Change a single pixel value in a Grayscale JPEG image

2 次查看（过去 30 天）
LOKESH
LOKESH 2012-4-25
I have a grayscale jpeg image X. I want to change its pixel value. For example change pixel at (14,20) to 1,How can I do it. I tried the following but it doesn't WORK:
Xc=X; %Xc is image with a pixel value changed from X[X is original image]
X(14,20); %What is the value at 14,20
Xc(14,20)=1 %Change Pixel value at 14,20 to 1
When i view its values in Variable Editor,I don't get value changed at (14,20) in Xc image.
What are the Errors or suggestion?

请先登录，再回答此问题。

采纳的回答

Thomas
Thomas 2012-4-25
Are you sure you are checking Xc in the variable editor, you might be checking X (original image). the above does work..
I have tried
X=imread('1.jpg') % My image was color so was MxNxP
Xc=X(:,:,1) % crateda grayscale image MxN
Xc(14,20) % here my output was ans=129
Xc(14,20)=1 % changed the value of (14,20) to 1
Xc(14,20) % here my output was ans=1
If I change a block of values in Xc to 1 and do the imshow(Xc) - gives me a black box..

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Images 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by