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Color depth

 

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

How the color depth of an image is determined

Change the color depth of an image

Why you should always use the smallest possible color depth

Images with a color depth greater than 16.7 million colors

 

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:

Monochrome, Black and White Drawing, Line Art or 1 Bit. These options create images with a color depth of two. They may be hidden within your scanner software and can sometimes be found in the section where you set scanning speed.
Grayscale or Black and White Photo. These options create grayscale images with a color depth of 256.
Color or Color Photo. These options are normally the default and create images with a color depth of 16.7 million.

 

Change the color depth of an image

You can decrease or increase the color depth of an image in Scan2CAD. See Reduce color depth and Increase color depth.

 

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.

If you scan it with a color depth of two it will take up about 16Mb of memory.
If you scan it with a color depth of 256 it will take up about 128Mb of memory.
If you scan it with a color depth of 16.7 million it will take up about 385Mb of memory.

 

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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