mogrify

View documentation for the original command

$ tldr magick mogrify

mogrify [options] file...

-adaptive-blur geometry
    Adaptively blur the image.

-adaptive-resize geometry
    Adaptively resize the image with data dependent triangulation.

-adaptive-sharpen geometry
    Adaptively sharpen the image.

-alpha option
    Set the alpha channel option (e.g., 'set', 'off', 'remove').

-antialias
    Turn on/off antialiasing.

-background color
    Set the background color.

-blur geometry
    Reduce image noise and reduce detail levels.

-bordercolor color
    Set the border color.

-border geometry
    Add a border to the image.

-colors value
    Preferred number of colors in the image.

-comment string
    Attach a comment to the image.

-contrast
    Enhance or reduce the image contrast.

-crop geometry
    Crop the image.

-despeckle
    Reduce the speckle noise in an image.

-format type
    Specify the output image format (e.g., 'jpg', 'png', 'gif').

-gamma value
    Correct the image gamma.

-gravity type
    Define which direction to extend/place the image.

-resize geometry
    Resize the image.

-rotate degrees
    Rotate the image by the specified number of degrees.

-sharpen geometry
    Sharpen the image.

-strip
    Strip all profiles and text attributes from an image.

-thumbnail geometry
    Create a thumbnail of the image.

-trim
    Trim edges that are the background color.

-unsharp geometry
    Sharpen the image.

The mogrify command is part of the ImageMagick suite, a powerful command-line tool for image manipulation. Mogrify reads one or more image files and applies a series of operations (specified as command-line options) directly to the original image files.
Unlike 'convert', which creates new files, mogrify overwrites the input files, making it suitable for batch processing and applying transformations to large image sets. Use this command with caution, since it modifies the original images, and backups are recommended before usage. It offers a wide range of options for resizing, rotating, color correcting, applying filters, and more. It allows you to easily perform complex image processing tasks from the command line. It’s especially useful when dealing with a large number of images where manual editing would be impractical.

Mogrify overwrites the original image files. It's crucial to create backups before using this command to avoid data loss. Incorrect usage can lead to irreversible changes in your image data.

The geometry argument used in options like -resize, -crop, etc., follows a standard format: '[width]x[height][+xoff+yoff][%][@]'. Width and height are dimensions, xoff and yoff are offsets, % represents percentage scaling, and @ indicates the area is in megabytes.

When using '-format', be aware of compression and feature support of each file format. Converting a JPEG to a PNG will likely result in a larger file size, while converting a PNG to a JPEG may introduce compression artifacts. Also, convert from formats which support animation/layers (like GIF and TIFF) to JPG is destructive.

Mogrify has been a core part of the ImageMagick suite since its early development.
ImageMagick was first released in 1990 and has evolved over the years to become a robust and versatile image processing tool. Mogrify's functionality, specifically in-place modification, was a key feature early on, allowing for efficient batch processing where creating copies was unnecessary.

convert(1), identify(1), composite(1)