transparency

问题 I have a customized UIView , its behavior is like this: after I load it from nib and add it to my view hierarchy, It firstly is almost transparent (alpha = 0.1), when I tap it, it becomes opaque (alpha = 1.0), after some time, it automatically becomes almost transparent (alpha = 0.1). The code in the customized view is like this, it works just as I described above: - (void)awakeFromNib { [self setup]; } - (void)setup { self.alpha = 0.1f; [self addGestureRecognizer:[[UITapGestureRecognizer

问题 Is there a way to get the background of generated qr codes transparent when using phpqrcode? I am generating a PNG to disk. I found this but I think it is way outdated: The line suggested in that forum is ImageColorTransparent($target_image, $col); however it is not clear to me where it should go, if it is even meant to work with this current version of the code. <?php /* * PHP QR Code encoder * * Image output of code using GD2 * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010

问题 Is there a way to get the background of generated qr codes transparent when using phpqrcode? I am generating a PNG to disk. I found this but I think it is way outdated: The line suggested in that forum is ImageColorTransparent($target_image, $col); however it is not clear to me where it should go, if it is even meant to work with this current version of the code. <?php /* * PHP QR Code encoder * * Image output of code using GD2 * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010

来源： https://stackoverflow.com/questions/56045557/matplotlib-add-a-custom-colorbar-that-runs-from-full-transparent-to-full-color

来源： https://stackoverflow.com/questions/56045557/matplotlib-add-a-custom-colorbar-that-runs-from-full-transparent-to-full-color

来源： https://stackoverflow.com/questions/28363963/click-through-a-transparent-image-in-wpf-or-silverlight

来源： https://stackoverflow.com/questions/63976450/how-to-convert-the-background-color-of-image-to-match-the-color-of-pygame-window

来源： https://stackoverflow.com/questions/63976450/how-to-convert-the-background-color-of-image-to-match-the-color-of-pygame-window

来源： https://stackoverflow.com/questions/63976450/how-to-convert-the-background-color-of-image-to-match-the-color-of-pygame-window

问题 I have a problem using transparent backgrounds in Swing. There are a lot of artefacts produced as swing is not repainting changed regions. As far as I can tell there are 2 out-of-the-box ways to use transparent backgrounds: an opaque component with transparent color set as background (left txt field) Problem : the transparent part of the background is never refreshed -> Artefacts. an non-opaque component with transparent color set as background (right txt field) Problem : background is not