How to plot a graph between (R,G,B) values and pixel coordinate ?

[Hussain]

I am developing an application which can find its applicability in many physics problems. For now, I want to plot a graph between the Green pixel intensity value vs the pixel coordinate. For simplicity I want to extract Green pixel information of the image in the canvas keeping the y coordinate fixed  (canvas height/2) in the middle by scanning along x coordinate using a timer. With the timer the application will determine the Green pixel intensity in each x coordinate and plot in the canvas simultaneously. But till now I have failed to fetch the pixel data in the y coordinate of the graph or unable to plot the same. This is not the first time that I am seeking help, I have got help in most of my research work from this platform regarding development of the required app and I do acknowledge everywhere. Please help me with this issue, this may help me a lot. 

Thanking you in advance.  

Regards,

Iftak

[Juan Antonio]

Hi Hussain,

I disable your Timer and enable my Clock1, then I add this code...

I get number color x pixel, example... -16456434

Then in this Spanish tutorial convert this number in RGB (in Spanish is RVA)

http://kio4.com/appinventor/20C_decimal_rva.htm

With number V (Verde) Green you can plot.

Perhaps this help for you

Regards.

[Hussain]

Dear Juan, thanks your code is working well in extracting the color values but I am not able to plot the dynamic color values with the variation in time interval. I am trying to place the dynamic color values as the y- axis but it is not working. Please again help me with this.

Regards,

Iftak   

[Juan Antonio]

Hi,Hussain, try this code...

http://kio4.com/appinventor/20C_decimal_rva.htm

[Hussain]

Thank you so much dear Juan. This is exactly what I intended to do. This may significantly help me in my work.

Regards,

Iftak