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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I am creating thumbnails from much larger images and have been using this command successfully for some time:. I also do some other processing that is not relevant to the question.
I realized that this does not adjust the resolution at all, so if I use a dpi image, it ends up displaying really small on some devices. I want to resample it to 72×72 so I have been trying with this command:. And expected the 64×64 image at dpi to be resampled to a 64×64 image at 72dpi, but instead, I am getting a very funny size and density. So, the question is: What am I doing wrong and how can I fix it so converf end result is a 64×64 cropped thumbnail image at 72dpi?
Have you taken a look at the general thumbnail section of the ImageMagick Usage site? The examples there typically use the thumbnail option. From Generate Thumbnails in General:.
This not only resizes the image, but strips any and all profile and comment information that may be present cinvert the original JPEG image. Also as it uses the “-sample” resize operator for the initial downsizing of the image, it is reasonably fast, and produces good results for small thumbnails. Are you putting some kind of border around these images?
As of IM v6. That is, the image is resized to completely fill and even overflow the pixel area given.
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Command-line Tools: Convert @ ImageMagick