alpha-transparency

According to the documentation for UIVIew @property(nonatomic) CGFloat alpha The value of this property is a floating-point number in the range 0.0 to 1.0, where 0.0 represents totally transparent and 1.0 represents totally opaque. This value affects only the current view and does not affect any of its embedded subviews. I have a container view configured as follows: self.myView.backgroundColor = [UIColor blackColor]; self.myView.alpha = 0.5; [self addSubview:self.myView]; And then add subviews to 'myView' [myView addSubView anotherView]; anotherView.alpha = 1; NSLog(@"anotherView alpha = %f"

Suppose you have any image (PNG or JPG). This image has a white background and I need to make this background transparent. I have tried with these examples: convert original.png -background none transparent.png convert original.png -background white -flatten -alpha off transparent.png but with no desirable results. How can I make it? IMPORTANT: Using convert command-line. Rijk I am using ImageMagick 6.6.9-7 on Ubuntu 12.04. What worked for me was the following: convert test.png -transparent white transparent.png That changed all the white in the test.png to transparent. Sandeep Pal I had the

I'm making a graphics editor for my class project and i want to make so that when, for example a user loads a picture in to the editor or or draw something in the PictureBox, all the alpha parts are shown the chessboard like background. My idea is that when I create a PictureBox with transparent background set, I create another one behind it, set its BackColor to white and add grey images 50x50, alternately horizontally and vertically. Is that a good approach to the problem? If, not do You have any suggestions? In Photoshop, for example, I create image 1600x1600. When I zoom to a certain level

I have a png that i would like to load in a TBitmap32. After I load the bitmap I call: Bitmap.DrawMode := dmTransparent; Bitmap.OuterColor := Bitmap.PixelS[0,0]; But then all white pixels are transparent. How can i do that just for the transparent part of the png image? Here is my image with the alpha transparency around the edge of the image indicated in the standard way. And this is the actual image: It seems that TBitmap32 may lose alpha information while loading a PNG image. You may consider to use the GR32PNG library of which a documentation excerpt follows: . . . since reading and

I need to create an alpha-gradient on the edge of the ImageView. Preferably using only XML. Image for example Here the solution the image look like below picture code for that : Prepare shape drawable res/drawable/gradient_shape.xml: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <gradient android:startColor="#00FFFFFF" android:endColor="#FFFFFFFF" android:type="linear" /> </shape> Define layout: activity_main.xml: <ImageView android:id="@+id/photo" android:layout_width="match_parent" android:layout_height="match_parent" android

I am trying to do an alpha blend operation of an RGBA image (foreground image), on to a RGB image (background image). However, while doing so I think I may be doing the wrong alpha blending operation or doing it wrong. For example, the pixel of my RGB image is a grayish color of (127, 127, 127). The pixel of my RGBA image for the pixel will be (0, 0, 255). After I do my blending operation, the final color will be (127, 0, 255). However, I thought that was more of an additive blend and different than the operation I am doing. For how my values are set, take a look at this incPixelColor[0] = 0;