Plotting grey scale images.

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suchitra rani 2019-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/477179-plotting-grey-scale-images

评论： Rik 2019-8-22

mat_vv.JPG

Hello ,

I am trying to plot grey scale images of size 631 x 661 having negative values ranging from -21.35 to -13.26.After reading the image ,it shows black pixels unless [] are given.I want to plot geoshow command.How can i do it. I tried geoshow command but it gives images of black pixels ..

I=imread('GBGEO.tif') ;

VV=I(:,:,2);

imshow(VV,[]).

geoshow(lat,long,VV)

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Rik 2019-8-22

Most function will assume images of type double have a data range of [0 1], unless you tell them otherwise. The documentation for geoshow is a bit unclear about this, but it seems to follow the same convention.

You should rescale your data to whatever you're expecting to be the data range. Using [] with imshow implicitly rescales your data to [0 1], so like this:

data=(data-min(data(:)))/(max(data(:))-min(data(:)));

(actually it sets the caxis instead of changing your data)

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