Recommendation for compressing JPG files with ImageMagick

by

I use always:

  • quality in 85
  • progressive (comprobed compression)
  • a very tiny gausssian blur to optimize the size (0.05 or 0.5 of radius) depends on the quality and size of the picture, this notably optimizes the size of the jpeg.
  • Strip any comment or EXIF metadata

in imagemagick should be

convert -strip -interlace Plane -gaussian-blur 0.05 -quality 85% source.jpg result.jpg

or in the newer version:

magick source.jpg -strip -interlace Plane -gaussian-blur 0.05 -quality 85% result.jpg

Source.

From @Fordi in the comments (Don’t forget to upvote him if you like this):
If you dislike blurring, use -sampling-factor 4:2:0 instead. What this does is reduce the chroma channel’s resolution to half, without messing with the luminance resolution that your eyes latch onto. If you want better fidelity in the conversion, you can get a slight improvement without an increase in filesize by specifying -define jpeg:dct-method=float – that is, use the more accurate floating point discrete cosine transform, rather than the default fast integer version.

More Related Contents:

  1. why font list is empty for imagemagick?
  2. Converting RGB to grayscale/intensity
  3. Is there a way to detect if an image is blurry? [closed]
  4. A guide to convert_imageset.cpp
  5. Converting BMP image to set of instructions for a plotter?
  6. How can I sharpen an image in OpenCV?
  7. Face recognition Library [closed]
  8. How do I add exif data to an image?
  9. Extracting DCT coefficients from encoded images and video
  10. Remove EXIF data from JPG using PHP
  11. Methods to vectorise histogram in SIMD?
  12. Automatic calculation of low and high thresholds for the Canny operation in opencv
  13. OpenCV: How-to calculate distance between camera and object using image?
  14. Window width and center calculation of DICOM image
  15. How can I do these image processing tasks using OpenGL ES 2.0 shaders?
  16. How to get the real life size of an object from an image, when not knowing the distance between object and the camera?
  17. Filling holes inside a binary object
  18. Reshaping noisy coin into a circle form
  19. Matching image to images collection
  20. Detect main colors in an image with PHP
  21. Pixel access in OpenCV 2.2
  22. Crop black edges with OpenCV
  23. How to fill OpenCV image with one solid color?
  24. Comparing two histograms
  25. Sobel filter kernel of large size
  26. How to change color of image in JavaFX
  27. Connected-component labeling with ImageMagick
  28. Change specific RGB color pixels to another color, in image file
  29. How to convert image to black and white using Java
  30. How to find corners on a Image using OpenCv

Leave a Comment