**RGB to HSV**I know there is the function which converses an image from RGB to HSV
color space is rgb2hsv. But is there any function which convert only
one value RGB to HSV?
Thang Nguyen.
In article <ef1b3bc.-1@webx.raydaftYaTP>,
"Thang Nguyen" <airthang@gmail.com> wrote:
> I know there is the function which converses an image from RGB to HSV
> color space is rgb2hsv. But is there any function which convert only
> one value RGB to HSV?
The same function. Think of it as an image with
only one pixel. A very tiny image.
HTH,
John D'Errico
--
The best material model...

**RGB transform**Hi all ,
I want to extact the 3 components R,G,B of an image and convert them in a
space of two dimension trough two formulas like as :
a=f(R,G,B)
b=g(R,G,B)
Where f and g are two simple rational functions .
I have used IMAQ ColorImageToArray connected with IMAQ IntegerToColorValue ,
is it correct ?
How do I realize this transformations ?
(I think I have to use a for loop to scan image pixels ...)
Bonjour,
comment �muler la fonction RTSI (synchronisation de l'acquisition entre les
cartes PCI 4472 et 4474) avec DAQmx version 7.2 ?
A l'�x�cution de l'exemple Multi-Device Synch...

**RGB vs HSV**Most graphics APIs seem to want colours specified in RGB space. But RGB is a
poor choice for doing colour manipulations; for example, if you want a
lighter or darker version of a given colour, naive manipulations directly on
the RGB components are likely to lead to hue shifts.
A better space to work in is HSV. This way, you can, say, tweak the
saturation or brightness, and leave the hue unchanged. It is also easier to
predict what colour you are likely to get from a given set of HSV values.
Even if your graphics API doesn’t support it directly, you can still convert
to HSV, do your man...

**transformation between xyY and RGB**Dear all,
I have some questions about the use of icc Matlab commands of Image
Processing Toolbox.
I need to convert xyY coordinates to RGB coordinates.
How can I specify the Y (in cd/m2 or normalized between 0 and 1)?
I obtained incorrect results, so I tried the invers process:
transformation from RGB to xyY but I find Y always smaller than one.
Is it normalized? If yes, how can obtain Y in cd/m2? and what's the
value I have to moltiply for the de-normalization?
Any help will be appreciated!!
Many thanks in advance!
Roberta Fagioli
University of Pavia
...

**RGB -> HSV**Hi,
I had to build a function that converts RGB to HSV. This is what I've
done so far but I am not sure if it is correct or not. Plus, I am
stuck with Hue conversion.. can someone help me to verify if I am on
the right track or at least give a hint. I've tried to verify it using
the built in function rgb2hsv in matlab, but when I plot it
separately, there was only a blue image appeared. To verify it, this i
did H=rgb2hsv(I); image(H(:,:,1)); image(H(:,:,2)) etc2..
%
---------------------------------------------------------------------------------------------------------
% This funct...

**transforming images rgb to cmyk**I want to know how can i transform rgb images to cmyk without loosing
original colors in te printing process
thanks
In article <42908a9b$0$12857$a729d347@news.telepac.pt>,
"indide_designs" <rica_rui@sapo.pt> wrote:
> I want to know how can i transform rgb images to cmyk without loosing
> original colors in te printing process
Impossible. The laws of physics forbid it. Certain RGB colors can not be
reproduced in the CMYK color space, period.
Sorry...
--
Art, photography, shareware, polyamory, literature, kink:
all at http://www.xeromag.com/franklin.html
...

**RGB to L*A*B transformations**Hi,
i am new to matlab. So i have very basic question:
When i was going through tutorials i found this script:
% Example of color based image segmentation
close all
% read image
RGB = imread('greens.jpg');
nColors = 3;
% select areas
for count = 1:nColors
sample_regions(:,:,count) = roipoly(RGB);
end
% do l*a*b transformation to the original image
cform = makecform('srgb2lab');%creates color transformation structure
lab_RGB = applycform(RGB,cform);%apply created transformation to image
a = lab_RGB(:,:,2);
b = lab_RGB(:,:,3);
color_markers = repmat(0, [nColors, 2]);
for c...

**hsv histogram of a rgb image**Hi, i need to obtain a 8*8*4 histogram in HSV color space. i was wondering if anybody could tell me if the below code is correct:
function hsvColorHistogram = hsvHistogram(image)
[rows, cols, ~] = size(image);
image = rgb2hsv(image);
% split image into h, s & v planes
h = image(:, :, 1);
s = image(:, :, 2);
v = image(:, :, 3);
% quantize each h,s,v to 8x2x2(8x8x4)
% Specify the number of quantization levels.
numberOfLevelsForH = 8;
numberOfLevelsForS = 8;
numberOfLevelsForV = 4;
% Find the max.
maxValueForH = max(h(:));
maxValueForS = max(s(:));
maxValueForV = max(v...

