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Working with colors in bitmaps in CorelDRAW

Working with colors in bitmaps in CorelDRAW

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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 only see the screen's effect on the bitmap after you print it on a PostScript printer. For information about making changes to halftone screens, see "To customize a halftone screen."

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 image's appearance or 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.

 

Process to color a monochrome bitmap

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To color a monochrome bitmap 

1. Select a bitmap 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.

 

Process to apply a screen to a bitmap

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To apply a screen to a bitmap

1. Select a bitmap using the Pick tool .

2. Open the Fill flyout , and click the Fill color dialog button .

3. Click the Palettes tab.

4. Choose a fixed palette from the Palette list box.

5. Click Options and click PostScript options.

6. Choose an option from the Type list to set the dot shape or line type.

7. Type a value in the Frequency box to set the number of dots or lines that appear in each inch of the screen.

8. Type a value in the Angle box to set the angle of the dots or lines that appear on the screen.

 

Process to hide or display a color in a bitmap

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To hide or display a color in a bitmap

1. Select the bitmap using the Pick tool .

2. Click Bitmaps Bitmap color mask.

3. Enable one of the following options:

   • Hide colors

   • Show colors

4. Enable the check box next to the channel that you want to hide or display.

5. Move the Tolerance slider to set the color tolerance for the color.

6. Click the Color selector button .

7. Click the bitmap, and click the color that you want to hide or display.

8. Click Apply.

Higher tolerance levels target a broader range of colors around the color you select. For example, if you select baby blue and increase the tolerance, CorelDRAW hides
   or displays pastel blue, electric blue, and so on.

 

Process to open a bitmap color mask

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To open a bitmap color mask

1. Click Bitmaps Bitmap color mask.

2. Click the Open mask button .

3. Choose the folder where the color mask file is stored.

4. From the Files of type list box, choose a file type.

5. Double-click the file.

Files containing bitmap color mask have the filename extension .ini.

 

Process to change a masked color

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To change a masked color

1. Click Bitmaps Bitmap color mask.

2. Choose a color from the list of masked colors.

3. Click the Edit color button .

4. Use the controls in the Select color dialog box to edit the color.

You can also
 
Save a bitmap color mask
Click the Save mask button . Choose the folder where you want to save the current color mask. Type a name for the file in the File name list box. Click Save.


You can also change a masked color by clicking the Color selector button , selecting another color from the bitmap, and clicking Apply.
 

Copyright 2000-2005 Corel Corporation. All rights reserved.

 

 

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Welding and intersecting objects in CorelDRAW

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Adding bitmaps in CorelDRAW

Cropping and editing bitmaps in CorelDRAW

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Working with colors in bitmaps in CorelDRAW

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Transforming color and tone effects in CorelDRAW

Removing dust and scratch marks from bitmaps in CorelDRAW

Editing bitmaps in Corel PHOTO-PAINT in CorelDRAW

Tracing bitmaps in CorelDRAW

Previewing traced results in CorelDRAW

Controlling the colors of traced results in CorelDRAW

Changing the color mode of bitmaps in CorelDRAW

Changing bitmaps to black-and-white images in CorelDRAW

Changing bitmaps to the paletted color mode in CorelDRAW

Changing bitmaps to duotones in CorelDRAW

Using preset Internet objects in CorelDRAW

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Previewing print jobs in CorelDRAW

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Printing colors accurately in CorelDRAW

Printing to a PostScript printer in CorelDRAW

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Printing printers’ marks in CorelDRAW

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Printing color separations in CorelDRAW

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Moving and copying color styles in CorelDRAW

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Opening and editing custom color palettes in CorelDRAW

Setting color palette properties in CorelDRAW

Understanding the Color management dialog box in CorelDRAW

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Choosing advanced color management settings in CorelDRAW

Correcting colors for display in CorelDRAW

Contouring objects in CorelDRAW

Applying perspective to objects in CorelDRAW

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Editing lenses in CorelDRAW

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