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问题 I am creating animated calligraphy using the stroke-dashoffset technique, applying the stroke as an animated mask on top of an SVG. This works on most browsers, but I would like to apply the same mask on top of a PNG instead. That way, even if the browser has trouble with both SVG and mask (IE...), at least it will just display the PNG as-is. Here is a codepen of the working calligraphy with pure SVG: https://codepen.io/benviatte/pen/PMzmYB Here is the codepen of the non-working calligraphy

问题 I try to plot two horizontal lines in a coordinate system using GNUPlot. The two lines represent average values in two datasets. Each dataset has the following constants: max , min and average . The same logic is to be applied to both datasets, so we can simply focus at one of them. The output should be a 800 x 800 PNG image. They share the X axis, but their Y axis is different from each other in terms of the ranges' values and unit of measurement. Naturally, the numerical values of the two

问题 I am trying to make a simple game in Java. I want to know how I can read a PNG file and use it in the game using only the OpenGL library. Can anyone provide any code that could accomplish this? 回答1: You can't load a texture directly using a single API call. You can however load a BufferedImage through ImageIO, and then convert it to an OpenGL texture. Example source code can be found here TextureLoader 回答2: You can't load images only using OpenGL. You should always keep in mind that OpenGL is

问题 What have I done wrong? It works with jpg and gif but not transparent png files. Checked some of the other questions but didn't understand since I am not that good with php. Would really appreciate if some one could fix this! <?php # ========================================================================# # Requires : Requires PHP5, GD library. # Usage Example: # include("resize_class.php"); # $resizeObj = new resize('images/cars/large/input.jpg'); # $resizeObj -> resizeImage(150, 100, 0); #

问题 everybody. I'm trying to place ".png" image over the video capture using java and opencv. I performed the tutorial from the official opencv java website http://opencv-java-tutorials.readthedocs.io/en/latest/04-opencv-basics.html In this tutorial everything works fine with png image from the tutorial. But when i try to load my own png image with alpha channel, i get the wrong result. Png image displays with white spaces. Here is the print screens of video capture with both images: correct

问题 everybody. I'm trying to place ".png" image over the video capture using java and opencv. I performed the tutorial from the official opencv java website http://opencv-java-tutorials.readthedocs.io/en/latest/04-opencv-basics.html In this tutorial everything works fine with png image from the tutorial. But when i try to load my own png image with alpha channel, i get the wrong result. Png image displays with white spaces. Here is the print screens of video capture with both images: correct

问题 I want to convert a transparent png image to greyscale without losing its transparency. The problem is the algorithm that I am using in is converting the transparent part into Black, which some picture with black character wouldn't be shown. To give you an idea. Heres the original picture : Look what happens when I pass it through the algorithm. The algorithm : public static void ToWhiteBlack(Bitmap original) { try { for (var i = 0; i < original.Width; i++) { for (var j = 0; j < original

问题 I need an easy way to detect what PNG is being being uploaded. I tried getimagesize but it returns bits 8 for both PNG8 and PNG24. Anyone have an idea how to detect it an image is PNG8, aka bit depth of 8. Thanks! 回答1: Try this to detect PNG8, PNG24 and PNG32: <?php $file = new SplFileObject('png8.png'); $realPath = $file->getRealPath(); if ($realPath === false) { throw new RuntimeException(sprintf('File not found: %s', $file->getFilename())); } $file->rewind(); if ($file->fread(4) !== chr

问题 I am getting a response body with raw response, which is supposed to respresent a png image. My question is how to decode this and make it a renderable. PS: when I am use postman to test this, I realized that Postman can render this raw string, and I am wondering how it does it. �PNG IHDR�X:�(� pHYs���o�d IDATx���\�w����v,J�L�2b�_٬�N��d��0|� cmDN�6�y.�q�{�Iӌ�hsnNcl��g~/;"vʯ�m�('}�Q9��q�P(G:�������z= ���q��|=_�\�p�""""""�p�w""""""b �""""""J�PDDDDD�A)������8(B�@("""""�EDDDDD���������R qP �"""""

问题 I'm trying to convert SKSpriteNode as a PNG image with transparency to Camera Roll. This saves the image but not with transparency: let image = UIImage(cgImage: (spriteNode.texture?.cgImage())!) UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil) This complains: Cannot convert value of type 'Data?' to expected argument type 'UIImage' let image = UIImage(cgImage: (createdCloudShadow.texture?.cgImage())!) let image2 = UIImagePNGRepresentation(image) UIImageWriteToSavedPhotosAlbum(image2, nil,