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imread corruption
All GIF files are indexed-color images. If you're not reading the colormap, the array you're looking at is the index array. It...

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Simple contrast adjustment
If you're working with uint8, then all the pixel values are within [0 255]. The moment you try to do 0.9/im2(x,y), you end up w...

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Converting multiple lines into separate equations from jpeg?
I've played with Grabit and a few other transcription tools, but the view controls are universally cumbersome and buggy. You co...

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Control the saturation of an image
Let's assume that the goal is as follows. User has three RGB images. From two of the images, the hue and saturation content (r...

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[DISCONTINUED] MATLAB Answers Wish-list #5 (and bug reports)
I've been spending a lot of time browsing old content and making use of the RHS "See Also" related forum links ... and I think t...

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Stretch the middle of image
You could do this literally as the question describes inpict = imread('https://www.mathworks.com/matlabcentral/answers/uploaded...

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How to create a blue color gradient
There are various ways to make a gradient image. I'm going to ignore specific colors, as it should be fairly obvious how to ada...

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creating an image convolution code
Here's a start. % this image is class 'uint8' A = imread('cameraman.tif'); % for the math to work, you need it to be floating...

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Index an array using specific indices
Try % some test vectors x = randi([0 1],1,20) s = randi([1 numel(x)],1,10) % this is the content selected by s x(s) % and ...

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Generating gifs that replay and controlling FPS in MATLAB
I don't have exportgraphics(), so I can't experiment with it, and I'm not sure how you're using it. Off the top of my head, I...

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Wave effect over an image in matlab
Both "effect" and "overlay" are terribly ambiguous. Literally anything that influences an image could be called be an "effect"....

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How to remove image background in Matlab
Here is one simplistic example. % an image A = imread('coins.png'); % basic thresholding to select objects mk = A>100; ...

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How can I convert a svg file to matrix or image in Matlab?
If you have raster images embedded in an SVG file, you may be able to extract them something like this: % filename of svg file ...

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How to put silhouettes together and compare without covering
If you want to put the two source images in a montage, then those should be the ones that you specify in the call to montage(). ...

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How to annotate border around original RGB image
This is actually a good case for imoverlay(). The one thing imoverlay() does is render a binary mask as a colored overlay on an...

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How can I make a filter with the Lorentzian peak to use in imfilter?
I'm not familiar with the distribution or its application here, but here's a start. % parameters gam = 7; fkradius = 20; ...

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How to vectorize ?
You're overwriting the original values, so subsequent tests on the array will produce unexpected matches. Both 0 and 1 are <500...

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Need to count the white dots shown attached. How do I count the white pixel dots
Something like this would be a start I = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1177663/ring.jp...

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Adjust the color bar of all thermal images to be consistent
Unless you have the underlying thermal data, you're going to have to convert the false-color image back into a grayscale thermal...

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Trying to display the segmentation result in the same type as of the original image.
I think you might be asking how to programmatically cast and scale an image to a specific class from any class. If that's the c...

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How to create a Binary image from two columns of raw data
This is similar to the prior answer, but in this case, we need to deal with scaling both x and y data. load matlab.mat outsi...

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I cannot read a PNG figure of the type BasexHeight logical
The error that pic2points() gives you tells you why. Expected input number 1, I, to be one of these types: uint8, uint16, do...

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How to convert multiple images from RGB to Grayscale or Index, Grayscale to RGB or Index and Index to RGB orGrayscale having a single function in use?
Since it's up to me to decide what you want, this must be it. pathlist = {'peppers.png'; 'cameraman.tif'; 'canoe.tif'}; ou...

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Interpolation of missing matrix element
I'm sure there are multiple ways, and interpolation may depend on whether this is 2D data or a bunch of independent rows of data...

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How to convert a gray scale image of thermal camera to colored one?
Working around the fact that the grayscale image is a screenshot, this is basically just a matter of finding the colormap. % ...

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Problem on detect ellipse in the image with many shapes inside
The answers on this post by ImageAnalyst and myself include attempts to identify ellipses. The example I gave seems fine iden...

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use Plot instead of rectangle
Given the same position vector that would be used for rectangle(): % the position parameter used by rectangle() pos = [0 0 20 ...

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For Loop to calculate Convhull & Polyarea
You're trying to find the convex hull of a single point instead of the whole row. CHull = convhull(Xdata(i,:), YData(j,:));

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force colour of pixels with certain values to black when using a colormap with imagesc
If you're using imagesc(), image(), or imshow(), you can use the 'alphadata' property: % we have some data that spans from 0 be...

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I appreciate any advice or method to solve this problem. Preferably if you can guide me with the code to execute. Greetings and thanks
Regarding the RGB/gray issues. The older rgb2gray() tool is oblivious and will simply fail if fed an image that's already singl...

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