ImageMagick

问题 I'm using GCC 4.7.2, C89, and ImageMagick-6.8.0-4. I am trying to take a screen shot using the ImageMagick API. I have downloaded, compiled, and installed the headers and libraries. However, I can't see in the documentation the API calls to do the screen shot. I will be linking and including the headers so that I can call the API from my C program. I just want the name of the function I will have to use to do this. Can anyone point me in the right direction? Can ImageMagick take screenshots?

问题 I'm using GCC 4.7.2, C89, and ImageMagick-6.8.0-4. I am trying to take a screen shot using the ImageMagick API. I have downloaded, compiled, and installed the headers and libraries. However, I can't see in the documentation the API calls to do the screen shot. I will be linking and including the headers so that I can call the API from my C program. I just want the name of the function I will have to use to do this. Can anyone point me in the right direction? Can ImageMagick take screenshots?

问题 I need to generate small thumbnails from potentially gigantic images (10,000 x 10,000). I'm using ImageMagick and PHP running in Google App Engine. My GAE has a hard memory limit of 512 MB. I've been trying to read the documentation for the imagemagick php extension, but the docs are pretty thin. I found this SO post that has an answer from the maintainer and tried to adapt their code. I tried to set the resource area so that images which were larger than 2000x2000 pixels would get swapped

问题 I'm trying convert to white or transparent some rectangles areas within the below image. I'm able to make it with ImageMagick with the following command, that first makes transparent desired colors and finally convert to black the rest with "negate". convert input.png \ -transparent '#4B8DF8' \ -transparent '#27A9E3' \ -transparent '#2295C9' \ -transparent '#E7191B' \ -transparent '#C91112' \ -transparent '#28B779' \ -transparent '#17A769' \ -transparent '#852B99' \ -transparent '#751E88' \

问题 I am having these two pictures, labeled 1.png and 2.png , respectively: When I run this code from ImageMagick in my Linux terminal: composite -blend 75 -gravity West 2.png 1.png prueba.png I get this result: However, I would like the logo ( 2.png ) to be half or one-third size reduced and placed in the bottom left corner. How can I do it from the terminal? 回答1: You can do that in ImageMagick by using the convert syntax. It is more flexible than the composite syntax. convert 1.png \( 2.png

问题 We use gifs for our blog extensively. We used to embed tenor nano gifs(90px height maintaining aspect ratio, used for GIF previews and shares on mobile) in it. Now we wanted to create our own gifs and are using the following command to convert mp4 to gif while maintaining the properties of tenor's nano gif. using ffmpeg version 4.1.4 But we observed a huge difference in size between the gif we created and the one created using tenor. ffmpeg -i input.mp4 -filter_complex "[0:v]fps=10,scale=-1

问题 I am using the R programming language. I am trying to combine a HTML file and a JPG Image file together. My code looks something like this: library(plotly) library(shiny) library(magick) #create widget_1 widget_1 = plot_ly(iris, x = ~Sepal.Length, type = "histogram", nbinsx = 20) #upload some jpg image from your computer into R my_image = image_read("my_image.jpg") doc <- htmltools::tagList( div(widget_1, style = "float:left;width:50%;"), div(my_image,style = "float:left;width:50%;") )

问题 I want make 2 different colors on the output image when using Imagemagick. I have an original image with "Hello World" in it. And a modified image with "Hello Warcraft" in the same area. The default compare command will give me a image and mark all the differences with red. Now I want to use 2 different colors like "orld" marked as red, and "arcraft" marked as another color, maybe blue. Is ImageMagick able to do this? If not, how to use ImageMagick to transfer a specified color to another one

问题 I'm trying to use ImageMagick to create thumbnail images that are 3840 x 2160. I need the image to have a black background and white text. The text should be centered vertically and horizontally. I want to be able to set a font size, but if the text would extend off the image, automatically decrease the font size so it fits with some amount of padding on the left and right. I will be doing this in bulk with several hundred thousand images. From what I've been able to find, it looks like you

问题 I have created the morphing animation using image magick. i am using this reference page Imagemagick transitions between multiple images -- need idea I have used this code to do the above convert -delay 20 *.jpg -morph 14 g2b.gif And now i am getting perfect animation for one way. means it is animated from start point to end point. but i want the reverse way also. There are 2 images and i want to create a morphing animation from both side. I have got one way animation from the two images.