# Roger Breton

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**Content Feed**

Question

ColorChecker function does not work?

I am trying to follow the example here: Comparison of Auto White Balance Algorithms - MATLAB & Simulink (mathworks.com) I use ...

24 days ago | 0 answers | 0

### 0

answersNo 'CData' property on bar graph

Does not work for me? I use: data = [1 2 3 4]; figure BarMatrix = [1 2 3 4]; b = bar(BarMatrix,1,'LineStyle','none'); CDa...

1 month ago | 0

Question

Unable to combine plots?

I created a monster of a script which satisfies my research needs for the moments but I am struggling with the subplots. You wi...

8 months ago | 1 answer | 0

### 1

answerQuestion

Can Subplots have own colormaps?

I must be missing something obvious.. but I can get each subplots colorbars to plot with its own colormap? Here is my code: RGB...

8 months ago | 1 answer | 0

### 1

answerQuestion

Extract the "overall colors" of an image to apply another?

I've been meaning to show my students a way to "borrow" the color palette of an image to apply to another? Take the Mona Lisa, ...

8 months ago | 3 answers | 0

### 3

answersQuestion

How to apply color to histograms?

My goal is to analyze RGB images based on Chroma and Hue. For this purpose, I first convert from RGB to CIE Lab, and then from C...

1 year ago | 2 answers | 0

### 2

answersQuestion

Rearrange matrix terms is a challenge

I am not finding exactly the right parameters to rearrange the terms of a matrix? It starts off as an RGB image I later convert ...

2 years ago | 1 answer | 0

### 1

answerQuestion

How do I add "color" to an image?

I'm looking for ways to better understand color mixing theory. Suppose I start of an RGB image? Suppose I want to color the whol...

2 years ago | 1 answer | 0

### 1

answerQuestion

Is it possible to "move" points in 3D?

I have this scatter3 graph, I'm generating from CIE Lab coordinates : Would it be too far-fetch to be able to select any poin...

2 years ago | 1 answer | 0

### 1

answerQuestion

Writing ICC profiles capbilities: can we save modified tags or is it limited to saving header only?

I am thinking about "editing" CMYK output profiles with Matlab. As you know, an output profile starts with a series of 'device'...

2 years ago | 0 answers | 0

### 0

answersFix out-of-gamut RGB colors

I think I found a solution, alhough it is not elegant... : rawRGB = lab2rgb(Lab,'WhitePoint','d50') TempR = rawRGB(:,1...

2 years ago | 0

Question

Fix out-of-gamut RGB colors

I'm going in circle... I have this code, which converts from Lab to RGB : rawRGB = lab2rgb(Lab,'WhitePoint','d50') Trouble i...

2 years ago | 2 answers | 0

### 2

answersWhy are there two different "D50" white points? CIE vs ICC?

Got hold of CIE Publication 15.2:2004 and on Table T3, page 35, D50 is listed as 96.42 100.00 82.51. A fresh search in my stock...

2 years ago | 0

Question

Why are there two different "D50" white points? CIE vs ICC?

I have this code going : wp_D50 = whitepoint('d50') % 0.9642 1.0000 0.8251 wp_D65 = whitepoint('d65') % 0.9505 1.00...

2 years ago | 1 answer | 0

### 1

answerQuestion

How do I get rid of custom data tip?

I have this script which adds a custom data tip to my scatter3 graph : function txt = displayCoordinates(~, info) global...

2 years ago | 1 answer | 0

### 1

answerSearching through table using compound condition

It worked! Sorry for the newbie question. I'm sure there are far more elegant ways to do search a table for information... Will ...

2 years ago | 0

Question

Searching through table using compound condition

I would leke to add a Munsell Notation readout capability to my script. Right now, when the student clicks a point in scatter3 g...

2 years ago | 1 answer | 0

### 1

answerQuestion

Unable to control floating point display?

I have this result : There should be three Lab numbers on the third line but only L and a are showing, with two decimals of p...

2 years ago | 2 answers | 0

### 2

answersHow could I display a "circle at the bottom of the figure? And color it along the way? To show Hue angles?

A final note. This project is far from over. It's getting all kinds of suggestions and usecases (by me). I enclose the code, if...

2 years ago | 0

Question

Trouble with custom data tip function (event)

I am puzzled? I try to have a line drawn during the call to a custom text data tip function. Here is the "normal" response, whe...

2 years ago | 1 answer | 0

### 1

answerHow could I display a "circle at the bottom of the figure? And color it along the way? To show Hue angles?

I integrated the function into my script and it works like a charm. I may reduce the number of points from 1000 to 500 to speed ...

2 years ago | 0

Question

How could I display a "circle at the bottom of the figure? And color it along the way? To show Hue angles?

Crazy idea. I know Matlab is calling OpenGL under the hood but I would not know how to go about adding these two pieces of geome...

2 years ago | 6 answers | 0

### 6

answersQuestion

Drag and Drop support for Axes?

Does Matlab have any support for 'drag and drop'? Here is a screen capture of my current 'imaging' application : As you can s...

2 years ago | 1 answer | 0

### 1

answerSearch 3D RGB array for the closest match?

I think I found a solution (I'm sure there are other approaches, surely more efficient, but here goes). It involves using DeltaE...

2 years ago | 0

| accepted

Question

Search 3D RGB array for the closest match?

In my humble script, I managed to capture the 3D location on a scatter3 graph (see my previous question) out of a pushbutton uic...

2 years ago | 1 answer | 0

### 1

answerRetrieve 3D location from clicked pixel / datatip position

Not a "perfect" answer but I think it's 'workable'. First, I added a pusbutton to the figure. Then I use this code, to obtain t...

2 years ago | 0

| accepted

Question

Retrieve 3D location from clicked pixel / datatip position

I attached a copy of my code (I did not includes the images). My question is how would I retrieve the CIE Lab color coordinates ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Stubborn annotation? Cannot be found by a search? Even though it exists...

I'm using a 'line' annotation to show a selected pixel color in my script. I programmatically create the annotation using this c...

2 years ago | 1 answer | 0

### 1

answerQuestion

setappdata, where to verify?

I'm slowly progressing on my way to Matlab "nirvana"... How would I go about checking whether an element has indeed been added...

2 years ago | 1 answer | 0

### 1

answerQuestion

getappdata / setappdata does not work for me?

I am trying to improve my code by adopting 'better' programming practices. I want to start using into the setappdata functions a...

2 years ago | 2 answers | 0