Jpg to 3D plot

I have a ~3Mpixel photo (jpg) that I want to reproduce in a three dimensional plot showing pixel coordinate (x and y axes) versus intensity (z axis) - the photo is basically a grey-black (has an intensity gradient) spot on a glass plate. In some imaging software it is possible to convert the image to grayscale (which might not be necessary - the image is already quite 'black and white'), and manually extract the intensity of each pixel (a number from the colour map: 1-256 (or is it 255??)) by hovering the mouse pointer over a very much zoomed picture. I have done this previously with lower resolution webcam images but I can't do it for 3Mpixels!!! Can LabVIEW help?
I've used the read jpg VI, and get my 3Mpixels of flattened data - but the numbers don't range from 1-256 as in the imaging software. This is not surprising since I haven't specified a colour map - how can I do this (use the grayscale colour map from the imaging software)?
It might also help to note that the area of the photo I'm interested in (the spot) is less than 1/4 of the total photo so I could probably cut out some of the blank space (if I knew how to use 'rect' - I don't have a clue what the description for this means "specifies the rectangle whose upper-left corner is at 0,0 and that is the exact size of the pixmap" (shown in the context help) - what is a pixmap? where are top, bottom, left and right? Surely a rectangle has top-left, top-right, bottom-left and bottom-right?
Excel (which I normally use) can't cope with a 3Mpixel plot so it would be nice if I could also PLOT the image in LabVIEW.
Help! I've attached the raw jpg image and the same converted to grayscale using PhotoImpact software.
Attachments:
PICT0016.JPG ‏553 KB
GRAYSCALE.JPG ‏89 KB

Here is a screenshot of the block diagram.
Attachments:
image subset.png ‏27 KB

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"jjparnet" a ecrit dans le message news:
[email protected]..
> hi,
>
> i'am a beginner in LV and i need some help !
>
> well, i have an array with data (ex x=1..10 y=15,16,24,..).
> i would like to plot them on a graph and then change the points
> position.
>
> - fisrt, with my mouse (dragging)
>
> - second by changing values on the array. and that without stopping
> anything or pushing a bottom. I just want to change the values and
> then update the graph in real time.
>
>
> thanks a lot for your help.
>
> if you have examples or hints you can send them at this adress :
> jean-jacques.parnet@steria
.fr
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