Get image invoke method gives blank image when I try to capture waveform graph picture

Question

Hello
I am facing problem when try to capture waveform graph picture using invoke method Get image and write JPEG function, some times it gives blank images.I am using these functions inside nested loops.
ObservationsWith reference to attached VI)
(1) Sometimes  I found it captures images correctly when i run labview program first time but after that it starts writing blank images.
(2) Whenever i use flat sequence structure for waveform graph and get image node it always gives blank picture which indicates that execution of waveform graph and Get image should not be sequential.
(3) Whenever it gives blank image i checked the image data which is not valid data so it indicates problem is with Get image method or labview program flow(may be race condition between waveform graph and Get image method).
       I have attached vi ,please change path name and folder name in which images are being saved.I'm using labview 8.5.1 .
Attachments:
image_capture_problem.lvproj ‏6 KB
image capture problem.JPG ‏149 KB
0.0_10__3.jpg ‏2 KB

Answer 1

Hi,
I have tried sequence structure.But sometimes it also gives blank images. I have attached new vi which is using flat sequence. Run this vi 7-8 times then you will observe blank images. I don't know why?Any help will be greatly appreciated.
Attachments:
image_capture_problem.vi ‏69 KB