imagemagick-convert

问题 I want to convert multi page pdfs into single page images efficiently. I already know how to do this one page at a time with imagemagick. For example, convert x.pdf[2] x3.jpg will give me the 3rd page of the pdf as an image. So if I figure out how many pages are in the pdf using identify then I can loop through and convert all pages in the pdf to images. This method can however take a while. For example a 15 page pdf could take anywhere between 15-30 seconds. According to answers that I have

问题 I'm looking to efficiently generate various sized thumbnails with ImageMagick's convert utility in Python. Some of my image files are quite large (~15MB JPGs). One way I could do it would be to take the full-sized image, and to generate the various thumbnails from the full-sized image, as follows: convert sample_image.jpg -resize 1024x768 sample_image-1024x768.jpg convert sample_image.jpg -resize 800x600 sample_image-800x600.jpg convert sample_image.jpg -resize 400x300 sample_image-400x300

问题 I'm looking to efficiently generate various sized thumbnails with ImageMagick's convert utility in Python. Some of my image files are quite large (~15MB JPGs). One way I could do it would be to take the full-sized image, and to generate the various thumbnails from the full-sized image, as follows: convert sample_image.jpg -resize 1024x768 sample_image-1024x768.jpg convert sample_image.jpg -resize 800x600 sample_image-800x600.jpg convert sample_image.jpg -resize 400x300 sample_image-400x300

问题 How can I crop a big JPG and extract a small portion of it? The problem is main JPGs are so big and I can't load all of it in memory. I used convert.exe from ImageMagick, but it's not working properly on all versions of windows and I prefer some C# method instead of a standalone exe. 回答1: There are a couple of possibilities. You could use stream which is part of ImageMagick, or vips . Let's do stream first. I can make a large (10,000x5,000) JPEG like this: convert -size 10000x5000 xc:blue

问题 Been trying for awhile now trying to get a shadow using the following code: using (MagickImage image = new MagickImage(@"C:\Users\David\Pictures\YnTf9.png")) { MagickImage _shadow = new MagickImage(bitmap); using (IMagickImage backgroundImg = image.Clone()) { backgroundImg.Blur(0, 5); backgroundImg.Crop(400, 300, Gravity.Center); backgroundImg.RePage(); image.Resize(0, 300); _shadow.Resize(0, 300); _shadow.Shadow(10, 10, 0.8, (Percentage)80, MagickColor.FromRgb(0, 0, 0)); backgroundImg

问题 I've got two tiff stacks with time-lapse data corresponding to different channels acquired in a microscopy experiment. I'd like to merge them into a single stack with two channels. Both stacks are 16-bit greyscale. When I use: convert stack1.tiff stack2.tiff stack_merged.tiff I get a single but concatenated file with two stacks one after another. Links to file 1 and file 2. 回答1: I think you need something like this: #!/bin/bash # Get index of last frame in TIFF image last=$(convert stack1.tif

问题 I want to create a sample YUV422 Frame on Ubuntu from any image so I can code a YUV422 to RGB888 function for the sake of learning. I'd really like to be able to use a trusted tool to create a sample and convert back to a jpeg. I've tried ImageMagick but am clearly doing something wrong: convert -size 640x480 -depth 24 test.jpg -colorspace YUV -size 640x480 -depth 16 -sampling-factor 4:2:2 tmp422.yuv convert -colorspace YUV -size 640x480 -depth 16 -sampling-factor 4:2:2 tmp422.yuv -size

问题 I have a cmyk pdf that I am trying to convert to a RGB jpeg or png file but have the colors stay pretty close to what the CMYK version is (compared to how photoshop does it) I am trying the following command but the colors change drastically from a red color to almost bright neon red and so on. Here is the command convert cmykpdf.pdf +profile icc -profile AdobeRGB1998.icc -colorspace sRGB jpegtesting.jpg Any ideas? or thoughts on how to do this. I tried saving it as a PNG also and same issue

问题 Installed ImageMagick-7.0.4-7-Q16-x64-dll.exe for resolving the issue of Tesseract facing problems with smaller font explained in this Stackoverflow question Is there any way to improve tesseract OCR with small fonts? I ran the following convert command. But it still says invalid parameter. C:\Users\rt\Desktop\Sample_Files>convert -resize 400% image5.jpg image5out.jpg Invalid Parameter - 400% and when I ran this C:\Users\rt\Desktop\Sample_Files>where convert.exe C:\Windows\System32\convert

问题 I have a script that does a bunch of image processing. So far it runs sequentially, uses only one core and takes forever. I have four cores at hand. I want to run four of these commands at the same time. To make this happen, I need to put the commands in an array. These are the original commands: convert.exe -density 200 -quality 80 -delete 0 -scene 1 C:\Users\mles\Desktop\ta2014\v33_1_21_Northland.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg convert.exe -density 200 -quality 80 -delete 0 -scene