![]() However, using the – resize options we have covered, it is, of course, perfectly feasible to enlarge our image. ![]() To conclude this section, typically, the most common way to change the size of an image is to shrink it to fit the desired size. Consequently, the actual scale may not exactly match the scaling factor we provide, but it will be very close. This will scale the image by the amount specified: convert flower_original.jpeg -resize 50% half_flower.jpegįor most of us, this type of scaling will be perfectly fine, but we should note that the final pixel size of the image will be rounded to the nearest integer. Similarly, we can also specify a percentage value when using the resize option. This means you can also use: convert -size 800x800 canvas:white white. Instead of simply scaling down an image with CSS, I should be generating a thumbnail and serving that up instead. Instead of simply scaling down an image with CSS, I should be generating a thumbnail and serving that up instead. ImageMagick is loaded with options but the syntax to generate a thumbnails is dead easy: convert billboard.png -trim -resize 32x32 thumbnail.png. In this example, we fit our original flower image into a smaller square box 64×64 pixels in size: 2 Answers Sorted by: 75 White background convert -size 800x800 xc:white white.png xc: used to mean 'X Constant Image' but now is just a shorthand for canvas. ImageMagick is loaded with options but the syntax to generate a thumbnails is dead easy: convert billboard.png -trim -resize 32x32 thumbnail.png. We can build on the previous example by using the -resize option of the convert command: convert flower_original.jpeg -resize 64圆4 flower_64圆4.jpeg ![]() Another typical operation is image resizing.
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