IMAQ Write JPEG File doesn't save color
Hi, I'm writing an 8 bit image to file. If I save it as bmp (using "IMAQ Write BMP.vi") File then color data is saved. If I save it as Jpeg using "IMAQ Write JPEG File", then I only get grayscale. I have attached a demonstration. There appears to be a bug in the IMAQ vi.
Attachments:
ni_demo.llb 203 KB
At IMAQ create.vi you need to specify RGB image type. You are actually using 8 bit, that is a grayscale type.
Attachments:
ni_demo.llb 203 KB
Similar Messages
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Hi,
I am trying to save the image file captured by a camera (.tiff) to JPEG file, but it came up with an error. Can anyone tell me how to fix this issue?
The sample VI and the TIFF image file are attached. Thanks a lot.
Jane
Solved!
Go to Solution.
Attachments:
SaveJPEG.vi 47 KB
SaveJPEG.vi 47 KB
IR_Image.zip 443 KBThe VI "IMAQ Dispose" is not used immediately after creating the image with the VI "IMAQ Create" and is closing a session you will process later, you must also change the location at which to save the image, because to the location "C: \" and "C: \ temp \" often generates problems with operating system permissions.
Regards.
Jonathan Cruz
CHALLENGER
K U D O S __ B I E N V E N I D O S -
Write JPEG file error on Compact FieldPoint
Hello!
I'm using Compact FieldPoint 2120 and LabVIEW 8.2. I'm trying to capture an image of a front panel and to save it into Compact FieldPoint using the "Write JPEG file". Unfortunately, it gives the error 1.
I indicated c:\<jpeg_file_name.jpg> for the path.
I switched the target to "My computer" and the code works correctly.
Is that a problem of the path or VI Write JPEG file cannot be impemented on Real-Time target, such as Compact FieldPoint?
Thank you!Well, that's true that Real-Time does not support Write JPEG file (this is the first problem). I'm using now Write BMP file insteed. The second problem, verified also in my practice, is that the Front Panel does not exist too on Compact FieldPoint.
My aim is to develop web-interface to deal with the Compact FieldPoint from any computer. That is true that it has its own built-in Web-Server, but it doesn't have a script-executive environement. My idea was to create a custom "web" server running in parallel with the principal Web-Server to execute VI scripts.
For that purpose I used TCP Listen -> TCP Read -> TCP Write runing on the port 82. I can send from any browser the request http://<IP address>/<script.vi>?<params> and my custom server parses the request and executes the <script.vi>. Then to avoid the problems with HTTP protocol I write the redirecting request to the port 82 like <meta http-equiv="Refresh" content="0; URL=<result_page.html">. So, It works.
The result_page.html must represent the acquired data from the Compact FieldPoint channels. So, I execute a requested script to show the specified data into Graph waveform and then to take a snapshot and to save to the Compact FieldPoint. Then the result_page.html contains the link to the saved snapshot picture.
Once executing the requested VI script, the Invoke Node gives the error 1003 stating that "the VI is broken etc...". I think that is because of the script attempts to take a snapshot of a panel which doesn't exist...
Maybe somebody has an idea how to view the acquired data in browser ?
Message Edited by Mons on 07-10-2008 06:06 AM -
Replacing a file using 'Write JPEG File(6_1).vi'
when windows prompts for the file name to save the jpg, if I type in or choose an already existing file name, the jpg image fails to change. It works fine if I enter a unique file name. Any help?
I've tried to duplicate your error on both win 98 and xp, but cannot. I attached my test program along w/ a copy of Write JPEG just in case yours has been altered.
Perhaps you could post your own problematic vi.
2006 Ultimate LabVIEW G-eek.
Attachments:
JPEG_test.vi 49 KB
Write_JPEG_File_copy.vi 91 KB -
I have used the write jpeg file from intensity but image colours are different
Here are the relevent files for my program.
