Compare RBG values and get color at mouse click location

[Blake81]

I want to make a program for someone at work that does the following:

-Lets them select an image to load into a PictureBox
-Gets the RGB value of the color where they click on the image
-Compares that RGB value to a set of colors which I will store in a file or hash table and picks the closest match.

This seems like a pretty simple project, but I don't know how to do it. I don't know about getting the RGB value at the cursor location, and I'm not sure how to go about doing the comparison to pick the closest color. I would appreciate any help.

 

[JohnH]

Dim thecolor As Color = DirectCast(PictureBox1.Image, Bitmap).GetPixel(x, y)

x/y is image coordinates, zero based for image width/height in pixel dimensions. Use the MouseDown event on Picturebox, it supplies coordinates in e parameter.

 

[fuman5]

GetPixel

I would like to know all of the uses of getpixel. Is there a link you can send, or a site, or a book.

Thanks

 

[JohnH]

There is only one use of GetPixel function and that is to retrieve the Color value at specified coordinate.

 

[Александръ]

Nice...

DirectCast is kinda like WildCard... just does what you need when all the painful methods I spent six hours trying and searching for fail.... however, this one fails too if I try to use it on a Graphics object. I actually figured out how to get around it by keeping two copies of the PictureBox on hand: one for graphics (and therefore display), and one for Image (for accessing pixels). But, if someone is ever around and knows how to access arbitrary pixels in a graphics object (either that or how to make an image display in a PictureBox), feel free to post it here. Thanks for the DirectCast: I hope it will come into use some time again.