Fade colors of intensity graph

Hi everyone,
I've made a program where I read an 2D-array and plot this array in a intensity graph.
I was wondering if the colors in the graph can fade in each other, preferably in vertical position (columns). The idea is that the numeric data becomes visualized like a DNA profile.
I've added a image of the plotted graph.
Thanks.
Solved!
Go to Solution.
Attachments:
Intensity graph plot major.PNG ‏48 KB
Intensity graph plot minor.PNG ‏35 KB

Without manipulating the array, no it's not possible. I made an idea on the Idea exchange to fix this, I recommend you vote for it. Anti-Alias or Smooth Intensity Plot
Like the idea says, see this post for workarounds.
Tim Elsey
LabVIEW 2010, 2012
Certified LabVIEW Architect

Similar Messages

Changing color ramp Intensity Graph

Using LV8
Set property nodes High and Low colors
and interpolate is set to Yes
but the color ramp still stays blue
not sure what I am doing wrong?

Hi,
High and Low Colours are just colours for values which are out of range! For the ramp itself you have to set Scaling.MarkerValues (don't know the correct English term because I'm using a German LV).
That should help it.
Cheers,
Carsten

Change colors of individual pixels on intensity graph?

I would like to be able to change the color of a set of individual pixels within an intensity graph, to blue for example, while leaving the color table otherwise as is, for example, gray scale. The change to blue would be based on location, not on current gray value. I think I can accomplish this using the mask fx with picture controls, and then convert to intensity graph. Is there a more direct way? A good example to demonstrate this capability would be just using a 'mouse down' event on an intensity graph to change the color at the mouse location. Any thoughts are appreciated.
Sincerely,
Don

Yes, seems to work fine .
If you have LabVIEW 8.0, there is another possibility. There is a new property that allows drawing any pictures or picture elements on your graph area. Of course you could draw individual pixels, but nothing prevents you from e.g. drawing circles, squares, odd shaped areas, arrows or event text. ... Anything you could do with a plain picture indicator. One example that ships with LabVIEW 8.0 is Envelope.vi, see image.
Message Edited by altenbach on 06-12-2006 07:31 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
envelope.png ‏32 KB

BCG Brightness Contrast Gamma - Looking for BCG function returning color table / lookup table coded in pure G and applicable to Intensity Graph or Picture Control

Looking for BCG function returning color table / lookup table coded in
pure G and applicable to 8-bit Intensity Graph or Picture Control. Do
not want to use IMAQ Vision is this particular application. Any
help is appreciated.
Sincerely,
Don

Take a look at this color model software I put together. (Don't concern yourself much with the basic programming at this point.). The color component generator subVI is borrowed from a LabVIEW example.
First look at test_color2.vi. If you adjust the sliders of the various controls, you will see how it works. You can see that for pure B&W images, brightness, contrast, and gamma (which I think I have coded correctly) are all fairly straightforward to modify.
Now look at test_color3.vi. Here we try to adjust BCG for color images using the color model shown here where current color component clusters are carried into the BCG event cases via shift registers. You can see that once color is introduced into the image, it becomes difficult to mix the colorizing with the BCG model. And this is pretty much where I am right now.
Would be interested in comments / suggestions.
Sincerely,
Don
Attachments:
test_color2.llb ‏2251 KB

Setting color table of intensity graph

Hi!
I set the attribute color table of an intensity graph to a rainbow
distribution of the colors, but now I'm not able to change the color
table with the markers in the front panel.
Do you know a solution?
Thanks, Markus

> I set the attribute color table of an intensity graph to a rainbow
> distribution of the colors, but now I'm not able to change the color
> table with the markers in the front panel.
> Do you know a solution?
>
Intensity graphs have two different modes for its color definition.
The first, typical one, is the Color array. It can be set using
either attributes or interactively and lets you define number/color
pairs that create either a smoothly interpolated or a banded color
gradient. The second mode is the color table. This is useful for
bitmaps or for cases where the color table has been custom generated
on the diagram. When using the color table, the Z scale is still
useful for determining which numbers map to the 0-255 range of the
color table. If you set the
Z scale to autoScale, it will find the
min and max of the data and set the Z to show all data mapped through
the color table. If set smaller, some of the values will map to the
first and last out of range colors. If set larger, it will map the
values to a smaller and smaller number of the colors in the color
table.
It sounds like you really want to be using the color array and not
the color table. The intensity graph automatically switches for
you when you write attributes to it, but there is a way to change
it back the the color array using a popup or attribute.
Greg McKaskle

