Image Optimization¶

This article explains how to quickly convert a PNG image format to a JPG file format using ImageMagick, a command line tool for editing photos.

Image Format Conversion¶

The following code will convert a PNG into a JPG, which is a compressed image format and more optimized for use on a website.

mogrify -format jpg studio.png

Image Compression¶

The following code will compress the input image by 50% in quality.

convert studio.jpg -quality 50% studio-web.jpg

Results¶

The results below, shown on my computer show the original image file (PNG) was 1.5MB in size, while the final optimized image file (JPG, 50%) is 67KB.

Image%20Optimization%209b5629080325438ab491f91f0f7838a9/Untitled.png

# compress all JPGs to quality 50% width 1000:
      mogrify -quality 50% -resize 1000 *.jpg

Image Manipulation¶

Scale image size: 1000px should be enough.

Compression: 50% (more agressive for web)

PNGs are uncompressed (pixel accuracy)

JPGs are compressed (human viewable)

Last update: May 7, 2021