Efficiently generating thumbnails with ImageMagick and convert

Question

I\'m looking to efficiently generate various sized thumbnails with ImageMagick\'s convert utility in Python. Some of my image files are quite large (~15MB JPGs).

One

Answer 1

For my point of view, and after testing, resizing 1024x768 to 800x600 is bad for rescaling algorithm. The next resize are more easier, because of multiple of integer (2).

So, for quality reason, I personnaly thing, this is better :

convert sample_image.jpg -resize 1024x768  sample_image-1024x768.jpg
convert sample_image.jpg -resize 800x600   sample_image-800x600.jpg
convert sample_image-800x600.jpg   -resize 400x300   sample_image-400x300.jpg
convert sample_image-400x300.jpg   -resize 200x150   sample_image-200x150.jpg