.net - C# Graphics Newbie Question -

-

I have some small transparent GIF images (less than 100x100) and I have given the code below through all the pixels Written Rgb value to iterate: 

  Private zero IteratePixels (string file path) {string dataFormat = String.Empty; Bitmap ozbitmap = new bitmap (file path); Int counter = 0; For (int y = 0; y & lt; objbitmap.Height; y ++) {for (int x = 0; x & lt; objbitmap.Width; x ++) {color col = objbitmap.GetPixel (x , Y); DataFormat = String.Format ("{0} => red: {1: x} green: {2: x} blue: {3: x}", counter ++, colonel, colonel, colonel b); System.Diagnostics.Debug.WriteLine (dataFormat); // Here is an operation on the color value here // objbitmap.SetPixel (x, y, col); Code} works (although the speed of the pixel and string is slow due to formatting) but what was the biggest surprise to me that the output is reporting that the transparent pixels are black! I wonder why? 
 
 0 => red: 0 green: 0 blue: 0 
 1 => red: 0 green: 0 blue: 0 ... 
 
 Now if I have the image 25% of the area covered is a transparent GIF image with a black background, so how do I know if the pixel is tranparent or black?

The images actually have 4 features: red, green, blue and alpha.

How transparent alpha is an area. GIF images are not only transparent / transparent, as opposed to other formats, such as PNG has full alpha support, so that you can work as 40% transparent pixels.

You can call it in your code.

For reference, the MSDN color structure is


Comments

Post a Comment

Popular posts from this blog

c# - ListView onScroll event -

-
I am programming a simple C # application, and I need a Scallow event on the list view. So I inherited the original ListView class created in ListviewEx witch. I found out how to locate the scroll message from WinAPI and I modified the WndProc method. Now I have this WndProc: protected override zero WndProc (Ref message message) {base.WndProc (Ref I); If (m.msg == WM_VSCROLL) {onScroll (This, New EventArgs ()); }} But the problem is, I do not know how to know about scrolling information. This data should be in wParam, but there is a LOWORD macro ++ like in C in C # and I switch to find the criteria like SB_ below, SB_ENDSCROLL, SB_PAGEUP etc. there any way Need to change the LOWORD macro from C #? Or any other way to find the necessary parameters about scrolling? You can define the WParam constants as the following: Private const int WM_HSCROLL = 0x114; Private Constant WM_VSCROLL = 0x115; Private contact int SBHOZZ = 0; Private Consultant SB_VERT = 1; Private Con...
Read more

PHP - get image from byte array -

-
I am trying to create a back-end for my mobile application. I am sending the content of an image in the body of the HTTP request (output stream) as a byte array, I want to read this stream of bytes in PHP scripts and take back an image. Can anyone tell me how can I do this? Thank you. You can obtain the request body $ body = Reading from file_get_contents ('php: // input'); What you do with that data Depending on you, you can write the data in a file as you mentioned that this is image data, you can drop the data into the object can do. Another option is to use and load the image.
Read more

Linux Terminal Problem with Non-Canonical Terminal I/O app -

-
I have a small app written in C to run on Linux. Part of the app accepts user-input from keyboard , And it uses non-canonical terminal mode so that it can respond to each keystroke. The section of the code that accepts input is a simple task that is called repeatedly in the loop: char get_input () {char C = 0; Int res = reading (input_tamille, & amp; c, 1); If (RSS == 0) 0 returns; If (res == -1) {/ * snip error handling * /} return c; } It reads a letter from the terminal if there is no input within a given time limit, (c_cc [VTIME] value in the vocabulary structure), read () 0 And get_input () is called again It all works very well, I have recently discovered that if you run this app in a terminal window, and then the app Close the terminal window without ending, the app will not exit Received, but CPU intensive launches into an infinite loop, where the read () returns 0 without waiting continued. So how can I get out of the apple if it runs from the terminal win...
Read more