alpha

Is there a way to properly display an image with alpha channel (let's say PNG) in C# application? Thank you for any suggestions. UPDATE: OK, my question was a bit unprecise. I'd like to acquire real transparency of alpha channel - not filling with the parent's background color. In the image below we can see that the transparency is supported, but the part of the button that lies below the image is not visible. Is it possible to have a real transparency of the alpha channel of an image? Kristoffer Schroeder If that is winforms then no. "transparency" in winforms is not real transparency. What

I am just learning to work with OpenGL ES 2.0 for Android. I have been trying to simply display a texture on the middle of the screen, which was easy enough, but I cannot seem to get the PNG alpha to work properly. The image will either show with a black background, or the entire image will be blended into the background color slightly, depending on the settings I use. The actual tutorials I have followed to get to this point never worked with transparency, so I have tried to work in code I have found by searching around, and likely have just missed one important step. I have searched quite a

统计/etc/init.d/functions文件中每个单词的出现次数，并排序（用grep和sed两种方法分别实现） 方法一：grep实现 grep -o "\<[[:alpha:]]\+\>" /etc/init.d/functions |sort |uniq -c grep -o '[[:alpha:]]\+' /etc/init.d/functions | sort |uniq -c [root@centos7 data]# grep -o "\<[[:alpha:]]\+\>" /etc/init.d/functions |sort |uniq -c 21 a 5 A 1 aA 1 abnormally 5 action 1 active 1 ActiveState 1 adjust 1 alive 2 all 1 already 2 and 1 And 3 any 1 anywhere 1 Apply 1 are 1 arg 2 at 1 avoid 7 awk 8 b 1 backup 2 bak 29 base 2 basename 2 bash 7 be 6 BEGIN 1 bg 13 bin 11 binary 1 bit 2 booleans 1 boot 21 BOOTUP 2 break 3 but 1 by 6 c 1 caller 3 can 8

When I open png file: CImg<unsigned char> image("image.png"); ...I expect to get 4 channel (RGBA) image. But I always get 3 channel (RGB) image instead (even if the image is semitransparent): image.spectrum() returns 3 instead of 4. In my application, I always need to get 4 channels when I open PNG file. CImg looks like popular library with many useful features (some of which may be useful in the future in my image processing application), so I find it hard to believe that it is impossible to open PNG file with alpha channel without losing it. Any suggestions? If CImg is not very good tool for

According to MS KB entry , there is a quirk in CreateIconIndirect which recognizes HBITMAP s been created with BITMAPV5HEADER passed to CreateDIBSection (and BGRA channel layout). However, TBitmap instances with (PixelFormat = pf32bit) and (AlphaFormat = afDefined) (behaving as alpha blended for the other purposes) when referred by its Handle s are not being recognized as valid alpha blended bitmaps for creation of icons or cursors. Currently, I have to create a full copy of TBitmap using described API calls ( see ) to make CreateIconIndirect accept a bitmap handle as alpha blended. How do I

Is there any way to make an image half transparent? the pseudo code is something like this: from PIL import Image image = Image.open('image.png') image = alpha(image, 0.5) I googled it for a couple of hours but I can't find anything useful. I realize this question is really old, but with the current version of Pillow (v4.2.1), there is a function called putalpha . It seems to work fine for me. I don't know if will work for every situation where you need to change the alpha, but it does work. It sets the alpha value for every pixel in the image. It seems, though that you can use a mask: http:/

I have UIView with lots of subviews (UILabel, UITextView, etc.). If a set alpha 0.6 to main view all the subviews takes this alpha. How to set alpha separately of main view? [view setBackgroundColor:[[UIColor clearColor] colorWithAlphaComponent:0.5]]; //try this.. dont try to set alpha of UIView and also your subviews will not affect myView.layer.shouldRasterize = YES This will make it use group opacity and everything should composite as you'd expect. 来源： https://stackoverflow.com/questions/17079160/how-to-correctly-set-alpha-of-uiview-ios