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问题 I have created a Doughnut and Bar chart using react-chartjs-2 library. Now I want to export this chart as png i.e the chart gets downloaded as png on user click. I have tried many ways but could not succeed. One of them was to use html2canvas library and get a screenshot but that is degrading the quality of chart. I am wondering is there any function in react-chartjs-2 library to directly export the chart? Edit- If someone can tell me about any other library in javascript in which I can make

问题 I have created a Doughnut and Bar chart using react-chartjs-2 library. Now I want to export this chart as png i.e the chart gets downloaded as png on user click. I have tried many ways but could not succeed. One of them was to use html2canvas library and get a screenshot but that is degrading the quality of chart. I am wondering is there any function in react-chartjs-2 library to directly export the chart? Edit- If someone can tell me about any other library in javascript in which I can make

问题 Is it possible in CSS to add color to a black & white image using a filter? I'm talking about using filters like it's possible in Photoshop, and an even better example would be the ones in Microsoft PowerPoint. What I'm trying to do is this: I have an image file of a black icon. I want to add a filter to it such that everything in the image (the background is transparent) will have the color I choose by using the filter, such that I'd be able to have the icon in whatever color I want. Like I

问题 What is a recommendable way to change the rgb values of a png image? Right now I'm using an example code to see the way libpng works, it only opens a png image and writes another png image, however I would like to change the RGB values of this new image so that it gets to be all blue, green or red, whatever is my choice, is there an efficient way to do it? Code: #include <stdlib.h> #include <stdio.h> #include <png.h> int width, height; png_byte color_type; png_byte bit_depth; png_bytep *row

问题 What is a recommendable way to change the rgb values of a png image? Right now I'm using an example code to see the way libpng works, it only opens a png image and writes another png image, however I would like to change the RGB values of this new image so that it gets to be all blue, green or red, whatever is my choice, is there an efficient way to do it? Code: #include <stdlib.h> #include <stdio.h> #include <png.h> int width, height; png_byte color_type; png_byte bit_depth; png_bytep *row

问题 I have an UIImage that I snap from the camera. I want to do some image manipulations so I transform it to a CIImage. CIImage *ciImage = [CIImage imageWithCGImage:snappedImage.CGImage]; Next I do my thing, and then transform it back to a UIImage: UIImage *image = [UIImage imageWithCIImage:ciImage]; If now I want to transform this to data to save it into Core Data for example: NSData *data = UIImagePNGRepresentation(image); the data ends up being nil on iOS 12. (works on iOS 13, same thing

问题 I have an UIImage that I snap from the camera. I want to do some image manipulations so I transform it to a CIImage. CIImage *ciImage = [CIImage imageWithCGImage:snappedImage.CGImage]; Next I do my thing, and then transform it back to a UIImage: UIImage *image = [UIImage imageWithCIImage:ciImage]; If now I want to transform this to data to save it into Core Data for example: NSData *data = UIImagePNGRepresentation(image); the data ends up being nil on iOS 12. (works on iOS 13, same thing

问题 I've been pulling my hair out for the past week trying to figure out elementary R coding but can't seem to get anywhere (haven't used R since 2013 not that its a great excuse). All I want is a 4x8 grid made up of 32 .png files (maps I've made), and I want to do it without loading one image file at a time (http://www.statmethods.net/advgraphs/layout.html). So I think I can load the images within the folder writing (please correct me if my beliefs are bs) img <- list.files(path='c:/a',patt=

问题 Is there a way to get the background of generated qr codes transparent when using phpqrcode? I am generating a PNG to disk. I found this but I think it is way outdated: The line suggested in that forum is ImageColorTransparent($target_image, $col); however it is not clear to me where it should go, if it is even meant to work with this current version of the code. <?php /* * PHP QR Code encoder * * Image output of code using GD2 * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010

问题 Is there a way to get the background of generated qr codes transparent when using phpqrcode? I am generating a PNG to disk. I found this but I think it is way outdated: The line suggested in that forum is ImageColorTransparent($target_image, $col); however it is not clear to me where it should go, if it is even meant to work with this current version of the code. <?php /* * PHP QR Code encoder * * Image output of code using GD2 * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010