Use the Draw | Image | Colors | Convert Depth command to reduce the image color depth to 256 colors or grayscale. This feature is useful when the file size is very large. Converting the image color depth reduces the memory overhead and allows the program to process information more quickly.
Choose 256 colors to convert the selected image to 256 colors, or click the Grayscale button to convert the image color depth to eight shades of gray.
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