convertrgb2gray.m

Color to gray conversion.

Description

Very often color images use a colorbar between darks blue and red, through yellow, which is converted to gray on top and bottom, and white in the middle. With this function you can use a portion of the original image as a colorbar, which
is used as a reference for the corresponding levels of gray, obtaining a final image with black on one side and white on the opposite side.

• MATLAB release: MATLAB 5.2 (R10)
• Other requirements: None

[Yuvi Kahana]

A very useful tool which converts accuratelly jpg color images (red to blue)to gray scale (black to white) images

[Orlando Mendoza Navarro]

A very useful tool

[Amorn Wongsarnpigoon]

Fantastic! This code saved me hours of work. Before running the code, all I had to do was isolate the colorbar in the original image and save it in a separate file.

I'm not too familiar with image processing, but I think the values in the final gray images ('K' and 'K2') need to be divided by 255 to normalize the values from 0-1 rather than from 0-255. The grayscale jpegs didn't show up properly until I did this.

Also, if you don't have the Image Processing toolbox, then you need to comment out/replace "imshow" near the bottom of the code.

[KAUSTAV BHATTACHARYYA]

Pls let me know how do i run this file using matlab.. i am totally new to matlab.. i would appreciate if someone could explain me the steps and how i can use this code to convert a color bitmap image to grayscale image... pls help!!!