![]() ![]() ![]() A bunch of tools out there do this, including GD and GraphicsMagick, but ImageMagick strikes a good balance between power and availability in hosting environments. This is where automated image resizing comes in handy. But what about a large website with a lot of images? An online store, for example, might have hundreds or thousands of image assets, and having to create different sizes of each of these is an enormous task. Responsive images to the rescue! Right? Well, yes, but first we have to generate our responsive image assets, and we have to make sure those assets look good and have a small enough footprint to improve the website’s performance.įor a very small website, saving a few different sizes of each image directly in our image editor is trivial - Photoshop even provides a handy “Save for Web” option that keeps file sizes low. (Image: HTTP Archive) ( View large version) The average web page is 2,099 KB, 1,310 KB of which comes from images. Improving web performance and giving a better experience to our users is our job as developers and designers. Even on a fast connection, a 2 MB website can wreak havoc on your users’ data plans and cost them real money. At the same time, millions of people are accessing the Internet on 3G-or-worse connections that make a 2 MB website a horror show to use. You need both ImageMagick and GraphicsMagick installed on your system to run the tests.The average web page is about 2 MB in size, and about two thirds of that weight is from images. Var parallel = require("concurrent-transform") The value that you want the image to be scaled to. Can be used for layered formats such as PNG. See gm background documentationĬombines image layers into one. Possible values: none to keep transparency, beige to set beige background, #888 for gray.ĭefine background color (default is white), for example when converting SVG images to PNGs. Set to true when using ImageMagick instead of GraphicsMagick. For details look for parameter -interlace with the type value set to "Line" in the gm profile documentation. Set to true to create interlaced images (scanline interlacing) from PNG, GIF or JPEG files (also known as "progressive" JPEG). For details look for parameter +profile "*" in the gm profile documentation. Therefore this is probably wanted in cases where thumbnails are generated for web preview purposes. untouched camera data or images optimized for print this may decrease image size drastically. Set to true to enforce removal of all embedded profile data like icc, exif, iptc, xmp and so on. Set to true to apply a slight unsharp mask after resizing. Catrom is very good for reduction, while hermite is good for enlargement). Set the filter to use when resizing (e.g. Possible values: Point, Box, Triangle, Hermite, Hanning, Hamming, Blackman, Gaussian, Quadratic, Cubic, Catrom, Mitchell, Lanczos, Bessel, Sinc Override the output format of the processed file. Ranges from 0 (really bad) to 1 (almost lossless). Doesn't have any effect, if options.crop is false.ĭetermines the output quality of the resized image. ![]() When cropping images this sets the image gravity. Possible values: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast If set to false (default), image will be copied instead of resized if it would be upscaled by resizing.ĭetermines whether images will be cropped after resizing to exactly match options.width and options.height. Default value: 0 (only if height is defined)Ī number value that is passed as pixel or percentage value to imagemagick.ĭefault value: 0 (only if width is defined)ĭetermines whether images will be upscaled. ![]()
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