how to create a black image?
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how can i create a black image, not a gray one?
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Cris LaPierre
2018-12-8
编辑：Cris LaPierre
2018-12-8
If you have to use imagesc, keep in mind that an image has to have values for R, G and B for each pixel. That means you matrix needs to be 256x64x3.
Try using imagesc with this
img=zeros(256,64,3,'uint8');
3 个评论
Jia Yu
2018-12-8
Image Analyst
2018-12-8
You can also create a gray scale image, rather than an RGB color image if you do
img = zeros(256, 64, 'uint8');
Also note that imagesc() does not require a color image. You can pass it a grayscale image. However it, for some weird reason, pseudocolors it. To turn off the colormap, you can apply a colormap of all grays:
grayImage = imread('cameraman.tif'); % Read in a gray scale image.
imagesc(grayImage); % Display it with a funky colormap
colormap(gray(256)); % Turn the colormap off by making it normal gray.
Jia Yu
2018-12-11
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