Creating a legend for a grayscale image
in [Matlab]
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From: Patrick L. on 15 Jul 2010 13:14 Hello, I wanted to know if there's a way to create a legend showing the intensity values of each pixel in an image. What I'm trying to get is something that shows what color (from white to black) corresponds to what pixel value on the image plot (using the imagesc command). For example, white = x, black = y, where x and y are whatever values white and black correspond to in the image.
From: Patrick L. on 15 Jul 2010 13:46 On Jul 15, 10:14 am, "Patrick L." <pll...(a)email.arizona.edu> wrote: > Hello, > > I wanted to know if there's a way to create a legend showing the > intensity values of each pixel in an image. What I'm trying to get is > something that shows what color (from white to black) corresponds to > what pixel value on the image plot (using the imagesc command). > > For example, white = x, black = y, where x and y are whatever values > white and black correspond to in the image. By the way, I *think* that, in my images, -1 corresponds to black, 0 corresponds to gray, and +1 corresponds to white.
From: Steven Lord on 15 Jul 2010 13:59 "Patrick L." <pllull(a)email.arizona.edu> wrote in message news:fd4c87ca-223c-414a-962e-549d6a3244ef(a)k8g2000prh.googlegroups.com... > Hello, > > I wanted to know if there's a way to create a legend showing the > intensity values of each pixel in an image. What I'm trying to get is > something that shows what color (from white to black) corresponds to > what pixel value on the image plot (using the imagesc command). > > For example, white = x, black = y, where x and y are whatever values > white and black correspond to in the image. If you're using a GRAY colormap to display your image, look at the COLORBAR function. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
From: Patrick L. on 15 Jul 2010 14:08 On Jul 15, 10:59 am, "Steven Lord" <sl...(a)mathworks.com> wrote: > "Patrick L." <pll...(a)email.arizona.edu> wrote in message > > news:fd4c87ca-223c-414a-962e-549d6a3244ef(a)k8g2000prh.googlegroups.com... > > > Hello, > > > I wanted to know if there's a way to create a legend showing the > > intensity values of each pixel in an image. What I'm trying to get is > > something that shows what color (from white to black) corresponds to > > what pixel value on the image plot (using the imagesc command). > > > For example, white = x, black = y, where x and y are whatever values > > white and black correspond to in the image. > > If you're using a GRAY colormap to display your image, look at the COLORBAR > function. > > -- > Steve Lord > sl...(a)mathworks.com > comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ > To contact Technical Support use the Contact Us link onhttp://www.mathworks.com I did, and it looks like the one I want to use is colorbar(...,'location'). What parameter is "..."? Is that the name of the image?
From: Steven Lord on 15 Jul 2010 14:31
"Patrick L." <pllull(a)email.arizona.edu> wrote in message news:00d8f5b0-8866-45f9-9f83-d003af8e6bdc(a)y32g2000prc.googlegroups.com... On Jul 15, 10:59 am, "Steven Lord" <sl...(a)mathworks.com> wrote: *snip* > > If you're using a GRAY colormap to display your image, look at the > > COLORBAR > > function. > > > > -- > > Steve Lord > > sl...(a)mathworks.com > > comp.soft-sys.matlab (CSSM) > > FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ > > To contact Technical Support use the Contact Us link > > onhttp://www.mathworks.com > > I did, and it looks like the one I want to use is > colorbar(...,'location'). What parameter is "..."? Is that the name > of the image? That means you can add the 'location' option (with an appropriate value from the table on the reference page for COLORBAR substituted for the literal word 'location', of course) at the end of a usage using one of the other syntaxes listed on that page http://www.mathworks.com/access/helpdesk/help/techdoc/ref/colorbar.html For example, you could say: colorbar('Peer', gca, 'North') % Add the location to the colorbar('Peer', axes_handle) syntax or even just: colorbar('East') % Add the location to the colorbar [no inputs] syntax Similarly, you could put the 'Peer' syntax at the end of the 'location' syntax. colorbar('South', 'Peer', gca) -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com |