**Plot Color RGB HSV**Dear All,
i want create a 2D plot (x,y) where plot line has particular
RGB and HSV value.
For example:
R:0
G:128
B:255
H:140
S:240
V:120
Can you help me? thanks
Francesco
In article <g1n5vi$bmi$1@fred.mathworks.com>,
Frank Pezzulo <john.doe.nospam@mathworks.com> wrote:
>i want create a 2D plot (x,y) where plot line has particular
>RGB and HSV value.
>For example:
>
>R:0
>G:128
>B:255
>H:140
>S:240
>V:120
>Can you help me? thanks
set(gca,'ColorOrder',[[0 128 255]./255;hsv2rgb([140 240 120]./255)...

**rgb to hsv in simulink model**hello sir,
objective:
In matlab simulink model, i need to convert the format of multimedia file RGB to HSV model and propagate it to channel , background estimation and so on..........
problem:
in background estimation , the sampling box is not accepting the dimension of input signal.
in background estimation. the reshape box too not accepting the input signal.
it shows the error :
the signal input size is 57000x1.
pls help me sir,
...

**Image processing RGB to HSV**Hi !
I faced some problems in converting the RGB images in database to RSV. I have to convert all the images in the database to HSV and extract the feature vectors. I don't know how to convert all the images in the database to HSV. Can anyone help me?
here is my code for RGB images 2D histogram:
count=0;
distance=0;
for i=1:90 % first 90 images in database (which are categorized as beach)
for j=91:810 % other images in database
h1 = database{i}.Hist;
h2 = database{j}.Hist;
count = count+1;
distances(count) = sqrt(sum(sum((h1-h2).^2))); % get euclidian di...

**Image Fusion**
This is something one can do very easily in ENVI/IDL but the image
sharpening->hsv tool in ENVI does not allow one to control saturation
in the fused image. So I am giving a try in MATLAB...
This was supposed to be easy...
I load a low-resolution (LR) color RGB image and a high-resolution
(HR) gray-scale image (a radar image, actually) and then:
1 - transform the LR image from RGB to HSV color space;
2 - substitute V component by the HR image;
3 - set the S component to some constant percentage (optional step);
and
3 - convert HSV transformed image back to RGB color space.
I did all th...

**transformation between xyY and RGB #2**Dear all,
I have some questions about the use of icc Matlab commands of Image
Processing Toolbox.
I need to convert xyY coordinates to RGB coordinates.
How can I specify the Y (in cd/m2 or normalized between 0 and 1)?
I obtained incorrect results, so I tried the invers process:
transformation from RGB to xyY but I find Y always smaller than one.
Is it normalized? If yes, how can obtain Y in cd/m2? and what's the
value I have to moltiply for the de-normalization?
Any help will be appreciated!!
Many thanks in advance!
Roberta Fagioli
University of Pavia
...

**RGB to HSV image conversion**Here is the program to convert RGB image to HSV
function [hue,sat,val] = fcn(R,G,B)
MAX3=max(R,G);
MAX3=max(MAX3,B);
MIN3=min(G,B);
MIN3=min(MIN3,R);
val = MAX3;
sat = (MAX3 - MIN3)/MAX3;
a=isequal(MAX3,R);
if (a == 1)
hue = 0 + 43*(G - B)/(MAX3 - MIN3);
end
b=isequal(MAX3,G);
if (b == 1)
hue = 85 + 43*(B - R)/(MAX3 - MIN3);
end
c=isequal(MAX3,G);
if (c == 1)
hue = 171 + 43*(R - G)/(MAX3 - MIN3);
end
but the error is that i'm using a input image 384x512(R,G,B) matrix but 'sat' and 'hue' are of 384x384..
help me plz..
On 2/27/2012 7:00 AM...

**HSV<->RGB**Hi there, I'm wondering how the HSV<->RGB conversion works in the color
dialog of windows, since, as far as I've seen for all conservion algorithms,
RGB(255,0,0) is HSV(0,255,255), but for Windows, RGB(255,0,0) is
HSV(0,240,120). For Windows, only pure white has a miximum lightness, but
for algorithms I've seen so far, a color with maximum lightness is reached
for a lot a color (such as pure red, yellow, in fact for all pure colors).
So where's the thuth and how does the windows color conversion work ?
Thank you for your help.
This is probably totally irrelevant, but...

**how to convert rgb colorspace to hsv colorspace**I am developing project in java in which i have to convert RGB imageto HSV image so please send me the code or algorithm for that "manisha chawla" <chawla.manu10@gmail.com> wrote in message
news:1175598407.449222.29940@b75g2000hsg.googlegroups.com...
>I am developing project in java in which i have to convert RGB image
> to HSV image so please send me the code or algorithm for that
When I google for "hsv rgb" the first hit is:
Color Conversion Algorithms
RGB to HSV & HSV to RGB. The Hue/Saturation/Value model was created by A.
R. Smith in 1978. It is...