Changing color table for intensity graphs

Hi, I've been working on superimposing intensity graphs and I'm almost getting it, I'm just having trouble with color table, it is suppose to be composed of a 1-D array of 256 colors
I have 2 intensity graphs each with a different color table (256 color - 256 locations in the color table array). I need to "squeeze" both color table into a third color table for the superimposing of the 2 intensity graphs. therefore I figure I would take every other color value from each of the first 2 color tables (so each color table shrinks to 128 color) and add the values to form a 3rd color table so that the bottom will correspond to the first color table and the top will correspond to the 2nd color table.
I can do this manually, but it takes WAY too long, so I've been trying to use some kinda of algorism, but I cannot succeed. Anyone have any suggestions? it seems that color table is an unusual kinda of array
My attempted program is attached.
thanks very much!!
Attachments:
superimposing3.vi ‏111 KB

Brian,
I think this is what you're after (attached). The easiest thing to do is to decimate, then concatenate your original color tables to form your new "squeezed" color table. However, keep in mind that you also have to squeeze, or remap, your underlying data values to correspond with either one half of the color table or the other.
See if what I did makes sense.
Regards,
John
Attachments:
superimposing3_MOD.vi ‏90 KB

Intensity graph and its "interpolate color" option

Dear Devs,
using LV2013.02f, my intensity graph never redraws correctly (it remains black), after I uncheck and check the "interpolate color" option in the right-click menu for the z-axis. Is this reproducible for anybody, please?
Note: There are more situations when the intensity graph remains black after changing some options, but I could not reproduce them systematically. Any ideas what to use instead of it to display 2D arrays of values?
Cheers,

Dear users,
dear GerdW
Related issue:
Intensity graph displays a black z-axis color bar
The issue(s) are connected to the positions of the markers on the color bar. I converted the VI to a 2010version (again, wrapped in a 7-Zip archive), I hope that helps for now.
Now, when I multiply my 2D array with a suitable high- and at the same time low-enough value (multiplier=1E+34) -- 1E+33 is too low, 1E+35 is already too high; then the markers of the color bar are visible suddenly. The "interpolate color" and the blackness of the graph can be now manipulated and adjusted.
So now, I have to remember that the default markers' positions are (0,50,100) and there is no way to change them before I extend the values of my array over this region suitably. Seriously, I went through all the right-click on the z-axis menu items and executed them one-by-one. None of those brought the z-axis color bar or the colors back into the graph again.
Q: How should a novice know about it? Isn't there a "reset all markers, distribute them equally and show all values in the default spectrum color" button somewhere, and did I missed it?!
Cheers,
Attachments:
2013-11-27 0946 buggy intensity graph.7z ‏133 KB

Cannot make vertical axis of intensity graph logarithmic

Has anyone else noticed that that the vertical axis on intensity charts cannot be made logarithmic? Labview gives you the option, but doesn't do anything when you try and check the box. Property nodes don't seem to work either. Tried this in LabVIEW 2011 SP1 and 2013. Am I doing something wrong or is this just a feature that isn't avaiable? I am just wondering if its my install or something that is really an issue.
My application is to plot the power spectrum of sound on a intensity chart to show history of sound recorded by a microphone in real time. Really good to pin point source frequencies of feedback.
Amit

Hi Amit,
This is a documented problem with LabVIEW and it is currently being worked on. Here are a couple other Forums that discuss it and offer workarounds for this issue.
Log scale in an Intensity graph
Possible bug in Intensity Graph while using interpolate colors on a Log scale
Intensity Graph - Mapping Mode
As shown in the 'Possible Bug' link above, a Corrective Action Request has been filed under the number 453407 as soon as a couple of weeks ago. To fully answer your question, it is not your install or anything like that, just an issue NI knows about and will be working on for future releases.
Douglas C.
Applications Engineer
National Instruments

Programming Marker Color in XY Graph

Hello Everyone,
In Igor by Wavemetrics, I can plot XY graph with marker only, the marker color can be tied to the corresponding value in a third data column. In some sense, this is similar to but not quite like an intensity graph. Is it possible to do this in Labview?
I will move my X-Y stages to search for a laser beam in large steps and nail its maximum in finer steps. I would like to plot the trails of my search. I would appreciate if someone already has this kind of search vi.
Thanks in advance.
Fang

Fang,
It is possible to change plot point colors of an XY graph by using a property node run through a case structure. If the results found entering the case structure set it to either true or false, the points can be set to be a certain color. The property you are looking for is Plot.Fill/Point Color. However, this is definitely not the most robust method for doing this, as it involves breaking down your x and y data into individual numbers using a for loop. Also, because the way the XY graph pulls in data, it is essentially impossible to change the color of just one point. In order to do this, you would need to set up a multiplot and have one plot using one color and the other plot using the default color. The plot that utilized your signal color would only plot if certain conditions were met.
So, I would say that using the 3-D graph functions would be a much simpler method, as was suggested by the previous user.
Mr. Moore

Cursor/Window for Zooming in Intensity Graph

Does anybody know how to create a non-rectangular window (any shape
connected by mouse clicks) for zooming (or for data retrieval) if a
particular area in the graph is of interest in a intensity graph?
Wouldn't it be really cool if we can select edges in a graph and
retrieve the information (or data) from the graph?
The other question of mine is: is there a way that when we're using
intensity graphs, we can create the custom menu with right mouse button
click, instead of the standard set of menu items? Any help is greatly
appreciated. Thanks.
Sent via Deja.com http://www.deja.com/
Before you buy.

