transparency

问题 I'm using ffmpeg to scale my WEBM file, by using below command: ffmpeg -i in.webm -c:v libvpx -vf scale=100:100 out.webm The output has correct resolution as I expected but the problem is transparency become black background. Could someone give me a solution for this. Thank you so much. Below is the log of the operation: ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib -

问题 I'm using ffmpeg to scale my WEBM file, by using below command: ffmpeg -i in.webm -c:v libvpx -vf scale=100:100 out.webm The output has correct resolution as I expected but the problem is transparency become black background. Could someone give me a solution for this. Thank you so much. Below is the log of the operation: ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib -

问题 I'm using ffmpeg to scale my WEBM file, by using below command: ffmpeg -i in.webm -c:v libvpx -vf scale=100:100 out.webm The output has correct resolution as I expected but the problem is transparency become black background. Could someone give me a solution for this. Thank you so much. Below is the log of the operation: ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib -

问题 I'm using ffmpeg to scale my WEBM file, by using below command: ffmpeg -i in.webm -c:v libvpx -vf scale=100:100 out.webm The output has correct resolution as I expected but the problem is transparency become black background. Could someone give me a solution for this. Thank you so much. Below is the log of the operation: ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib -

问题 I created a simple form to test in winapi: I uploaded here: http://pastebin.com/7dNjE1Tb I would like to put a simple png file to my hwnd, for example this picture: http://www.ledavi-network.com/includes/images/bg_shadow_png.png I know I should use this: http://msdn.microsoft.com/en-us/library/windows/desktop/dd145141(v=vs.85).aspx but I am very new in winapi and I dont find any example how to use this TransparentBlt function. Someone could help me to create a very simple example? EDIT: But

问题 I have sign (signs with arbitrary shape) images with white background and I want to get an image of the sign with transparent background. I have managed to create a mask and apply it to the image and thought making the mask transparent would be doable. I searched a lot here and elsewhere, but nothing really helped me. import cv2 import numpy as np file_name = "/path/to/input/img/Unbenannt.jpg" # can be also .png img = cv2.imread(file_name) gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) th,

问题 I have sign (signs with arbitrary shape) images with white background and I want to get an image of the sign with transparent background. I have managed to create a mask and apply it to the image and thought making the mask transparent would be doable. I searched a lot here and elsewhere, but nothing really helped me. import cv2 import numpy as np file_name = "/path/to/input/img/Unbenannt.jpg" # can be also .png img = cv2.imread(file_name) gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) th,

问题 I have an image (a captcha) that I download from the web. When I loaded to opencv it seems to loose its properties or simply mixes the transparent background with the dark/black colors: Currently the code does nothing but loading a writing again: captchaImg = cv2.imread('captcha1.png') cv2.imwrite("captcha2.png", captchaImg) I have tried loading also with options 0, 1, 2, 3 but the result is the same. 回答1: Well this is a problem with opencv and it has a solution with opencv but it is kind of

问题 I have an image (a captcha) that I download from the web. When I loaded to opencv it seems to loose its properties or simply mixes the transparent background with the dark/black colors: Currently the code does nothing but loading a writing again: captchaImg = cv2.imread('captcha1.png') cv2.imwrite("captcha2.png", captchaImg) I have tried loading also with options 0, 1, 2, 3 but the result is the same. 回答1: Well this is a problem with opencv and it has a solution with opencv but it is kind of

问题 I would like to write a program perferably in Java that can display animated overlays on a screen. The screen will then be broadcast streamed over the internet using a separate program called x-split. A good way to do this would be to create a transparent window in java which will display animated files (with transparancy) and the output of this window (Its display) should ideally appear in the webcam device list so it can be easily picked up by x-split which will allow it to be arranged