#Imagemagick rotate how to#
#Imagemagick rotate pdf#

Use a multi-stage algorithm to detect a wide range of edges in the imageĬlip along the first path from the 8BIM profileĬontrast limited adaptive histogram equalization Improve brightness / contrast of the image Reduce image noise and reduce detail levels Simulate a scene at nighttime in the moonlight Non-linear, edge-preserving, and noise-reducing smoothing filterįorce all pixels below the threshold into black Transparent, extract, background, or shape the alpha channelĪutomagically adjust gamma level of imageĪutomagically adjust color levels of image On, activate, off, deactivate, set, opaque, copy', Join images into a single multi-image file OptionĪdaptively blur pixels decrease effect near edgesĪdaptively resize image with data dependent triangulation.Īdaptively sharpen pixels increase effect near edges

Click on an option to get more details about how that option works. The mogrify command recognizes these options. You can find additional examples of using mogrify in Examples of ImageMagick Usage. They are copies of their respective PNG images except are stored in the JPEG image format. Here image files 1.png, 2.png, etc., are left untouched and files 1.jpg, 2.jpg, etc., are created. You can resize all your JPEG images in a folder to a maximum dimension of 256x256 with this command: magick mogrify -resize 256x256 *.jpgįinally, we convert all our PNG images in a folder to the JPEG format: magick mogrify -format jpg *.png Rose: magick mogrify -resize 50% rose.jpg To get started, let's reduce the size of our We list a few examples of the mogrify command here to illustrate its usefulness and ease of use.

#Imagemagick rotate how to#

See Command Line Processing for advice on how to structure your mogrify command or see below for sample usages of the command. This tool is similar to magick except that the original image file is overwritten (unless you change the file suffix with the -format option) with any changes you request.

#Imagemagick rotate pdf#

Last example: we want convert image to PDF file, we also want to make it as as big as possible on A4 page – we must rotate that image if needed and also use white background.Use the magick mogrify program to resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. convert INPUT_FILE -gravity center -extent 640x480 OUTPUT_FILE The command will make 640×480 px file with this small image in center. We can also just expand image “workspace”. Hard to exmplain, but it’s very important option – with gravity option we can set postion of other elements on image (text, other images, etc): // Put image in center and make background whiteĬonvert INPUT_FILE -gravity center -background white OUTPUT_FILE Expand workspace: Rotate only if height value is higher than widthĬonvert INPUT_FILE -rotate '+90 OUTPUT_FILE Set gravity Rotate only if width value is higher than heightĬonvert INPUT_FILE -rotate '+90>' OUTPUT_FILE We can rotate images using degrees, but also use conditional rotate – only when height is higher than width or vice versa: // Rotate 90 degreesĬonvert INPUT_FILE -rotate '+90' OUTPUT_FILE We can easily create thumbnails with max-size using convert: // Max 100px widthĬonvert INPUT_FILE -thumbnail 100x OUTPUT_FILEĬonvert INPUT_FILE -thumbnail x100 OUTPUT_FILEĬonvert INPUT_FILE -thumbnail 100x100 OUTPUT_FILE Rotation (and conditional rotation) We can still forcr output format and save file with custom name: convert INPUT_FILE some-other-commands jpg:OUTPU_FILEĬonvert INPUT_FILE some-other-commands png:OUTPU_FILEĬonvert INPUT_FILE some-other-commands pdf:OUTPU_FILE Create thumbnails We don’t want to use alpha channel when we create thumbnails, so it’s nice idea to remove transparency: convert INPUT_FILE -alpha remove OUTPUT_FILE Force output file formatĬonvert always tries detect output format based on name, but sometimes it’s wrong or we just don’t want to use extensions. how detect rotation? It’s simple, you can just remove orientation flag: convert INPUT_FILE -auto-orient OUTPUT_FILE Remove transarency You will don’ see it in image browsers but it can be very frustating.

Phone images can have wrong image orientation – an example is photo form iPhone: good on computer, but 90 degree rotated after upload and display in user browser. Today I have some useful convert commands – it’s “list to remember” for me, but maybe also you will find someting nice? This post is short, because I paste only commands and very short description. Better option is to use external libs like convert (ImageMagick) and Ghostscript. Of course we can use native PHP functions, but it’s very slow.

Prepare them to display after user upload, prepare for database, fix dimensions or many other things. I must sometimes modify images and PDF documents in PHP.