Hello, I have a script that runs convert from the command line to resample a large number of images to 72 dpi to make them more web friendly. -resize x+20+30 (like the -scale and -sample examples below) converts an input to an output image which has the pixel dimensions of x A protip by asbigger about resize, bash, image-magick, magick, and size-in- pixels.

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However there are reports of some version where this may have been the bottom-right, or it may imagwmagick even been slightly variable due to bugs.

Resizing or Scaling — IM v6 Examples

ImageMagick can apply a variety of effects to an image. That when working with colors that change between blue-yellow and red-green.

Otherwise use the older Resizing to Fill a Given Space technique below. ImageMagick can quickly rotate an image. It’s very fast 2-pass filtering technique, is limited to orthogonally aligned pixel scaling, and a integer number of pixels in the final result.

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I’ve even tried running -density 72×72 to specify the new density, but that doesn’t seem to work either. You can also specify a specific width or height and ImageMagick will resize the image to that width or height while preserving the coonvert ratio. The Best Tech Newsletter Anywhere Imagsmagicksubscribers and get a daily digest of news, geek trivia, and our feature articles. My problem is that after resampling a bunch of images to use for the web, some of them resample, say that their resolution is now 72×72, and they appear the same size on a website.

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By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Others, however, appear much smaller online now, which I’m guessing is because the resolution has been altered, but the header in the jpg says that the image is of a much greater resolution.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued imagemagic of the website is subject to these policies.

First of all, thank you for the highly informative answer.

Resample Image to Size in Pixels With ImageMagick

Hopefully someone else will be able shed more light on this subject for you. This meant that in older versions of IM, image processing in LAB colorspace did not work, especially when a color involving both positive to negative values were involved.

It also completely ignores any current -filter setting. This is only a problem with non-linear colorspaces with mixed color-intensity channels, such as sRGB, or a sigmoidal colorspace.

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Resize Lanczos – Sinc. The examples there typically use imagemagiick thumbnail option. I had read mention of that but didn’t realize it affected any file touched by photoshop. Resize will no nothing at all if the resized image is the same size. Each illustration shows a different result, depending on the ‘fine details’ of the exact resize method: In versions of IM older than v6. Up until IM v6. This means that with a lower dpi, the image quality may not be as good, but will be smaller since there are fewer dots that need to be recorded.


That is not to say you can’t use it for diagrams, or line drawings, though for that type of image you may need imagemagck use some of the more advanced options we’ll look at later. This results in a slight color shift as opposed to a color being clipped as we saw earilier. I want to resample it to 72×72 conver I have been trying with this command:.

Usage questions are like “How do I use ImageMagick to create drop shadows? Not very useful and rarely used. The images get resampled but appear smaller in imwgemagick, which was what I thought resample was exactly supposed to keep from happening! It is not limited to just horizontal and vertical filtering. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Select all convert -density oldfile. I stripped out the header information, but still I have the same problem. The content of the image is then enlarged or more commonly shrunk to fit the desired size. Because of this older rrsample of ImageMagick would need to do the above colorspace correction with those colorspace names swapped.