Insert these values
x1=218
x2=368
y1=45
y2=45
r=39 in order to run adn crop the pictures
I hope someone can help
Attachments:
218_368_45_39.jpg 23 KB
2ColourProgram.llb 355 KBHi,
I'd suggest you to use PNG format to save the images of your intensity graphs. You get sharper images than JPEG format.
I made some modification to your program to save PNG files, anyway you can try to save in JPEG and see the difference.
Alberto
P.S. I removed the delay of 100ms from the final Equation with kl fator.vi, the speed is much increased.
Attachments:
2ColourProgram.zip 176 KB -
Memory leak in IMAQ Write PNG File
Hi,
I have a labview program that I'm using to do Speckle Patter Interferometry - it takes an image, takes a second image after some time, then subtracts the original image from the first and saves the subtraction. The process reveals fringes on an object deformed on wavelength scales.
The problem currently is that the program seems to have a memory leak. When I run the program, the amount of memory being used (according to Windows Task Manager) just keeps going up and up then after about 20 minutes, it crashes with the error:
Error 1074396159
Not enough memory for required operation
The error is normally when the file tries to write the png file - though that is the part of the program that takes the most time so it could just be coincidence that it happens at this point in the loop.
I've tried using the labview profiler (output attached), but can't see a particular VI that is using an abhorrent amount of memory.
I'm fairly stuck for ideas - I've attached a library with the VI and its sub VIs - if anyone would be so kind as to give me a hand I'd be very much appreciative. I realise that my code is quiet messy - this is my first attempt at labview (albeit quite a long way into my first attempt) so any suggestions would be much appreciated also.
Thanks
Sam
Attachments:
ESPI.llb 556 KB
memory_profile.txt 237 KBHi Sam,
I'm glad to hear that you managed to fix the problem in your code. I have had a look at the code you posted and I have a few suggestions on how you can improve it.
In your code you haven't included the error clusters from the VIs. Most sub VI functions included in LabVIEW will have an Error In and Error Out port that will transfer any error information through the VI. If an error does occur in the code, the error will be passed through the rest of the VI. If a sub VI or function receives an error at its error in port the VI will not execute and the error will pass through until it reaches the end of the VI. At the end of a the VI there needs to be an Error Handler function to display the error information. As error information flows through the VI the same as the data, using error clusters is a good way to determine the flow of data through a VI. This is a good way to determine the data flow through the VI as opposed to Sequence Structures which should be used in moderation.
I have taken a segment of you code and made some minor modifications to demonstrate how error clusters can be used (see screenshot below).
Error clusters can be implemented into any logic for the stop condition of a while loop. The Unbundle by Name using the Status option can be used in conjunction with the error cluster to produce a boolean output depending on if an error has occurred. If an error does occur, the function will produce a true and if an error does not occur it will produce a false. The error cluster can also be expanded by hovering the mouse over the top or bottom of the function and dragging the grey box up or down. This is useful for when you want to produce multiple outputs from the same data, such as the histogram data in your VI.
Another thing I noticed in you code was some redundant logic. You had set the Stop button default on your front panel to true, which meant that an inverter had to be used to stop the first while loop and the stop condition in the last while loop had been changed to Continue if True. If you had kept the stop button default to False and the stop condition of the last while loop to Stop if True, the inverter on the first while loop would not be needed. This however is only a small issue but its something you could keep in mind when writing other code.
Hopefully these suggestions will help you to further develop you LabVIEW code. I understand that implementing these suggestions into you current code could be an issue due to the size of it, but they are good features to consider when developing any code in the future.
If there is anything you are unsure of please do not hesitate to post any questions. I will be more than happy to assist you.
Kind Regards
Jason W.
Applications Engineer
National Instruments UK & Ireland -
How can I prevent my "Write JPEG File" vi from printing on my default printer?
I use this VI to create a JPEG image of my front panel, but it always both creates the JPEG image like it's supposed to AND it prints to my default printer. Has anyone else had this problem? Is there a workaround? Is there another way to create JPEGs? I've replaced it with the "Write to BMP File" vi, and I'm getting the same results.
