of the image or to see where a particular color has been applied. You can mask as many as 10 colors in a bitmap.
Color masking also lets you change selected colors without altering the other colors in an image. You can also save a bitmap color mask to a
file and open the file for future use.
To color a monochrome bitmap
1
Select a bitmap by using the Pick tool .
2 Right-click a color on the color palette to change the color of the foreground (black) pixels.
3 Click a color on the color palette to change the color of the background (white) pixels.