The Two Keys effect allows you to transform an image (change color tints, replace colors, adjust contrast and brightness etc.) using two key colors.
The effect has the following controls that are represented by two color boxes:
In the Black Point color plate choose a color that will be used as a black key. In the White Point color plate choose a color that will be used as a white key. By default the corresponding colors are chosen, and your image is in its original state.
How to define the other key colors:
- Click on the color box (the pointer will transform into an eyedropper), choose the necessary color on the image and left-click it. The color box will change its color to the selected one.
- Double-click on the color box to open the Select Color dialog.
As a result, all colors that are darker than the black key will shift to the black color; all colors that are lighter than the white key will shift to the white color.
You can also set only one key color (black key or white key). If you define only the black key, the dark colors will shift to the black color, while the light colors will not change.
Please note, that the lighter the black key color is, the darker the image will be; the darker the white key color is, the lighter your image will be.
Note: If you don't want to change the color shades on your image, use the color grey as the key color (in this case the color components (green, red and blue) are equal).
If the Fixed Preview Area check-box is enabled, all changes will be displayed in a small preview area. If the check-box is disabled, the changes will be applied to the area visible in the Image Window.
Click Default to restore the original settings.
Click OK to apply the changes to the image and close the effect dialog box.
Click Cancel to close the dialog box without applying changes.