alpha

I know you can do this with a UIImageView, but can it be done to a UIImage? I want to have the animation images array property of a UIImageView to be an array of the same image but with different opacities. Thoughts? I just needed to do this, but thought Steven's solution would be slow. This should hopefully use graphics HW. Create a category on UIImage: - (UIImage *)imageByApplyingAlpha:(CGFloat) alpha { UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f); CGContextRef ctx = UIGraphicsGetCurrentContext(); CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);

I need to merge two images (BufferedImage) in Java. It wouldn't be a problem if there was no transparency. The base image already has some transparency. I want to keep this as it is and apply a "mask" to it, the second image. This second image has no opaque pixels, in fact it's almost completely transparent, just has some less transparent pixels to give some sort of "light effect", like a reflex. Important detail: I don't want to do this on screen, with graphics, I need to obtain a BufferedImage with the resultant merge. Can anyone help me? Thanks! DETAILS: Merge two images maintaining

I'm using windows forms in C# and I need to make a textbox's background color transparent. I have a trackbar that goes from 0 to 255 that is supposed to control it, but I'm having some trouble. I created a question earlier today asking the exact same thing, but no success. Here is the code I currently have: private void trackAlpha_ValueChanged(object sender, EventArgs e) { newColor = Color.FromArgb(trackAlpha.Value, colorDialog.Color.R, colorDialog.Color.G, colorDialog.Color.B); colorDialog.Color = newColor; // The Windows dialog used to pick the colors colorPreview.BackColor = newColor; //