Cut transparent parts image

Question

The updated image:

thanks you very much man but i wanted to do somthing little different, to cut each rectangle here as a sperate image.Lets try first to find the blue b

Answer 1

I'll write this in pseudo-ish-code since you should be able then to apply it to any type of image or language...

var minX = 10000
var maxX = -10000
var minY = 10000
var maxY = -10000

for (var y = 0 to height)
{
    for (var x = 0 to width)
    {
        if (pixel(x,y).Color != transparent)
        {
            if (x < minX) minX = x
            if (y < minY) minY = y
            if (x > maxX) maxX = x
            if (y > maxY) maxY = y
        }
    }
}

var cropRectangle = (minX, minY, maxX, maxY)

You can now use standard functions on the bitmap to get that area, which should be the area bounded by the non-transparent pixels.