IMAQ GetPixelValue - "You specified a point that lies outside the image."

[Aidan85]

Hi,

I'm trying to implement Floyd-Steinberg dithering on a jpeg image. I'm using the IMAQ GetPixelValue VI to obtain the pixel value from coordinates that are passed into the VI. I'm starting at 2,2 but each time I try to run my VI I get the error message "You specified a point that lies outside the image."

Can anyone point me to what I'm doing wrong?

Thanks.

Code attached (I'm using LV2010 v10)

[Bob_Schor]

Can you also provide a sample image that produces the error you see?  I'm curious when and how the error manifests itself, would be an important clue what is going wrong.

Bob Schor

[Aidan85 · Accepted solution]

Hi..

It seems I was being incredibly dense (for a number of reasons).. my code was running but would scan past the last pixel without incrementing the y-axis, which was causing the error.. I was also adding unnecessary levels of complexity setting an ROI when I could read the pixel directly using the GetPixelValue.

Serves me right for doing LabVIEW at 2am!!

[Bob_Schor]

It's always a Good Sign when you find your own errors (goodness knows I've found a few real Klunkers that I've made ...).  Congratulations!

Bob Schor