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2015-10-13 22:17:48 -0600 | asked a question | How to change transparency of an 4 channels image? Give a alpha degree and set image transparency. I didn't find the API to do this. |
2015-10-13 21:26:20 -0600 | asked a question | How to get pixel format of a Mat()? I need to detect the pixel format of a cv::Mat() object, BGR or RGB or BGRA or RGBA or YUV or some else. I know OpenCV use BGR/BGRA by default, but you can use cvtColor to change it, what I need is going to detect the pixel format for any cv::Mat() object. Thanks a lot. |
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2015-10-13 04:56:39 -0600 | commented question | How to overlay an PNG image with alpha channel to another PNG? Please check the attachment links at the end of this post. |
2015-10-13 03:49:14 -0600 | received badge | ● Editor (source) |
2015-10-13 03:45:42 -0600 | asked a question | How to overlay an PNG image with alpha channel to another PNG? I have two PNG images (overlay.png and underlay.png) both with alpha channel. I tried the addWeight and copyTo API to mask overlay.png to underlay.png, but the result image is not what I want. overlay.png underlay.png result png i wish This is my test code: And this is the original image files: overlay.png underlay.png How can I get the result I wish? Thanks a lot! |
2015-10-12 20:44:55 -0600 | commented question | PNG transparent channel lost after perspective transformation. Thanks, I used cv::imread(path, CV_LOAD_IMAGE_UNCHANGED) to resolve this question, thanks a lot. |
2015-09-25 00:36:09 -0600 | asked a question | PNG transparent channel lost after perspective transformation. I am perspective transform a RGBA PNG image (depth:8, channel: 4, background: transparent), but the transparent background turns into black after transformation. What's wrong with the following code? I am a new guy to OpenCV, thank you! } |