How can I get the difference between two images? I have the original image. Someone has written on an exact duplicate of the original image. Now, I need to compare the original to the written on image and extract just the writing in image format. Example: I have a picture of a house. Someone took … Read more
I get the error shown below when attempting to install the rmagick gem. I am on Snowleopard 10.6 using RVM, Ruby 1.9.2-head and Rails 3.05. Responses to similar questions recommended installing ImageMagick, which I successfully did. Other suggested installing the “libmagick9-dev library”, however, I can not figure out how to do this. I’m a new … Read more
I want to compress a JPG image file with ImageMagick but can’t get much difference in size. By default the output size is bigger than the input. I don’t know why, but after adding some +profile options and setting down the quality I can get an smaller size but still similar to original. The input … Read more
I want to create a captcha pic by use convert from ImageMagick. And I follow this, but there are some problem . Input In my linux shell: convert -background white -fill black -font FreeSerif-Bold -pointsize 36 label:’adfgh’ ./test.png The Error is: convert:not authorized adfgh @ error/constitute.c/ReadImage/453. convert:missing an image filename ./test.png @ error/convert.c/ConvertImageCommand/3015 My ImageMagick: … Read more
I’ve got some PNG images with transparency, and I need to create versions with the image layer composed onto a white background. I’ve tried various things with Image Magick “convert” operations, but either nothing happens at all or I get an error. I don’t want to go to an intermediate JPG form because I don’t … Read more
I’m trying to use the command line program convert to take a PDF into an image (JPEG or PNG). Here is one of the PDFs that I’m trying to convert. I want the program to trim off the excess white-space and return a high enough quality image that the superscripts can be read with ease. … Read more
I have a SVG file that has a defined size of 16×16. When I use ImageMagick’s convert program to convert it into a PNG, then I get a 16×16 pixel PNG which is way too small: convert test.svg test.png I need to specify the pixel size of the output PNG. -size parameter seems to be … Read more
The Imagemagick security policy seems to be not allowing me perform this conversion from pdf to png. Converting other extensions seem to be working, just not from pdf. I haven’t changed any of the imagemagick settings since I installed it… I am using Arch Linux, if the OS matters. user@machine $ convert -density 300 -depth … Read more