Solved!
Go to Solution.Never seen that before - posting code that shows this behaviour would be handy.
My guess would be that you have an errant VI.Print.Panel to Printer method hanging around somewhere in your code.
CLD -
Write to file taking too long.
Hi,
I have a peculiar problem . I have used state machine architecture to build my code. In one particular state i write the data accquired and strore the wave form graphs as jpegs on the disk.
File open and close happen only once outside the while loop. I am using "Write FIle" vi to write the data. Data is first bundled into a cluster and then writte. I use "Write JPEG FIle" to store graphs as JPEGS.
When i create the executable and run, the program stops here in this state for an indefinite amount of time. (sometimes 60 secs, 80 secs)
and then continues. Multiple tests have confirem that the problem is either due to file write or JPEG write.
Can anyone please tell me the cause of error
what happens to all the pop ups (errors thrown by labview when running the program) when the program is converted ino an executable?
Rgds
Prithvi.Hi prithvi,
I suppose you work on a windows system. Windows may buffer the contents of a folder to allow faster directory queries. So sometimes your access is granted very fast,
sometimes not (= getting new directory listing)...
It's always a good idea to have a well structured folder tree for your files. Why don't you use subfolders for each measurement? Why don't you use a subfolder for each new day/hour, depending of the number of measurements done it that time?
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
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Write text to picture and save it
Hi!
What I want to do is to write a text (e.g. a date) to a picture. It should be displayed in picture control and saved to jpeg-file.
Aquiring the image and saving it works well. But how do I write text to it??? I do not have the Vision-toolkit. Is there any other way??
Thanks
StarterHi,
Saving the contents on the picture control to a jpg can be done using the Invoke node "Get Image" method. This will return the parameters required for the "Write JPEG File.vi".
I have attached a VI to demonstrate this....
P.S Its another one of those LabVIEW things that is straightforward, but is mind boggling to figure out yourself. =)
Charles ElBayeh
Applications Engineer
Madry Technologies, NI Alliance Member
www.madry.com.au
Attachments:
Text_on_JPG.vi 45 KB -
I am acquiring cosine wave and a pulse wave as input and I want to store their peak to peak values into an excel file. "Write to File" is not working for it. Is there any other vi which can be used for data logging?
Thank you for your help.Hi Ssheoran,
Can you provide more detail when you say that the Write to File VI doesn't work? Is there an error given? Or can you just not find the file on your computer? Keep in mind using this file in a Real-Time VI on the myRIO will save files on the myRIO. You will then have to transfer to your PC. Please view the following video as a guide for saving files and transferring them to your computer: (http://www.youtube.com/watch?v=BuREWnD6Eno). Hope this helps.
Best Regards,
Roel F.
Applications Engineer
National Instruments -
How do you save your artwork in Photoshop CC 2014 as an PNG or JPEG file when it doesn't give the option?
Thanks for your time and help in advance.Thanks for replying. I actually got it to work. I had my work set to 32 Bits/Channel in stead of 16 or 8. Once I changed it to 16bit/Channel, it gave me the option to save as either file. Thanks again.
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How to convert a jpeg file into a 1-bit bmp file (2 colors image)
Hi. I�m having serious problems to convert a jpeg file into a 1-bit bmp file (2 colors image).
I�m using FileSaver.saveAsBmp(String t) but what i get is a bmp image, but with 16M colors, but what i want is a 2 colors bmp file. A black and white image.
Does anybody know how to do this? I�m really getting crazy with ths problem.
