How to display 518*518 resolution gray scale images in small axes, with gray scale only

Hi, I am new to MATLAB.I want to display 7 Images all of are gray scale images on The screen, for that i have taken 7 axes.

But when the image gets displayed in axes they are not appear in gray scale, they appear as colour images and when the same

image is displayed in Figure window it is displayed as original gray scale image. My images size is 518*518.i want the images

to be in gray scale only in all the axes. How to solve this problem? and also i don't want to reduce the

size of the images. Thanks in advance

Answer 1

[Walter Roberson]

There is one colormap per figure, so a single colormap(gray) will do. However if you need to display a color image somewhere in the same figure, you are going to run in to problems.

The easiest way to solve these problems would be to take your grayscale image and use

RGBImage = repmat(GrayImage,1,1,3);

and then display RGBImage . This will convert the image from being a pseudocolor image affected by colormaps, in to being a truecolor image that is independent of colormaps.

[aatish wankhede]

Hello Sir, When i try Your code given above but it gives me an Error Too many input arguments for Function repmat. I also read the topic from the Help on repmat but i am not able to understand it. I change some of the parameters but it won't work.Plz guide me.

[Jan]

This is explained well in the help text.

RGBImage = repmat(GrayImage, [1,1,3])

Another approach:

RGBImage = cat(3, GrayImage, GrayImage, GrayImage);

Or:

RGBImage = GrayImage(:, :, ones(1,3));

[aatish wankhede]

Hi, Thanks for ur help. But one problem is when i tried to perform the convolution with RGBImage ,i get the error :- "Error

while evaluating uicontrol Callback". Why this? when the same code is working perviously when the Original gray scale image

come in colour.