[email protected] wrote:
> Does anybody know how to create a non-rectangular window (any shape
> connected by mouse clicks) for zooming (or for data retrieval) if a
> particular area in the graph is of interest in a intensity graph?
> Wouldn't it be really cool if we can select edges in a graph and
> retrieve the information (or data) from the graph?
In my pre-NI days, I had a lot of fun trying to coax image-manipulation and
-analysis behavior out of LabVIEW intensity graphs. You can do a fair
amount by making use of cursors and hotkeys and creating pseudo-overlays by
setting image coordinates to certain colors to create visual cues in
response to user inputs.
That being said, I never considered trying to get complex ROI (region of
interest) info from a user wi
th an intensity graph, and I'll bet it's a
pretty tough GUI trick unless you're using IMAQ Vision. If you find
yourself trying to build features like this into your application, or doing
a lot of image manipulation in general, you might save yourself time in the
long run by getting the IMAQ Vision toolkit from NI.
> The other question of mine is: is there a way that when we're using
> intensity graphs, we can create the custom menu with right mouse button
> click, instead of the standard set of menu items? Any help is greatly
> appreciated. Thanks.
I'm not aware of a way to suppress the built-in context-sensitive popup
menus. Sorry!
Regards,
John Lum
National Instruments

MATLAB pcolor and LABVIEW Intensity Graph

Hello all
I have a data matrix which i want to plot using intensity graph of LABVIEW. My problem is that when i plot this matrix using MATLAB pcolor along with "shading interp" command, i got a very fine and smooth coloring graph of this matrix, however, using LABVIEW Intensity graph along with getcolor vi, i was not able to get a smooth coloring graph comparable to MATLAB pcolor. I have tried many setting but results were not satisfactory
Is this due to a limitation of LABVIEW intensity graph or i am missing something? Kindly help me
Best Regards
Asim

Thanks for providing that Asim, unfortunately the VI you provided is unusable as-is. There is a subVI missing, and while not critical, it's difficult to tell how you're setting up the intensity graph without that VI. Additionally, it doesn't appear that there is any graph data included in the VI you provided and a third-party software license would be required to use this VI. Could you upload the data you're handling in a format that works without any external tools?
As for thoughts on the differences in the plots; they are largely similar in appearance, although it does appear that you're using a different color scale in LabVIEW- the majority of your scale is in the blue-green range, rather than continuing linearly through yellow, orange, and red. You're going to lose a lot of visual resolution in the ranges you're highlighting due to this. The plot you're trying to achieve also appears to be interpolated or blurred around the edges of bins, are you actually plotting data between integers on the x-axis, or is this an artefact introduced by the software?
Regards,
Tom L.

Fast intensity graph possible ???

I want to display some images (echographic images for information) in a 1st intensity graph, extract a given column and display it in a 2nd intensity graph.
I have already seen that I have to use the 3Dgraphs. But It seems to be "very slow". Every code line as "m_MyGraph3.Plot3DSimpleSurface(MyMatrixData)" takes between 50 and 60 ms !!!
My images size is approximately 300*300 pixels.
I have also a 2nd question concerning the cast that I have to perform on the raw data acquired by our device in order to display it. For 2D graph with vector of data I use the following "single line" declaration code:
"CNiReal64Vector DataNi(vectorsize, RawDataPointer)"
Can I perform same thing for 3D graph/matrix of data ???
Thank you in advance.