Thanks in advanceHi opalo,
this code may help you...
import java.awt.*;
import java.io.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
class Write1 extends Component {
//--- Private constants
private final static int BITMAPFILEHEADER_SIZE = 14;
private final static int BITMAPINFOHEADER_SIZE = 40;
//--- Private variable declaration
//--- Bitmap file header
private byte bitmapFileHeader [] = new byte [14];
private byte bfType [] = {'B', 'M'};
private int bfSize = 0;
private int bfReserved1 = 0;
private int bfReserved2 = 0;
private int bfOffBits = BITMAPFILEHEADER_SIZE + BITMAPINFOHEADER_SIZE;
//--- Bitmap info header
private byte bitmapInfoHeader [] = new byte [40];
private int biSize = BITMAPINFOHEADER_SIZE;
private int biWidth = 50;
private int biHeight = 70;
private int biPlanes = 1;
//private int biBitCount = 24;
private int biBitCount = 1;
private int biCompression = 0;
private int biSizeImage = 0x030000;
private int biXPelsPerMeter = 0x0;
private int biYPelsPerMeter = 0x0;
private int biClrUsed = 0;
private int biClrImportant = 0;
//--- Bitmap raw data
private int bitmap [];
//--- File section
private FileOutputStream fo;
//--- Default constructor
public Write1() {
public void saveBitmap (String parFilename, Image parImage, int
parWidth, int parHeight) {
try {
fo = new FileOutputStream (parFilename);
save (parImage, parWidth, parHeight);
fo.close ();
catch (Exception saveEx) {
saveEx.printStackTrace ();
* The saveMethod is the main method of the process. This method
* will call the convertImage method to convert the memory image to
* a byte array; method writeBitmapFileHeader creates and writes
* the bitmap file header; writeBitmapInfoHeader creates the
* information header; and writeBitmap writes the image.
private void save (Image parImage, int parWidth, int parHeight) {
try {
convertImage (parImage, parWidth, parHeight);
writeBitmapFileHeader ();
writeBitmapInfoHeader ();
writeBitmap ();
catch (Exception saveEx) {
saveEx.printStackTrace ();
* convertImage converts the memory image to the bitmap format (BRG).
* It also computes some information for the bitmap info header.
private boolean convertImage (Image parImage, int parWidth, int parHeight) {
int pad;
bitmap = new int [parWidth * parHeight];
PixelGrabber pg = new PixelGrabber (parImage, 0, 0, parWidth, parHeight,
bitmap, 0, parWidth);
try {
pg.grabPixels ();
catch (InterruptedException e) {
e.printStackTrace ();
return (false);
pad = (4 - ((parWidth * 3) % 4)) * parHeight;
biSizeImage = ((parWidth * parHeight) * 3) + pad;
bfSize = biSizeImage + BITMAPFILEHEADER_SIZE +
BITMAPINFOHEADER_SIZE;
biWidth = parWidth;
biHeight = parHeight;
return (true);
* writeBitmap converts the image returned from the pixel grabber to
* the format required. Remember: scan lines are inverted in
* a bitmap file!
* Each scan line must be padded to an even 4-byte boundary.
private void writeBitmap () {
int size;
int value;
int j;
int i;
int rowCount;
int rowIndex;
int lastRowIndex;
int pad;
int padCount;
byte rgb [] = new byte [3];
size = (biWidth * biHeight) - 1;
pad = 4 - ((biWidth * 3) % 4);
if (pad == 4) // <==== Bug correction
pad = 0; // <==== Bug correction
rowCount = 1;
padCount = 0;
rowIndex = size - biWidth;
lastRowIndex = rowIndex;
try {
for (j = 0; j < size; j++) {
value = bitmap [rowIndex];
rgb [0] = (byte) (value & 0xFF);
rgb [1] = (byte) ((value >> 8) & 0xFF);
rgb [2] = (byte) ((value >> 16) & 0xFF);
fo.write (rgb);
if (rowCount == biWidth) {
padCount += pad;
for (i = 1; i <= pad; i++) {
fo.write (0x00);
int b = 1200;
fo.write(b);
rowCount = 1;
rowIndex = lastRowIndex - biWidth;
lastRowIndex = rowIndex;
else
rowCount++;
rowIndex++;
//--- Update the size of the file
bfSize += padCount - pad;
biSizeImage += padCount - pad;
catch (Exception wb) {
wb.printStackTrace ();
* writeBitmapFileHeader writes the bitmap file header to the file.
