Displaying colors in a figure
in [Matlab]
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From: Tobias van der Neut on 23 Feb 2010 08:14 Hello, I got a question about displaying images, I hope someone can help me. I want to display the image in a figure as it is, that means with all colors right. If I use the commands figure; imagesc(picture); hold on; all colors in the image are mixed up. I also tried figure; imagesc(picture); colormap(xy); hold on; with all available colormaps in Matlab, but the results were not satisfying. Is there any possibility to display my image as it is? I also tried formats from .bmp to .gif, it didn't work. Thanks & best regards Tobias
From: Steven Lord on 23 Feb 2010 09:47 "Tobias van der Neut" <tobias-v-d-neut(a)arcor.de> wrote in message news:hm0kas$cr3$1(a)fred.mathworks.com... > Hello, > > I got a question about displaying images, I hope someone can help me. > I want to display the image in a figure as it is, that means with all > colors right. If I use the commands > > figure; > imagesc(picture); > hold on; > > all colors in the image are mixed up. > > I also tried > > figure; > imagesc(picture); > colormap(xy); > hold on; > > with all available colormaps in Matlab, but the results were not > satisfying. Is there any possibility to display my image as it is? I also > tried formats from .bmp to .gif, it didn't work. Try calling IMREAD with two outputs to read in your image data. If the second output is nonempty, as I suspect it will be, that's the colormap you should use in your call to COLORMAP. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Rich Ellis on 23 Feb 2010 10:05 What is "picture"? Do you have the associated colormap? Perhaps what you need to do is use imread with your .bmp or .gif file to generate the proper data. See the imread documentation: >> doc imread You probably need to do something like this: [img,cmap] = imread('imagefilename.gif'); figure imagesc(img) colormap(cmap) "Tobias van der Neut" <tobias-v-d-neut(a)arcor.de> wrote in message news:hm0kas$cr3$1(a)fred.mathworks.com... > Hello, > > I got a question about displaying images, I hope someone can help me. > I want to display the image in a figure as it is, that means with all > colors right. If I use the commands > > figure; > imagesc(picture); > hold on; > > all colors in the image are mixed up. > > I also tried > > figure; > imagesc(picture); > colormap(xy); > hold on; > > with all available colormaps in Matlab, but the results were not > satisfying. Is there any possibility to display my image as it is? I also > tried formats from .bmp to .gif, it didn't work. > > Thanks & best regards > Tobias >
From: Cokelid on 23 Feb 2010 11:08 On Feb 23, 8:14 am, "Tobias van der Neut" <tobias-v-d-n...(a)arcor.de> wrote: > I want to display the image in a figure as it is, that means with all colors right. If I use the commands > imagesc(picture); Tobias, you'll need to explain what the variable "picture" is if anyone is to have a hope of helping you. Please think carefully about your question.
From: Tobias van der Neut on 23 Feb 2010 13:01
Cokelid <cokelid(a)googlemail.com> wrote in message <d3fc3362-eb40-42ad-9c7c-c5489f3d2991(a)t21g2000vbo.googlegroups.com>... > On Feb 23, 8:14 am, "Tobias van der Neut" <tobias-v-d-n...(a)arcor.de> > wrote: > > I want to display the image in a figure as it is, that means with all colors right. If I use the commands > > imagesc(picture); > > Tobias, you'll need to explain what the variable "picture" is if > anyone is to have a hope of helping you. Please think carefully about > your question. I now have implemented: [image, cmap] = imread('picturename.bmp'); figure; imagesc(image); colormap(cmap); hold on; The test picture is a black circle, a blue triangle and a red rectangle. With this implementation I get the right colors of the objects but there is a noisy boundary around each object with varying colors. And these boundaries are unwanted. What else do I have to specify? I am sorry, I am kinda new to Matlab and this forum... |