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Converting an image to Bitmap mode reduces the image to two
colors, greatly simplifying the color information in the image and
reducing its file size. To convert an image to Bitmap mode, you
must first convert it to Grayscale mode. This removes the hue and
saturation information from the pixels and leaves just the
brightness values. However, because few editing options are
available for Bitmap-mode images, it's usually best to edit the
image in Grayscale mode and then convert.
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