The best way to do this is using the background image of a 2D Scattergraph. Each pixel in the bitmap is a data point. It is really fast. I can do a 3200X1024 bitmap each second without any noticable flicker. Here's some C# code on how to do it.
Note I'm using a gray scale bitmap which is a byte array and a certain PixelFormat. Just use an int array for the bitmap and specify a PixelFormat of color (32bit RGB).
There you have it.
Scott
private void ShowBlockOfData()
int width = _EqualizedData[0].Length;
int height = _EqualizedData.Length;
scatterGraph1.PlotAreaImageAlignment = ImageAlignment.Center;
PrepareBitmap(width, height );
// Now create a dummy bitmap. Use the LockBits method to lock the data in
// memory. This is much faster than SetPixel (I'm not sure you
// can use SetPixel with an Indexed type image. )
Rectangle rec = new Rectangle(0, 0, _Plot.Width, _Plot.Height);
BitmapData bmd = _Plot.LockBits( rec, System.Drawing.Imaging.ImageLockMode.ReadWrite, _Plot.PixelFormat);
unsafe
for(int y=0; y < bmd.Height; y++)
byte* row= (byte*)bmd.Scan0.ToPointer()+(y*bmd.Stride);
for(int x=0; x < bmd.Width; x++ )
row[x] = _EqualizedData[y][x];
_Plot.UnlockBits(bmd);
scatterGraph1.PlotAreaImage = _Plot;
private void PrepareBitmap(int width, int height )
// Create a new bitmap the first time, otherwise use the old one
// to create a new one. Hopefully, this will save us resources.
if ( _Plot == null )
_Plot = new Bitmap(width, height, PixelFormat.Format8bppIndexed );
AssignPalette( );
/// If the palette is null, create it and preserve it internally
/// Set the images palette to our ColorPalette member.
private void AssignPalette()
if ( _palette == null )
// Get the color palette from the image. You can't
// create one from scratch.
_palette = _Plot.Palette;
// Create a grayscale palette by changing this one.
for ( int i = 0; i < _palette.Entries.Length; i++ )
int c = 255-i;
_palette.Entries[i] = Color.FromArgb( c,c,c );
_Plot.Palette = _palette;

Open 32-bit jpeg & convert to intensity graph form (LV8.5 & Vision 8.5)

I will cross-post this in the Machine Vision forum as
well. I have an LLB to open images with IMAQ vision utilities, and
then attempt to convert to intensity graph format. I obtain the color
table of the image from a Vision utility, and subsequently apply to the
intensity graph in hopes of duplicating the vision container contents.
I am unsuccessful in converting 32-bit jpeg and was hoping for some
help. Please let me know if this in fact is even possible to do.
Attached is an example jpeg image file.
Sincerely,
Don
Attachments:
open_image_file_and_convert_to_intensity_graph1.llb ‏207 KB
Photo_111107_0021.jpg ‏240 KB

DonRoth wrote:
Hi George:
Yes - I understand I am getting only one color plane.
With LabVIEW / Vision only, can this jpeg image be displayed in an intensity graph with the proper (original) color information? You say the LabVIEW Read Jpeg File.vi reads this image fine - but how do you display the output of this fx in an intensity graph with the original / proper color information (again using only LabVIEW / Vision, or maybe your toolkit)?
Unless it is an 8 bit color image already you can always down sample it to 8 bit. I think the IMAQ Cast function should do that, otherwise there is for sure some function to change color depth. Colors will of course change slightly as it is very unlikely that a 24bit image especially if it is a photo, has only 256 unique colors used.
Once you converted your IMAQ image into an 8 bit image extracting the bitmap and color dtable is easy and then applying it to an intensity graph of course too. Remains the question why you wouldn't want to use the IMAQ control. If it is about IMAQ license costs then of course you won't be able to use other IMAQ functions either so this advice won't help then.
Rolf Kalbemratter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Intensity graph Z cursor value

Greetings!
I am creating a scanning XY stage program using an intensity graph. I have a cursor to drag around that moves the XY stepper motor stages; zooms, adjusts Z colors & "contrast", etc. I have the data showing up fine.
However I can't figure out how to get the Z value (so I don't have to show the big cursor legend). As you know in the cursor legend as you move a cursor the X Y and Z values are shown.
Can't find a property node for the Z value... This must be simple
Thanks!
Steve
Solved!
Go to Solution.

Unless you use custom axis offsets and increments, it is just the value of the 2D array and the indices of the cursor positions, so index array should get what you want. If you use custom axis scaling, you need to apply the linear transform between cursor x, y values and corresponding array indices.
In a better world, the cursor index property should give both indices of the 2D array and the method would directly work also for cases where the axis scaling is custom. This is the reason for my old idea here, so please vote for it!
LabVIEW Champion . Do more with less code and in less time .

Scaling intensity graph Z-ramp with panel - how?

In LV7.1.1 is there any way to get the color ramp associated with an intensity graph to scale with changes in the VI panel size?
I've tried telling VI to scale the intensity graph indicator with the panel and that didn't work nor did telling it to scale all front-panel objects with the panel. The ramp always retains its original size.

I think you are stuck.
As for most of the controls, there is no way to change the size programmatically.
The only thing you could do as work around is to create a picture control (which size can be changed...) to mimick the graph scale...
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Fade colors of intensity graph

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