graphicsmagick

问题 I want to make a Google Cloud Function that will correctly set the content type of uploaded files. I know how to do this with GraphicsMagick or ImageMagick, but I'm not sure if Google Cloud Function has those native libraries. How do I find out if they have them or failing that how do I get them installed? 回答1: Google Cloud Functions run in a container that has ImageMagick installed. Somehow the Firebase documentation seems to have best documentation for it. From there: Cloud Functions

问题 I want to make a Google Cloud Function that will correctly set the content type of uploaded files. I know how to do this with GraphicsMagick or ImageMagick, but I'm not sure if Google Cloud Function has those native libraries. How do I find out if they have them or failing that how do I get them installed? 回答1: Google Cloud Functions run in a container that has ImageMagick installed. Somehow the Firebase documentation seems to have best documentation for it. From there: Cloud Functions

问题 I want to switch from Image Magick to Graphics Magick. The following code converts an image to PNG: var ImageMagick = require("imagemagick"); // convert the image ImageMagick.convert([ "input.jpg" , '-resize' , "200x100" , "output.png" ], function(err, stdout){ if (err) { throw err; } console.log(">> Done"); }); How can I do the same but using Graphics Magick? 回答1: Using resize and write methods: var Gm = require("gm"); Gm("input.jpg").resize(200, 100, "!").write("output.png", function (err)

问题 I want to switch from Image Magick to Graphics Magick. The following code converts an image to PNG: var ImageMagick = require("imagemagick"); // convert the image ImageMagick.convert([ "input.jpg" , '-resize' , "200x100" , "output.png" ], function(err, stdout){ if (err) { throw err; } console.log(">> Done"); }); How can I do the same but using Graphics Magick? 回答1: Using resize and write methods: var Gm = require("gm"); Gm("input.jpg").resize(200, 100, "!").write("output.png", function (err)

问题 I am using ImageMagick to programmatically reduce the size of a PNG image by reducing the colors in the image. I get the images unique-colors and divide this by 2. Then I assign this value to the -colors option as follows: variable = unique-colors / 2 convert image.png -colors variable -depth 8 I thought this would substantially reduce the size of the image but instead it increases the images size on disk. Can anyone shed any light on this. Thanks. EDIT: Turns out the problem was dithering.

问题 //Created a promise for each image size. var promises = sizes.map(function (size) { return new Promise(function (resolve, reject) { var destinationDir = fileUtil.getAbsolutePathOfImage(destinationPath); fileUtil.createDirectoryIfNotExists(destinationDir); destinationDir += size.src; fileUtil.createDirectoryIfNotExists(destinationDir); //Resize the image. //console.log('imagefile : ' + JSON.stringify(imageFile)); //console.log('destinationDir: ' + JSON.stringify(destinationDir)); //Called an

问题 I am trying to achieve the following: 1) I have a byte array on the java side that represents an image. 2) I need to give my native code access to it. 3) The native code decodes this image using GraphicsMagick and creates a bunch of thumbnails by calling resize. It also calculates a perceptual hash of the image which is either a vector or a unint8_t array. 4) Once I return this data back to the Java side different threads will read it. The thumbnails will be uploaded to some external storage

问题 I am trying to achieve the following: 1) I have a byte array on the java side that represents an image. 2) I need to give my native code access to it. 3) The native code decodes this image using GraphicsMagick and creates a bunch of thumbnails by calling resize. It also calculates a perceptual hash of the image which is either a vector or a unint8_t array. 4) Once I return this data back to the Java side different threads will read it. The thumbnails will be uploaded to some external storage

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I want to convert following HTML to PNG image in Python. <html> <b>Bold text</b> </html> This HTML is, of course, an example. I have tried 'pisa' but it converts html to PDF, not to image. I can convert HTML to PDF and then convert PDF to PNG, but I was wondering if there is any direct solution (i.e HTML to PNG).