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Reference
Preferences
Graphics Options
RenderingOptions
"ImageCacheDepth"
• "ImageCacheDepth" is an option for cells that determines the depth of the cache used for storing bitmapped images.
• The depth of the image cache, that is the number of bits per pixel, depends on the resolution of the monitor being used. When working on multiple monitors with different resolutions, the depth of the image cache must be explicitly specified. With the default setting "ImageCacheDepth" 
DeepestScreen, the cache depth is determined by the monitor with the highest resolution.
• With the setting "ImageCacheDepth" WindowDepth, the cache depth is determined by the last monitor on which the image was rendered.
• "ImageCacheDepth" can also be specified explicitly as the number of bits per pixel.
