ImageMagick

问题 I am trying to convert an image loaded in from a GIF via Magick++ into a cv::Mat . I have already converted from cv::Mat to Magick::Image but cannot seem to find how to pull the data out of an Image in Magick in order to load it into a Mat. What's the best way to do this? For reference, in reverse: Convert cv::Mat to Magick::Image 回答1: Updated Answer This is the best I can get it, I think! #include <opencv2/opencv.hpp> #include <Magick++.h> #include <iostream> using namespace std; using

问题 I'm attempting to use Imagemagic(RMAgick) to convert PDF-document into image. Original PDF is created from an image too(not native vector PDF). image = Magick::Image::from_blob(original_pdf) { self.format = 'PDF' } image[0].format = 'JPG' image[0].to_blob image[0].write(to_file.jpg) { self.quality = 100 self.density = 144 } But resulting image has too low quality, when printing. Original PDF has good quality in same time. I'm trying to use these options self.quality = 100 self.density = 144

问题 I have certain limitations that I won't specify that require me to use ImageMagick as a child-process. I have multiple base 64 strings of jpg files which I want ImageMagick to process. Specifically I want ImageMagick to join the jpg files together. If I had 2 regular jpg files then from the command line I would use the following format. node convert in_1.jpg in_2.jpg +append out.jpg in a js file I would use var spawn, magicCommands, imagic; spawn = require('child_process').spawn;

问题 I'm trying to get images resized to a given width , with the height being adjusted proportionally - no matter if the image has landscape or portrait orientation. I have two images I test the ImageMagick convert -resize command with and from what I have read, I would expect the following to work for any kind of image: convert source.jpg -resize 200 out.jpg The problem is, it doesn't. Here are my results: Source Image 1: landscape , 3264 × 2448 , resizes to 200 × 150 ==> WORKS Source Image 2:

问题 Having an imgage in.png . Now do the next: $ convert in.png -strip out.tiff #convert to tiff $ convert out.tiff -strip out.png #and back $ cmp in.png out.png $#no output - the images has no difference - theyre same $ identify in.png out.png in.png PNG 300x300 300x300+0+0 16-bit sRGB 1.65KB 0.000u 0:00.000 out.png[1] PNG 300x300 300x300+0+0 16-bit sRGB 1.65KB 0.000u 0:00.000 now trying this via eps . So: $ convert in.png -strip out2.eps #convert to eps $ convert out2.eps -strip out2.png #back

问题 From command line with imagemagick, you can use: convert dragon.gif -resize 64x64^ -gravity center -extent 64x64 fill_crop_dragon.gif to resize and then crop an image so that it fills the area as much as possible. How do I do this from Perl's Image::Magick? 回答1: #!/usr/bin/perl use strict; use warnings; use Image::Magick; my $image = Image::Magick->new; $image->read('test.jpg'); $image->Set( Gravity => 'Center' ); $image->Resize( geometry => '64x64' ); $image->Extent( geometry => '64x64' );

问题 What would be the simple process that would gives an array of the colors contained in an image ? 回答1: ImageMagick's "convert" command can generate a histogram. $ convert image.png -define histogram:unique-colors=true -format %c histogram:info:- 19557: ( 0, 0, 0) #000000 gray(0,0,0) 1727: ( 1, 1, 1) #010101 gray(1,1,1) 2868: ( 2, 2, 2) #020202 gray(2,2,2) 2066: ( 3, 3, 3) #030303 gray(3,3,3) 1525: ( 4, 4, 4) #040404 gray(4,4,4) . . . Depending on your language of choice and how you want the

问题 I am using ImageMagick to resize image resolution by using below command-line option convert abc.png -set units PixelsPerInch -density 75 abc_a.png I am in need of this: if any images has more than 300 width OR more than 100 height, I want to convert it to width 300 width and 100 height, with changing above dpi (i.e. 75dpi). Can any one help me on this? 回答1: If you are on Linux/OSX, you can get the image dimensions like this: identify -format "%w %h" input.jpg So, if you want the width and

问题 So I'm working on a way to extract dominant colors as perceived by humans from an image. As an example, here's a photo: https://500px.com/photo/63897015/looking-out-for-her-kittens-by-daniel-paulsson Most humans would think the 'dominant' color is that piercing azure of the eyes. Using standard quantization, however, that blue disappears completely when you drop below 16 colors or so. The eyes only take up 0.2% of the canvas, so going for the average doesn't work at all. Project Details : I'm

问题 I found several questions with answers on how to create a video from images. I setup two of them and was able to produce the videos correctly. I tried the following: ImageMagick convert -delay 100 -quality 75 photo1.jpg photo2.jpg movie.mpg FFMPEG ffmpeg -r 10 -b 1800 -i photo1.jpg photo2.jpg movie.mpg The end result is the video displaying images with timing, no effects. I looking to learn how they add a Fade In and Fade Out Transition between those images. 回答1: I doubt this can be done by