i'm using a pixel value levels to separate peaks from other small plateus.
If wave > vales ->peak
else -> not a peak

This is a ECG image processing task.I totally removed the background grid and other noises before getting this output.
calculations totally depend of scanned image DPI values.

can you suggest a best way to store these values? waht is the most suitable method? 2D arrays or lists?

i use a grey scale image.(after applying a threshold )So R value is enough to separate the black pixels.
yep.i have to change the for loops to change the pixel reading direction.agree with you.

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thanks a lot buddy