private void writeBitmapFileHeader () {
try {
fo.write (bfType);
fo.write (intToDWord (bfSize));
fo.write (intToWord (bfReserved1));
fo.write (intToWord (bfReserved2));
fo.write (intToDWord (bfOffBits));
catch (Exception wbfh) {
wbfh.printStackTrace ();
* writeBitmapInfoHeader writes the bitmap information header
* to the file.
private void writeBitmapInfoHeader () {
try {
fo.write (intToDWord (biSize));
fo.write (intToDWord (biWidth));
fo.write (intToDWord (biHeight));
fo.write (intToWord (biPlanes));
fo.write (intToWord (biBitCount));
fo.write (intToDWord (biCompression));
fo.write (intToDWord (biSizeImage));
fo.write (intToDWord (biXPelsPerMeter));
fo.write (intToDWord (biYPelsPerMeter));
fo.write (intToDWord (biClrUsed));
fo.write (intToDWord (biClrImportant));
// DataOutputStream temp = new DataOutputStream(fo);
// int m = 32;
// temp.writeInt(m);
catch (Exception wbih) {
wbih.printStackTrace ();
* intToWord converts an int to a word, where the return
* value is stored in a 2-byte array.
private byte [] intToWord (int parValue) {
byte retValue [] = new byte [2];
retValue [0] = (byte) (parValue & 0x00FF);
retValue [1] = (byte) ((parValue >> 8) & 0x00FF);
return (retValue);
* intToDWord converts an int to a double word, where the return
* value is stored in a 4-byte array.
private byte [] intToDWord (int parValue) {
byte retValue [] = new byte [4];
retValue [0] = (byte) (parValue & 0x00FF);
retValue [1] = (byte) ((parValue >> 8) & 0x000000FF);
retValue [2] = (byte) ((parValue >> 16) & 0x000000FF);
retValue [3] = (byte) ((parValue >> 24) & 0x000000FF);
return (retValue);
class Writebmp
public static void main(String args[])
//Image img = Toolkit.getDefaultToolkit().getImage("jatin.bmp");
try
File filename = new File("jatin_test.bmp");
BufferedImage image = ImageIO.read(filename);
Graphics graphics = image.getGraphics();
graphics.drawString("उजगर",10,30);
Write1 w = new Write1();
Image img = Toolkit.getDefaultToolkit().getImage("jatin_test.bmp");
w.saveBitmap("jatin_test.bmp",img,200,200);
catch (IOException e)
System.err.println ("Unable to write to file");
System.exit(-1);
} -
How to save JPEG files in PSE5.0 ?
OK. newby Q again. how the heck does one know what to choose when it comes to saving an image as a JPEG? the following three boxes pop up:
IMAGE OPTIONS:
QUALITY>
FORMAT OPTIONS:
BASELINE>
PROGRESSIVE>
SIZE:
up to 2 MBps?Generally, if you're going to archive your photos as Jpegs, you would want to save them in as high a quality as possible. This would be with the slider all the way to the right or number "12".
Usually "Baseline standard" would be the way to go. This writes the photo in one pass to the screen.
"Progressive" writes the photo in 3 passes across the screen, and is usually used for uploading and viewing large files within a web page.
The "size" dialog box you're referring to, gives you the approximate time (in seconds) required to upload the photo with 56.6bps internet. (dial up) At least the time is referenced to dial up internet in PSE5. So the speed dialog box gives you this information, [1st]; size of photo (in KB) [2nd]; time to upload, (in seconds), [3rd], reference internet speed.
