How to do the opposite of PSet in VB

[ChrisC]

I am a casual VB programmer, using VB5.

I know that to set a specific pixel at X,Y on Form1 to red, I simply need to use the following:

Form1.PSet (X,Y), RGB(255, 0, 0)
 

But, what if I have set the Picture property of Form1 to a .jpg file at design time, and then at run time, I wish to know the Red, Green, and Blue composition of a specific pixel on Form1? Thanks for any help, even if it's just a confirmation of my fears: "There is no opposite to PSet in VB5. You will have to instead write code to break down the .jpg"

[Killer42]

I think what you are referring to as the "opposite" of Pset is in fact the Point property. However, this will return a single Long value. You will need to break it down into R, G and B components. That's is not difficult though.

Where it does get slightly more complex is when the colour is a system colour number (Eg. "button face") rather than an RGB value. There is a straightforward routine to detect and convert this, but I don't recall the details. Just be aware of it - you should be able to find it with a search on TSDN or the wider web if and when you need it.

Note also, you may get unexpected results depending on the AutoRedraw setting.