Maximum File Size

[Big_K]

I have version 7 of Labview and IMAQ Vision. I am trying to open some files with IMAQ Readfile , but the following happens : Opens a file of size 165 megs ok , next largest file is 191 megs , fails to open and probing the error line says " Not enough memory for requested operation." My machine has 768 megs of RAM and runs WinXP. Is there a limit on file size for an IMAQ Image ? Will more RAM help or is this a Windows limitation? The files are 8 bit tif's .
Thanks

[Brent_R]

There is not a memory size limitation for an IMAQ Image. Adding more RAM will always help, however I belive you should easily be able to open a 191MB file with the resources you currently have. My machine has only 512MB RAM and I can reliable open 244MB (256 million bytes, 16k x 16k) images and sometimes as much as 280MB. I have spoken with other engineers working with images in the 300-400MB range.

IMAQ does require a continuous segment of memory for a each image, so it's possible that there is enough total memory avalaible, but not enough in any one segment. Try closing any unused applications that might be fragmenting the memory (browser, instant messanger, etc.). Launch the task manager and close any unnecessary processes. Acrobat, for example, can be a re
al memory hog, even if there's no pdf showing and you think it's closed.

It is possible to make windows run in a smaller memory footprint, however RAM is very cheap, time is usually not.

Regards,

Brent R
Applications Engineer
National Instruments

[Big_K]

Thanks ,I will try more RAM.