im2double (Image Processing Toolbox User's Guide)

Image Processing Toolbox User's Guide

Convert image to double precision

Syntax

I2 = im2double(I)
RGB2 = im2double(RGB)
I = im2double(BW)
X2 = im2double(X,'indexed')

Description

im2double takes an image as input, and returns an image of class double. If the input image is of class double, the output image is identical to it. If the input image is not double, im2double returns the equivalent image of class double, rescaling or offsetting the data as necessary.

I2 = im2double(I) converts the intensity image I to double precision, rescaling the data if necessary.

RGB2 = im2double(RGB) converts the truecolor image RGB to double precision, rescaling the data if necessary.

I = im2double(BW) converts the binary image BW to a double-precision intensity image.

X2 = im2double(X,'indexed') converts the indexed image X to double precision, offsetting the data if necessary.

Class Support

Intensity and truecolor images can be uint8, uint16, double, logical, single, or int16. Indexed images can be uint8, uint16, double or logical. Binary input images must be logical. The output image is double.

Example

I1 = reshape(uint8(linspace(1,255,25)),[5 5])
I2 = im2double(I1)

See Also

double, im2single, im2int16, im2uint8, im2uint16.

im2col im2int16