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# Roger Breton

Last seen: 3 months ago Active since 2021

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Question

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...

3 months ago | 2 answers | 0

### 2

Question

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 ...

7 months ago | 0 answers | 0

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Question

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...

7 months ago | 1 answer | 0

### 1

Question

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...

8 months ago | 0 answers | 0

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Question

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'...

8 months ago | 0 answers | 0

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Fix out-of-gamut RGB colors
I think I found a solution, alhough it is not elegant... : rawRGB = lab2rgb(Lab,'WhitePoint','d50') TempR = rawRGB(:,1...

8 months 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...

8 months ago | 2 answers | 0

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Why 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...

8 months 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...

8 months ago | 1 answer | 0

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Question

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...

8 months ago | 1 answer | 0

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Searching 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 ...

9 months 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...

9 months ago | 1 answer | 0

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Question

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...

9 months ago | 2 answers | 0

### 2

How 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...

9 months 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...

9 months ago | 0 answers | 0

### 0

How 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 ...

9 months 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...

9 months ago | 6 answers | 0

### 6

Question

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...

9 months ago | 0 answers | 0

### 0

Search 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...

9 months 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...

9 months ago | 1 answer | 0

### 1

Retrieve 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...

9 months 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 ...

9 months ago | 1 answer | 0

### 1

Question

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...

9 months ago | 1 answer | 0

### 1

Question

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...

9 months ago | 1 answer | 0

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Question

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...

10 months ago | 2 answers | 0

### 2

Create (plot) sRGB gamut, using the boundary function?
Here's my code : colorListAB(isoog,:) = 0.5; % Ramène les valeurs à gris row = find( colorListAB(:,1)~= 0.5 ); AA = ...

10 months ago | 0

| accepted

Question

Create (plot) sRGB gamut, using the boundary function?
I would like to show a gamut outline when the student checks off the sRGB checkbox in the figure. On the left, is the result of ...

10 months ago | 3 answers | 0

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Question

Is it possible to improve the performance of my script?
i'm still very new to Matlab and probably go wrong about a lot of things. I needed to add a popupmenu to my figure, to let the s...

10 months ago | 2 answers | 0

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Question

Merge two separate figures into one
In the attached code, I use two separate figure windows. But how could I bring them under "one" figure? I guess I have to use ...

10 months ago | 0 answers | 0