See Also: Reducing colors vs reducing color depth
Color depth is the maximum number of colors a raster image can contain.
How to tell what the color depth of an image is
When you load a raster image into Scan2CAD its color depth is displayed in the Title Bar after the raster image name:
Color depth = two. Images with a color depth of two contain two colors – black and white – and are also called 1 Bit images. (It is possible to get two color raster images that contain two colors other than black and white, but black and white are the norm.)
Color depth = 16. Images with a color depth of 16 contain up to 16 colors and are also called 4 Bit images.
Color depth = 256. Images with a color depth of 256 contain up to 256 colors or shades of gray and are also called 8 Bit images. Images that contain shades of gray rather than colors are called grayscale.
Color depth = 16.7 million. Images with a color depth of 16.7 million contain up to 16.7 million colors and are also called 24 Bit images.
How the color depth of an image is determined
Color depth is determined by the color option you select when you scan a drawing.
There are usually several color options you can choose from when scanning a drawing. These options have different names depending on the scanner software you are using but are typically:
Change the color depth of an image
Why you should always use the smallest possible color depth
You should always use the smallest possible color depth because color depth has a significant effect on image size.
For example, suppose you scan an E or A0 size drawing at a resolution of 300 dpi.
Images with a color depth greater than 16.7 million colors
If you load an image with a color depth greater than 16.7 million colors into Scan2CAD, Scan2CAD will automatically reduce its color depth to 16.7 million colors.
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