Corel PaintShop Pro X7, DE User's Guide Page 637

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Working with advanced color features 633
If you are increasing or decreasing several images to the same
color depth, you can add a button to the toolbar that you can
click to automatically set color depth. For more information, see
“Customizing toolbars” on page 663.
Decreasing the color depth of an image
If you are creating an image for on-screen viewing, you can decrease
the number of colors to reduce the file size and ensure the image
displays properly.
Before decreasing the color depth, consider the following:
Most Corel PaintShop Pro effect and correction commands work
on 16 million-color and grayscale images only.
When you decrease the color depth, Corel PaintShop Pro flattens
the image, which merges the data on all layers. However, you can
add vector layers to images of any color depth.
If you are creating images for the Web, we recommend that you work
with 16 million color (24-bit) images in the PspImage file format. After
editing the images, you can reduce the color depth of the images and
prepare them for the Web by exporting the images using the GIF
optimizer, JPEG optimizer, or PNG Optimizer.
Depending on the current color depth of your image, you can decrease
its color depth to the color depths described below.
2 colors (1-bit)
You can create a black-and-white image by decreasing the color depth
of an image to 2 colors. For example, if your image is already black-
and-white, you can change the color depth to two colors to reduce the
file size.
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