If you plan on re-editing your photos at a later date, you should consider saving in a lossless format. Both PSD and TIFF file formats support saving in layers, and don't "recompress" the file each time it's worked on. "PSD" is Photoshop's native format, so it could be argued that this would be the better of the two. Since a scanner in "lossless" mode would save in TIFF, Photoshop would need to convert those files to PSD. A jpeg file would be better suited to a photo in which the editing process has been finalized, and is heading to the printer, or perhaps Aunt Martha in an Email.
A final thought is that the quality you use to "jpeg" a file, and the file size itself, is largely purpose dependent. For example a photo that you intend to make public on "Flickr" should be down sized and and jpegged at medium quality. This in the event that the photo is downloaded, your work will not be at full resolution and quality, therefore limiting its usefulness to viewing only. In any event, a photo uploaded to the web absolutely should be a COPY, do not tamper with an original in the manner in which I've just described. -
How to save jpeg files in iPhoto
I would like to be able to make changes in Photoshop and then be able quickly save a jpeg file in my iPhoto library (Version 9). From what I could deduce, the only way to do this would be to save the file to my hardrive, then go to iPhoto, choose the import to library under the File menu and then locate the file I want to import. Is that really the quickest and easiest way to do this? Or is it possible to save the file directly to the iPhoto library from within the Photoshop program?
Using Photoshop or Photoshop Elements as Your Editor of Choice in iPhoto.
1 - select Photoshop or Photoshop Elememts as your editor of choice in iPhoto's General Preference Section's under the "Edit photo:" menu.
2 - double click on the thumbnail in iPhoto to open it in Photoshop. When you're finished editing click on the Save button. If you immediately get the JPEG Options window make your selection (Baseline standard seems to be the most compatible jpeg format) and click on the OK button. Your done.
3 - however, if you get the navigation window
that indicates that PS wants to save it as a PS formatted file. You'll need to either select JPEG from the menu and save (top image) or click on the desktop in the Navigation window (bottom image) and save it to the desktop for importing as a new photo.
This method will let iPhoto know that the photo has been editied and will update the thumbnail file to reflect the edit..
NOTE: With Photoshop Elements the Saving File preferences should be configured as shown:
I also suggest the Maximize PSD File Compatabilty be set to Always. In PSE’s General preference pane set the Color Picker to Apple as shown:
Note 1: screenshots are from PSE 10
Note: to switch between iPhoto and PS or PSE as the editor of choice Control (right)-click on the thumbnail and select either Edit in iPhoto or Edit in External Editor from the contextual menu. If you use iPhoto to edit more than PSE re-select iPhoto in the iPhoto General preference pane. Then iPhoto will be the default editor and you can use the contextual menu to select PSE for your editor when desired.
OT -
Photoshop doesn't save file extension
I'm using PS cs5.1 64 bit and Bridge cs5 in Win7 Pro 64 bit.
When I "Save As", photoshop won't write the file extension unless I explicitly type it (i.e. i have to type "filename.psd" as opposed to just "filename") in the file name text box.
If I Save As the file without specifying the extension, bridge simply displays a blank page icon for the file, and if I double click it, I get the "don't know what application to use" dialog. If I select photoshop as the program to use, ps will open the file correctly.
However, even after I change the filename in bridge by adding the extension, bridge displays the PS icon, but won't preview the file (doesn't show a thumbnail).
If I want bridge to show a thumbnail, I have to re-open the file in PS, then Save As, remembering to explicitly specify the extension. THEN, Bridge will show a thumbnail.
How can I correct this? I've gone through the preferences dialog and have "save lowercase extension" checked, but this appears to be a preference for case of saved extension, not a specification that an extension should always be saved.
btw: I tried the regedit fix specified on other help forums, but this didn't help.
Thanks.I think I figured it out.
I was saving filenames which contain "." in the name (e.g. "BO.HG.M.psd").
When I saved the file with the name "BO_HG_M", photoshop appended the .psd extension for me, and bridge is happy.
Because of the application of the images, it's important that we use the "." format for the names, so I'll just live with it and try to remember to type the ".psd" on the end.
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