**HSV vs. RGB for sorting colors**I need to basically sort an indicating dye from a background, with the dye being a different color. I noticed there were a few ways to sort an image by color, one being RGB which I am familiar with. However, when researching appropriate techniques I found out about HSV.
The link below is a sample program for sorting color based on the HSV value.
http://www.mathworks.com/matlabcentral/fileexchange/28512-simple-color-detection-by-hue/content/SimpleColorDetectionByHue.m
I was wondering if there was a simple answer for the advantages of HSV vs. RGB. Is there one situation that would lend itsel...

**colorsys: RGB to YIQ transform matrix**In colorsys.rgb_to_yiq, the matrix of the linear transformation used is
.30 .59 .11
.60 -.28 -.32
.21 -.52 .31
The places I checked on the Internet use
.299 .587 .114
.596 -.275 -.321
.2.1 -.523 .311
Why does colorsys use a 2 decimal place wersion of the array? What is
the actual definition of the RGB to YIQ transform?
Edward C. Jones wrote:
> In colorsys.rgb_to_yiq, the matrix of the linear transformation used is
>
> .30 .59 .11
> .60 -.28 -.32
> .21 -.52 .31
>
> The places I checked on the Internet use
>
>...

**RGB <-> HSV functions**This must have been asked 1000 times before, but where can I find
algorithms/functions to convert RGB-> HSV and HSV->RGB.
The best I can google is:
http://www.mtholyoke.edu/acad/compsc/Honors/Lilla-Zollei/chap6.html
http://www.codeproject.com/bitmap/calchsi.asp
gtoomey
"Gregory Toomey" <nospam@bigpond.com> wrote in message
news:2ro66lF1d92lcU1@uni-berlin.de...
> This must have been asked 1000 times before, but where can I find
> algorithms/functions to convert RGB-> HSV and HSV->RGB.
>
> The best I can google is:
> http://www.mtholyoke.edu/acad/...

**wxColour HSV HLS RGB Conversions**--0-1356068209-1142362136=:81620
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
Hi
I'm porting a Win32 app to wx and I have used ::ColorHLStoRGB of shlwapi.lib.
the wxImage have a similar funcion called HSVtoRGB.
Why do not enhance the wxColour class,adding funcions of Color Space convertions,and helpers (eg. double Hue(),double Saturation()...) ??
(sing the shlapi or even using the color space formulas)
references:
http://windowssdk.msdn.microsoft.com/library/default.asp?url=/library/en-us/ShellCC/platform/shell/reference/shlwapi/gdi/palette....

**Intel IPP RGB->YCbCr_JPEG transforms**Hi,
Has anyone ever used these? There are 2:
1) ippiYCbCrToRGB_JPEG_8u_P3C3R
2) ippiYCbCrToRGB_JPEG_8u_P3R
(See below for details)
transform 1 is planar-planar 8bpp transform
transform 2 is planar-interleaved transform
I understand why this transform is lossy however I am finding that if I
compress the same image with both transforms, I do not get the same
image back.
To clarify the input is a planar image, and i interleave the output
from transform 1 and do a compare with the output from transform 2.
You would have thought they would be identical right?
Not only that but these jpeg fu...

**Intel IPP RGB->YCbCr_JPEG transforms**Hi,
(cross posted from comp.sys.compression)
Has anyone ever used these? There are 2:
1) ippiYCbCrToRGB_JPEG_8u_P3C3R
2) ippiYCbCrToRGB_JPEG_8u_P3R
(See below for details)
transform 1 is planar-planar 8bpp transform
transform 2 is planar-interleaved transform
I understand why this transform is lossy however I am finding that if I
compress the same image with both transforms, I do not get the same
image back.
To clarify the input is a planar image, and i interleave the output
from transform 1 and do a compare with the output from transform 2.
You would have thought they would be identica...

**High quality RGB <-> HSV conversion**I need to perform a high quality conversion between RGB and HSV (or
HSB, HSL, HLS, or whatever you heard first). So far I've tried 3
algorithms, and they were all very poor. How do the likes of Paint
Shop Pro and Photo Shop achieve this?
What I need to do is adjust the HSV of a colour delivered in RGB. I
assumed that the only way to do that is convert to HSV and back again.
So if there's an algorithm that can change RGB w/out converting to HSV
I'd love to hear it.
Here's what I tried and *some* of what's wrong with them:
Foley/Van Dam: choppy. Converting a photograp...

**How to transform a rgb image on a eigenface image in command window?**I want to use a function in matlab to transform a rgb image to an eigenface image.
Question 1: What type of image is an eigenface image?
Question2: What function should I use for the conversion rgb image to eigenface image?
In the link above the documentation presents the way that should look the eigenface images:
http://www.pages.drexel.edu/~sis26/Eigenface%20Tutorial.htm
What I study now I see that I must apply neuronal networks toolbox.
I type in Command Window :
>>help nnet % to see the functions leasted there but I don't know what function
in that list can be applied to ...