Starting with a grayscale image, how can I colour a certain pixel based on its x,y coordinates?

7 次查看（过去 30 天）
Naim
Naim 2017-6-29
编辑： Swarooph 2017-6-29
I have a 256 by 256 grayscale image. I want to colour a certain coordinating (say 125,125) red. Do I need to convert the entire image into truecolour? I want to keep the greyscale image how it was other than the coloured pixel. Would gray2ind seems like the appropiate first step, but I'm not sure how to go from there.
Thanks in advanced!
  2 个评论
John BG
John BG 2017-6-29
you don't have to convert the image to true color, but you can if the only code available you use can only work in one specific image format. Changing image format is easy in MATLAB.
Would you please supply a sample image so readers can show you different ways to alter single pixels.
John BG <mailto:jgb2012@sky.com jgb2012@sky.com>
Naim
Naim 2017-6-29
Hey John thanks for your reply. I just want to add a colour pixel for testing purposes really. I didn't include a picture because the grayscale image I am using is irrelevant (I want to change specific pixels based on coordinates) but I went ahead and attached a photo anyway. Could you elaborate on how I could add the colour pixel to my grayscale photo? I'd appreciate the help!

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Swarooph
Swarooph 2017-6-29
编辑：Swarooph 2017-6-29
Take a look at the question and answer here.
Note that grayscale images cannot have color pixels by definition. If you are just interested in marking a pixel with a marker you can use the plot function as discussed in the above answer's comments or use the insertMarker function.

类别

在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by